The FLASH HDF5 structure

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== Contents ==

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== General information about HDF5 ==

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HDF5 is a data format maintained by the HDF group. For detailed general information see [[here~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:https://portal.hdfgroup.org/display/support||shape="rect"]]

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To download the HDF5 Viewer click [[here~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:https://portal.hdfgroup.org/display/support/Download+HDFView||shape="rect"]]

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For use on the DESY Maxwell or PAL (max-fsc or pal) **hdfview** is available in the xray module :

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{{code language="none"}}> module load xray{{/code}}

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{{code language="none"}}> hdfview{{/code}}

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[[Contents>>doc:||anchor="Contents"]]

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== The new (starting 2021) HDF5 format ==

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FLASH provides a conversion of its data acquisition (DAQ) to the commonly used [[HDF5>>url:https://www.hdfgroup.org/solutions/hdf5/||shape="rect"]] format. Correlated data are mapped by a primary index called **train ID**. Every data set has an individual index of train IDs to identify the data even when data are missing or deviate in update rate.If the data set of choice contains gaps, users have to decide how to treat missing values. DAQ channels are spread across various files with one file name pattern for each DAQ. This means users have to assemble data from different files if necessary.

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The hierarchy is realized using a human readable named HDF tree with each DAQ channel containing the data sets "//value//" and "//index//". Additionally, the HDF group //zraw// contains a tree of the original DAQ channel names.

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Reference implementation, which follows the concept of Python libraries like Pandas, Xarray, or Dask, is given below.

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== Comparison to FLASH's deprecated HDF formats ==

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Before 2021, FLASH provided two different HDF formats formally known as //near-online// and //offline// HDF files.

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All data sets were aligned by the same global index by filling in missing data. Fast DAQ channels (pulse synchronous data - update 10 Hz) are filled in by NaN or 0, slow channels (not pulse synchronous data - update e.g. 1 Hz ) are interpolated by the DAQs libraries, by keeping the value constant up to the next change.

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While the near-online HDF files were converted live during the beamtime, the offline HDF files were manually compiled weeks/months later. Near-online HDF files were used by a provided API [[BeamtimeDaqAccess>>url:https://confluence.desy.de/display/FLASHUSER/Near-Online+data+analysis#Near-Onlinedataanalysis-BriefUserGuidetoBeamtimeDAQAccess||shape="rect"]], which also searches for DAQ channels in files. With assembled files "by run", all DAQ channels were existing in the same HDF file. While shorter runs usually fitted into one file, longer runs still had to be aggregated over several files. The creation of the assembled type of files still involves the use of fairly unstable DAQ Mex-functions As the environment required for using the Mex-functions is already deprecated, its continued existence is uncertain.

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The HDF hierarchy is almost identical in all formats. While in the the recent format each DAQ channel contains the data sets "value" and "index", the deprecated format had one data set for each DAQ channel. The deprecated formats supplies no time axis parameters for spectra data types.

=== HDF excerpt: ===

* ADC data as example for **fast** **data** (10 Hz): [[image:attach:image2020-11-16_15-26-28.png||height="250"]]

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* The //average// FEL pulse energy as example for the **slow** **data** (different e.g. 1 Hz):[[image:attach:image2020-11-16_15-31-45.png||height="250"]]

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( every 10th train ID is listed in the HDF group "index")

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* (((

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//zraw// group contains the **original DAQ (DOOCS) names[[image:attach:image2020-11-16_16-26-3.png||thumbnail="true" height="250"]]**

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)))

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of the properties saved in the DESY internal raw format. (For experts)

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=== Reference implementation (Python) ===

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[[~[~[image:attach:binder_badge.png~|~|thumbnail="true" width="120"~]~]>>url:https://mybinder.org/v2/git/https%3A%2F%2Fgitlab.desy.de%2Fchristopher.passow%2Fflash-daq-hdf/master||shape="rect"]]

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(% class="Object" %)[[https:~~/~~/gitlab.desy.de/christopher.passow/flash-daq-hdf>>url:https://gitlab.desy.de/christopher.passow/flash-daq-hdf||shape="rect"]]

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== The discontinued (till 2021) FLASH HDF5 structure ==

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The photon diagnostic, electron diagnostic and beamline information as well as the information about the pump-probe laser and the infrastructure offered for users (GHz/MHz ADCs) can be included in one HDF5 file which is organized according to train IDs. The general structure is:

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* Electron Diagnostic

* Photon Diagnostics

* Beamlines

* Experiment

* Timing

[[image:attach:HDF5_structure.jpg||height="400"]]

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A detailed description of (most) channels can be found in the lower part of the hdf5 viewer:

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[[image:attach:HDF5_structure_desc.jpg||thumbnail="true" height="250"]]

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[[Contents>>doc:||anchor="Contents"]]

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=== HDF5 example files (old format) ===

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Here we have a few HDF5 samples (User data combined with Photon diagnostics data) from a few beamtimes showing the different kind options.

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[[image:attach:image2019-10-21_17-2-50.png||thumbnail="true" width="300"]] [[download HDF5 (Images @ FL2)>>url:https://desycloud.desy.de/index.php/s/nyEgeCWJFC4gao2||shape="rect"]]

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[[~[~[image:attach:image2019-10-22_10-52-27.png~|~|thumbnail="true" width="300"~]~]download HDF5 (GHz ADC and OPIS @ FL2)>>url:https://desycloud.desy.de/index.php/s/AeA2kPNNnZgX95A||shape="rect"]]

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[[Contents>>doc:||anchor="Contents"]]

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== Most popular FLASH parameters and their names in HDF5, DOOCS and (raw) DAQ ==

The complete list for the relation between DOOCS names and HDF5 names for the recordable parameters can be found in [[DESY's Repository~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:https://stash.desy.de/projects/CS/repos/pah/browse/src/camp/data/channel2HdfName.dat||shape="rect"]].

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The most common and often used ones are summarized below:

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Note, the HDF group and data set names apply to our HDF tree version since vers. 0.3.0.

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=== FLASH1 ===

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==== Beamline info (FLASH1) ====

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{{code language="none"}}/FL1/Beamlines/Attenuator/pressure{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/GAS_DOSING/FL1.ATTENUATOR/PRESSURE{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/GAS_DOSING/FL1.ATTENUATOR/PRESSURE{{/code}}

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desc: set pressure in the gas attenuator

units: mbar

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{{code language="none"}}/FL1/Beamlines/BL/Fast shutter/open{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/ADC.SIS.FL1FS/BL.SHUTTER/CH00.TD{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/ADC.SIS.FL1FS/BL.SHUTTER{{/code}}

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desc: BL Beamline Fast shutter state

units: none

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{{code language="none"}}/FL1/Beamlines/PG/Fast shutter/open{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/ADC.SIS.FL1FS/PG.SHUTTER/CH00.TD{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/ADC.SIS.FL1FS/PG.SHUTTER{{/code}}

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desc: PG Beamline Fast shutter state

units: none

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{{code language="none"}}/FL1/Beamlines/BL/Filters/BL filter wheel/position filter 1{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.FEL/BLFILTERS1/FILTER1/FW.MOTOR.POS{{/code}}

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DAQ channel: {{code language="none"}}TTF2.FEL/BLFILTERS1/FILTER1/FW.MOTOR.POS{{/code}}

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desc: Position of the BL filter wheel 1 - to correlate with the filter material please look [[here>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]]

units: degree

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{{code language="none"}}/FL1/Beamlines/BL/Filters/BL filter wheel/position filter 2{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.FEL/BLFILTERS2/FILTER2/FW.MOTOR.POS{{/code}}

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DAQ channel: {{code language="none"}}TTF2.FEL/BLFILTERS2/FILTER2/FW.MOTOR.POS{{/code}}

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desc: Position of the BL filter wheel 2 - to correlate with the filter material please look [[here>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]]

units: degree

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{{code language="none"}}/FL1/Beamlines/PG/Filters/position filter 1{{/code}}

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//always saved (PBD)//

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DOOCS prop : = TTF2.FEL/BDAF1/BDA.F1/FW.MOTOR.POS=

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DAQ channel: {{code language="none"}}TTF2.FEL/BDAF1/BDA.F1/FW.MOTOR.POS{{/code}}

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desc: Position of the PG filter wheel 1

units: degree

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{{code language="none"}}/FL1/Beamlines/PG/Filters/position filter 2{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.FEL/BDAF2/BDA.F2/FW.MOTOR.POS{{/code}}

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DAQ channel: {{code language="none"}}TTF2.FEL/BDAF2/BDA.F2/FW.MOTOR.POS{{/code}}

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desc: Position of the PG filter wheel 2

units: degree

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{{code language="none"}}/FL1/Beamlines/PG/Filters/position filter 3{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.FEL/PGFILTERS/PGFILTERS/FW.MOTOR.POS{{/code}}

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DAQ channel: {{code language="none"}}TTF2.FEL/PGFILTERS/PGFILTERS/FW.MOTOR.POS{{/code}}

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desc: Position of the PG filter wheel 3

units: degree

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NOTE: Aperture positions in the beamline as well as the positions of the beam steering mirrors are also saved. For more Info contact your local contact

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[[Contents>>doc:||anchor="Contents"]]

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==== Photon Diagnostics SASE ([[GMD>>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/gmd_intensity_and_position/index_eng.html||shape="rect"]]) ====

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(% style="color: rgb(0,0,0);" %)**Discontinued GMD data recording / evaluation (VME + PhotonFlux ML server)**

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Average energy/energy tunnel{{/code}}

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//always saved (PBD)//

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(% style="color: rgb(0,0,0);" %)DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT04/VAL{{/code}} (%%)

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(% style="color: rgb(0,0,0);" %)DAQ channel: {{code language="none"}}PBD.PHFLUX/TUNNEL.ENPULSEIC{{/code}}(%%)

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desc : calibrated average SASE Energy/pulse measured in the TUNNEL upstream the gas attenuator (ion current)

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units : microJ

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT34/VAL{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHFLUX/TUNNEL.ENERGYPULSE.USER{{/code}}

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desc :Energy per pulse Tunnel (from e-) - the values are set to "0" if there was no SASE beam in the FEL

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units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision) **[[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel (raw){{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT14/VAL{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHFLUX/TUNNEL.ENERGYPULSE.FF{{/code}}

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desc :Energy per pulse Tunnel (from e-) - uncorrected values. There are also values saved if there was no beam ... just background noise

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units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision) **[[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Average energy/energy BDA{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT05/VAL{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHFLUX/BDA.ENPULSEIC{{/code}}

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desc : calibrated average SASE Energy/pulse measured in the BDA (in the experimental hall) after the attenuator (ion current)

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units : microJ

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Pulse resolved energy/energy BDA{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT35/VAL{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHFLUX/BDA.ENERGYPULSE.USER{{/code}}

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desc :Energy per pulse BDA (from e-) - the values are set to "0" if there was no SASE beam in the FEL

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units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision) **[[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Pulse resolved energy/energy BDA (raw){{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}TTF2.DAQ/PHFLUX/OUT15/VAL{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHFLUX/BDA.ENERGYPULSE.FF{{/code}}

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desc :Energy per pulse BDA (from e-) - uncorrected values. There are also values saved if there was no beam ... just background noise

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units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision)** [[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

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(% style="color: rgb(0,0,0);" %)**NEW (2021) GMD data recording / evaluation (MTCA, analog to FLASH2 and XFEL)**

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Average energy/energy tunnel{{/code}}

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//always saved (PBD)//

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(% style="color: rgb(0,0,0);" %)DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.PHOTONFLUX/FL1.TUNNEL/PHOTONFLUX.UJ{{/code}} (%%)

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(% style="color: rgb(0,0,0);" %)DAQ channel: {{code language="none"}}FLASH.FEL/XGM.PHOTONFLUX/FL1.TUNNEL/PHOTONFLUX.UJ{{/code}}

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desc : calibrated average SASE Energy/pulse measured in the TUNNEL upstream the gas attenuator

units : microJ

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel{{/code}}

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//always saved (PBD)//

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(% style="color: rgb(0,0,0);" %)DOOCS prop :

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{{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL1.TUNNEL/INTENSITY.TD{{/code}}DAQ channel: {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL1.TUNNEL/INTENSITY.TD{{/code}}

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desc : Energy per pulse measured in the Tunnel. In addition measurement errors and beam position are included for EACH pulse in the pulse train !! (see below)

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units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision)** [[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

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For every pulse in the pulse train the information is saved:

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1. **Intensity per pulse** (a.u. (more or less µJ ))

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1. Intensity per pulse (auxillary GMD) - not used

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1. Position horizontal (mm, for a single pulse the position information may be very noisy - talk to your local contact)

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1. Position vertical (mm, for a single pulse the position information may be very noisy - talk to your local contact)

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1. **Intensity per pulse sigma** (a.u. (more or less µJ ), (% style="color: rgb(0,0,0);" %)This parameter gives an indication of the error of the measurement of the pulse energy. This takes signal to noise, detector resolution, uncertainties in crossection etc into account. (it is NOT the measurement of the statistical fluctuation of the SASE pulses)(%%))

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1. Position horizontal sigma (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)

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1. Position vertical sigma (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)

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1. Combined warning and error flags

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The pulse energy and the error are plotted for the first bunch of the pulse trains saved in this

file

[[image:attach:image2021-2-9_10-51-6.png||height="250"]]

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All values for the GMD are also available for the** BDA GMD **which is located in the experimental hall down stream the gas attenuator. If the attenuator is on the ratio between BDA and Tunnel signal shows the attenuation. **BUT NOTE** that the filter units are downstream the GMD. So if filters are used this influence is NOT measured by the GMD BDA !

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Besides pulse energy the GMD also provides information about the beam position

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Beam position/position BDA horizontal{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.BDA/IX.POS{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.BDA/IX.POS{{/code}}

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desc :Beam position of the photon Beam determined by the GMD (BDA, x=horizontal)

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units : mm

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Beam position/position BDA vertical{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.BDA/IY.POS{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.BDA/IY.POS{{/code}}

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desc :Beam position of the photon Beam determined by the GMD (BDA, y=vertical)

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units : mm

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Beam position/position tunnel horizontal{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.TUNNEL/IX.POS{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.TUNNEL/IX.POS{{/code}}

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desc :Beam position of the photon Beam determined by the GMD (TUNNEL, x=horizontal)

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units : mm

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{{code language="none"}}/FL1/Photon Diagnostic/GMD/Beam position/position tunnel vertical{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.TUNNEL/IY.POS{{/code}}

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DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL1.TUNNEL/IY.POS{{/code}}

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desc :Beam position of the photon Beam determined by the GMD (TUNNEL, y=vertical)

units : mm

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==== Spectrometer (FLASH1) ====

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/Tunnelspectrometer/wavelength{{/code}}

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_always saved (when Spectrum is measured !!) (PBD) _

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DOOCS prop : {{code language="none"}}TTF2.EXP/PHOTONWL.ML/WAVE_LENGTH/VAL.TD{{/code}}

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DAQ channel: {{code language="none"}}PBD.PHOTONWL.ML/WAVE_LENGTH{{/code}}

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desc : XUV Spectrum measured with the "tunnel spectrometer"

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units :

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/Tunnelspectrometer/wavelength start value{{/code}}

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_always saved (when Spectrum is measured !!) (PBD) _

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DOOCS prop : {{code language="none"}}TTF2.EXP/PBD.PHOTONWL.ML/BSTART/VAL{{/code}}

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DAQ channel: {{code language="none"}}TTF2.EXP/PBD.PHOTONWL.ML/BSTART/VAL{{/code}}

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desc : start value (in nm) for the wavelength axis of the XUV Spectrum measured with the "tunnel spectrometer"

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units : nm

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/Tunnelspectrometer/wavelength increment{{/code}}

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_always saved (when Spectrum is measured !!) (PBD) _

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DOOCS prop : ==

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DAQ channel: ==

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desc : increment value (in nm) for each pixel for the wavelength axis of the XUV Spectrum measured with the "tunnel spectrometer"

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units : nm

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon energy{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: {{code language="none"}}PBD.PHOTONEN.ML/PHOTON_ENERGY{{/code}}

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desc : XUV Spectrum in eV measured with the "PG2 spectrometer"

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units :

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon energy start value{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: ==

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desc : start value (in eV) for the wavelength axis of the XUV Spectrum measured with the "PG2 spectrometer"

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units : eV

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon energy increment{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: ==

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desc : increment value (in eV) for each pixel for the wavelength axis of the XUV Spectrum measured with the "PG spectrometer"

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units : eV

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon wavelength{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: {{code language="none"}}PHOTONEN.ML/PHOTON_WAVE_LEN{{/code}}

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desc : XUV Spectrum in nm measured with the "PG2 spectrometer"

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units :

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon wavelength increment{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: ==

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desc : start value (in nm) for the wavelength axis of the XUV Spectrum measured with the "PG2 spectrometer"

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units : nm

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{{code language="none"}}/FL1/Photon Diagnostic/Wavelength/PG2 spectrometer/photon wavelength start value{{/code}}

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//saved on DEMAND (PBD spectrometer stream)//

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DOOCS prop : ==

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DAQ channel: ==

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desc : increment value (in nm) for each pixel for the wavelength axis of the XUV Spectrum measured with the "PG spectrometer"

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units : nm

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[[Contents>>doc:||anchor="Contents"]]

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==== Electron Beam properties (FLASH1) ====

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===== bunch charge =====

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{{code language="none"}}/FL1/Electron Diagnostic/Bunch charge/after undulator{{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.DIAG/TOROID.ML/12EXP/CHARGE.FLASH1{{/code}}

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DAQ channel: {{code language="none"}}FLASH.DIAG/TOROID/12EXP{{/code}}

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desc: electron bunch charge (FLASH1)

units: nC

=====

arrival time =====

{{code language="none"}}/FL1/Electron Diagnostic/BAM/4DBC3/electron bunch arrival time (low charge){{/code}}

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//always saved (PBD)//

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DOOCS prop : {{code language="none"}}FLASH.SDIAG/BAM/4DBC3/LOW_CHARGE_ARRIVAL_TIME{{/code}}

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DAQ channel: {{code language="none"}}FLASH.SDIAG/BAM.DAQ/4DBC3.LOW_CHARGE_ARRIVAL_TIME{{/code}}

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desc: Electron bunch arrival time measured with the BAM inside the accelerator - however shows a very good correlation to the arrivaltime of the XUV pulses in the experiment (pulse resolved data).

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units: ps (bigger numbers indicate later arrivaltime of the electrons)

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{{code language="none"}}/FL1/Electron Diagnostic/BAM/1SFELC/electron bunch arrival time (low charge){{/code}}

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//always saved (PBD)//

422

DOOCS prop : {{code language="none"}}FLASH.SDIAG/BAM/1SFELC/LOW_CHARGE_ARRIVAL_TIME{{/code}}

423

DAQ channel: {{code language="none"}}FLASH.SDIAG/BAM.DAQ/1SFELC.LOW_CHARGE_ARRIVAL_TIME{{/code}}

424

desc: Electron bunch arrival time measured with the BAM before the undulator (pulse resolved data). This one was newly installed in 2020.

425

units: ps (bigger numbers indicate later arrivaltime of the electrons)

426

427

428

* besides the arrivaltime from FLASH1 there is also the FLASH2/3 electron arrival time saved.In case of doubt ask your local contact

429

* [[Link a collection of papers related to the BAM and the analysis of pump-probe experiments >>doc:FLASHUSER.Additional helpful things.FLASH beamlines and instruments references.WebHome]]

430

* [[LINK to detailed infos from MSK (may only work inside DESY network~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:http://www.desy.de/~~mbock/pages/BAM_daq_channel_descriptions.html||shape="rect"]]

431

* a recent [[talk about the working principle of the BAM>>attach:BAM-basics and outlook-2018_DESY-template_16-9Format.pdf]]

\\

===== electron beam profile =====

437

438

{{code language="none"}}/FL1/Electron Diagnostic/Electron bunch profile/TDS profile{{/code}}

439

//always saved (PBD) - IF LOLA is ON and ACTIVATED in the PBD DAQ (talk to expert)//

440

DOOCS prop : {{code language="none"}}TTF2.DAQ/BEAM.PROF.ML/BEAM.PROF/OUT.PROF.CCCED{{/code}}

441

DAQ channel: {{code language="none"}}PBD.BEAM.PROF.ML/DAQ.OUT.PROF.CCCED{{/code}}

442

desc: temporal profile of electron bunch, y axis in Ampers (FLASH1)

units: pixel

\\

{{code language="none"}}/FL1/Electron Diagnostic/Electron bunch profile/Expert stuff/TDS calibration constant{{/code}}

447

//always saved (PBD) - IF LOLA is ON and ACTIVATED in the PBD DAQ (talk to expert)//

448

DOOCS prop : {{code language="none"}}TTF2.DAQ/BEAM.PROF.ML/BEAM.PROF/CALIB.CONST.T{{/code}}

449

DAQ channel: = PBD.BEAM.PROF.ML/CCT=

450

desc: TDS calibration constant for the x-axis of the profiles: fs per pixel

units: fs per pixel

\\

{{code language="none"}}/FL1/Electron Diagnostic/Electron bunch profile/TDS profile width rms{{/code}}

455

//always saved (PBD) - IF LOLA is ON and ACTIVATED in the PBD DAQ (talk to expert)//

456

DOOCS prop : {{code language="none"}}TTF2.DAQ/BEAM.PROF.ML/BEAM.PROF/SOWS.W.CCTED{{/code}}

457

DAQ channel: {{code language="none"}}PBD.BEAM.PROF.ML/PROFWIDTHCCTED{{/code}}

458

desc: rms pulse width of the measures TDS electron bunch profile

459

units: fs

460

461

===== electron bunch energy =====

462

463

{{code language="none"}}/FL1/Electron Diagnostic/Electron energy/average electron energy{{/code}}

464

//always saved (PBD)//

465

DOOCS prop : {{code language="none"}}TTF2.DAQ/ENERGY.DOGLEG/E_INTRA_MEAN/VAL{{/code}}

466

DAQ channel: {{code language="none"}}PBD.ENERGY.DOGLEG/E_MEAN{{/code}}

467

desc: electron bunch energy (average over the bunch train)

468

units: (% class="twikiNewLink" %)MeV(%%)

469

\\

470

471

{{code language="none"}}/FL1/Electron Diagnostic/Electron energy/pulse resolved energy{{/code}}

472

//always saved (PBD)//

473

DOOCS prop : {{code language="none"}}TTF2.DAQ/ENERGY.DOGLEG/E_SPECT/VAL.TD{{/code}}

474

DAQ channel: {{code language="none"}}PBD.ENERGY.DOGLEG/E_SPECT{{/code}}

475

desc: electron bunch energy bunch resolved

476

units: (% class="twikiNewLink" %)MeV

\\

{{code language="none"}}/FL1/Electron Diagnostic/Electron energy/wavelength bunch train average{{/code}}

481

//always saved (PBD)//

482

DOOCS prop : {{code language="none"}}TTF2.DAQ/ENERGY.DOGLEG/LAMBDA_MEAN/VAL{{/code}}

483

DAQ channel: {{code language="none"}}PBD.ENERGY.DOGLEG/LAMBDA_MEAN{{/code}}

484

desc: Wavelength calculated by the electron bunch energy (average over the bunch train) (FLASH1)

units: nm

\\

[[Contents>>doc:||anchor="Contents"]]

\\

==== Timing information, rep rate etc. (FLASH1) ====

493

494

===== bunch repetition rate =====

495

496

{{code language="none"}}/FL1/Timing/repetition rate{{/code}}

497

//always saved (PBD)//

498

DOOCS prop : {{code language="none"}}FLASH.DIAG/TIMER/FLASHCPUTIME1.0/REP_RATE_KHZ.1{{/code}}

499

DAQ channel: {{code language="none"}}TTF2.UTIL/LASER.CONTROL/GUN/PULSE_FREQ{{/code}}

500

desc: repetition rate of the bunches / pulses within the burst (FLASH1)

units: kHz

\\

===== set number of pulses =====

505

506

{{code language="none"}}/FL1/Timing/set number of bunches{{/code}}

507

//always saved (PBD)//

508

DOOCS prop : {{code language="none"}}FLASH.DIAG/TOROID.ML/3GUN/NUMBEROFBUNCHES.FLASH1{{/code}}

509

DAQ channel: {{code language="none"}}TTF2.UTIL/LASER.CONTROL/GUN/PULSE_NUM{{/code}}

510

desc: Number of pulses set at the gun (FLASH1)

511

units:

512

513

===== actual number of pulses =====

514

515

{{code language="none"}}/FL1/Timing/actual number of bunches{{/code}}

516

//always saved (PBD)//

517

DOOCS prop : {{code language="none"}}FLASH.DIAG/TOROID.ML/12EXP/NUMBEROFBUNCHES.FLASH1{{/code}}

518

DAQ channel: {{code language="none"}}TTF2.DIAG/PBD.TOROID.ML/12EXP{{/code}}

519

desc: Number of bunches measured BEHIND the undulator. If pulses are used for diagnostic of the protection system of the accelerator limits the number of bunches to be accelerated this is the actual number that created XUV radiation.The number is calculated by the DAQ middle layer server, (FLASH1)

units:

\\

===== actual pulse pattern recorded after the undulator =====

524

525

{{code language="none"}}/FL1/Timing/Bunch pattern/pattern after undulator{{/code}}

526

//always saved (PBD)//

527

DOOCS prop : {{code language="none"}}TTF2.DIAG/PBD.TOROID.ML/12EXP/CHARGE.TD{{/code}}

528

DAQ channel: {{code language="none"}}TTF2.DIAG/PBD.TOROID.ML/12EXP{{/code}}

529

desc: The bunch pattern as function of time in a burst recorded by toroide diagnostic BEHIND the undulator. (FLASH1)

units:

\\

===== Train ID =====

{{code language="none"}}/Timing/train ID{{/code}}

536

//always saved (PBD)//

537

DOOCS prop : {{code language="none"}}none{{/code}}

538

DAQ channel: {{code language="none"}}none{{/code}}

539

desc: Each 10 Hz burst has its unique train ID. For the HDF5 data set the ID is the same for all parameters with the same index (note camera images may be shifted by 1 ID - talk to the experts !)

units:

\\

===== Train time =====

544

545

{{code language="none"}}/Timing/train time{{/code}}

546

desc:Local time as array of day, hour, minute, second, and centisecond. This data set is meant for visualization purposes only. For correlations use the train ID or the Unix time of the time stamp

units: d h min s cs

\\

{{code language="none"}}/Timing/time stamp{{/code}}

551

desc:first column: Local time in unix time. To get day, hour, minute, second you can use unix: e.g. date ~-~-date='@1553617729' or matlab, python etc

552

second column: microseconds

553

third column: Train ID of FLASH

554

\\

555

556

[[Contents>>doc:||anchor="Contents"]]

\\

==== Pump Probe Laser (FLASH1) ====

561

562

{{code language="none"}}/FL1/Experiment/Pump probe laser/laser attenuation{{/code}}

563

564

//always saved (PBD)//

565

DOOCS prop : {{code language="none"}}TTF2.FEL/PPDELAYCAL/PPDELAYCAL/ROT2.CURRENT{{/code}}

566

DAQ channel: {{code language="none"}}TTF2.FEL/PPDELAYCAL/PPDELAYCAL/ROT2.CURRENT{{/code}}

567

desc: attenuation of the PPLaser (rotation of a waveplate)

568

units : 0 no transmission , 1: full transmission

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/laser delay{{/code}}

573

//always saved (PBD)//

574

DOOCS prop : {{code language="none"}}TTF2.FEL/PPDELAYCAL/PPDELAYCAL/DLY1.CURRENT{{/code}}

575

DAQ channel: {{code language="none"}}TTF2.FEL/PPDELAYCAL/PPDELAYCAL/DLY1.CURRENT{{/code}}

576

desc: delay of the Pump probe laser - measured by the read back position of the motor. only read out every secound ... better use the encoder

577

units : ps ( pos delay means IR comes later)

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/delay line IK220.0/ENC.DELAY{{/code}}

582

//always saved (PBD)//

583

DOOCS prop : {{code language="none"}}TTF2.FEL/DELLINE.ENC/IK220.0/ENC.DELAY{{/code}}

584

DAQ channel: {{code language="none"}}TTF2.FEL/DELLINE.ENC/IK220.0:ENC.DELAY{{/code}}

585

subsystem: {{code language="none"}}DELLINE.ENC{{/code}} desc : delay of the Pump probe laser - measured by an encoder. The position is read out with 10Hz train synchronized and should be used to determine the actual laser delay (the motor position is only read out about every second

586

units : ps ( pos delay means IR comes later)

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/Synchronization/timing jitter RMS GECCO{{/code}}

591

//always saved (PBD)//

592

DOOCS prop : {{code language="none"}}FLASH.SYNC/F1PPL.LASER_LOCK/28C.F1PPL1.CONTROLLER/ADV_CTRL_MANAGER.0.PID_INPUT_JITTER.2.RD{{/code}}

593

DAQ channel: {{code language="none"}}FLASH.SYNC/F1PPL.LASER_LOCK/28C.F1PPL1.CONTROLLER/ADV_CTRL_MANAGER.0.PID_INPUT_JITTER.2.RD{{/code}}

594

desc: rms jitter of the GECCO (% class="twikiNewLink" %)TiSa(%%) Oscillator units: fs

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/streak camera delay time{{/code}}

599

//always saved (PBD)//

600

DOOCS prop : {{code language="none"}}TTF2.FEL/TDOLFEL/TDOLFEL/STREAK.CAM.TIME{{/code}}

601

DOOCS prop : {{code language="none"}}TTF2.FEL/TDOLFEL/TDOLFEL/STREAK.CAM.TIME{{/code}}

602

desc: delaytime between the optical laser and the FEL units: ps

\\

[[Contents>>doc:||anchor="Contents"]]

\\

==== User Data (FLASH1) ====

611

612

The data saved specifically for detectors at an experiment will show up in /Experiment/ there is a large number of options for cameras or monitoring pslow properties (motor positons etc) for user experiments. For details please ask your local contact.

613

614

NOTE: If parameters for an experiment are included on short notice the correct naming in the HDF5 may not be in time and the data will show up in /uncategorized/ with the DOOCS names

615

616

The most common and permanently installed device used by experiment are our ADCs:

===== GHz ADCs =====

ADC traces of the (SPDevices 412) GHZ ADCs available for the users . More information about the ADCs can be found** [[here>>doc:FLASHUSER.Data Acquisition and controls.Controls (DOOCS, jDDD,\.\.\.).MTCA ADCs.WebHome]]**

621

//saved on DEMAND in the user DAQ//

622

\\The HDF5 names for the ADC traces are depending on the beamline :

623

\\PG Beamline:

624

{{code language="none"}}/FL1/Experiment/PG/ADQ412 GHz ADC/CH00/TD{{/code}}

625

{{code language="none"}}/FL1/Experiment/PG/ADQ412 GHz ADC/CH01/TD{{/code}}

626

{{code language="none"}}/FL1/Experiment/PG/ADQ412 GHz ADC/CH02/TD{{/code}}

627

{{code language="none"}}/FL1/Experiment/PG/ADQ412 GHz ADC/CH03/TD{{/code}}

628

629

BL Beamlines:

630

{{code language="none"}}/FL1/Experiment/BL1/ADQ412 GHz ADC/CH00/TD{{/code}}

631

{{code language="none"}}/FL1/Experiment/BL1/ADQ412 GHz ADC/CH01/TD{{/code}}

632

{{code language="none"}}/FL1/Experiment/BL1/ADQ412 GHz ADC/CH02/TD{{/code}}

633

{{code language="none"}}/FL1/Experiment/BL1/ADQ412 GHz ADC/CH03/TD{{/code}}

634

\\{{code language="none"}}/FL1/Experiment/BL2/ADQ412 GHz ADC/CH00/TD{{/code}}

635

{{code language="none"}}/FL1/Experiment/BL2/ADQ412 GHz ADC/CH01/TD{{/code}}

636

\\{{code language="none"}}/FL1/Experiment/BL3/ADQ412 GHz ADC/CH02/TD{{/code}}

637

{{code language="none"}}/FL1/Experiment/BL3/ADQ412 GHz ADC/CH03/TD{{/code}}

638

639

DOOCS prop : {{code language="none"}}FLASH.FEL/ADC.ADQ.PG/EXP1.CH00/CH00.TD or CH00.DAQ.TD{{/code}}

640

here the {{code language="none"}}CH00.TD{{/code}} is the full ADC trace as it is sampled ( typically several 100.000 samples per pulse train) while the {{code language="none"}}CH00.DAQ.TD{{/code}} trace only has the number of samples which are sent to the DAQ OR if //grouping// is activated the {{code language="none"}}CH00.DAQ.TD{{/code}} conatins only the grouped spectra. To read the ADC trace with an online analysis program the {{code language="none"}}CH00.DAQ.TD{{/code}} is used preferablly.

641

DAQ channel: {{code language="none"}}FLASH.FEL/ADC.ADQ.PG/EXP1.CH00{{/code}}

642

643

In addition there are also additional parameters saved like:

644

645

* {{code language="none"}}sample frequency{{/code}}: it shows the sample frequency in MHz (number of samples per µs). NOTE: the clock of the ADC is NOT synchronized to the FLASH timing system. Thus the number of samples between bunches in the bunch train may be not integer numbers which will be show up for long bunch trains.

646

* {{code language="none"}}number of samples{{/code}}: total number of samoles recorded for each 10 Hz trigger

647

* {{code language="none"}}error (ADC):{{/code}} 0 indicates that there was no error

===== MHz ADCs =====

similar to the GHz ADCs the MHz ADCs are saved with HDF5 names like:

652

{{code language="none"}}/FL1/Experiment/BL1/SIS8300 100MHz ADC/CH2/TD{{/code}}

653

DOOCS prop : FLASH.FEL/ADC.SIS.BL1/EXP1.CH02/CH00.TD

654

DAQ channel: : FLASH.FEL/ADC.SIS.BL1/EXP1.CH02

655

656

In addition there are also additional parameters saved like:

657

658

* {{code language="none"}}sample frequency{{/code}}: it shows the sample frequency in MHz (number of samples per µs). NOTE: the clock of the ADC is NOT synchronized to the FLASH timing system. Thus the number of samples between bunches in the bunch train may be not integer numbers which will be show up for long bunch trains.

659

* {{code language="none"}}number of samples{{/code}}: total number of samoles recorded for each 10 Hz trigger

660

661

[[Contents>>doc:||anchor="Contents"]]

\\

\\

\\

=== FLASH2 ===

There is analog to FLASH1 a permanently running "PhotonDagnostic DAQ FLASH2" (PBD2) and 2 User DAQs

672

673

==== Beamline info (FLASH2) ====

674

675

{{code language="none"}}/FL2/Beamlines/Attenuator/pressure {{/code}}

676

(% style="color: rgb(0,0,0);" %)//always saved (PBD2)// (%%)

677

(% style="color: rgb(0,0,0);" %)DOOCS prop : {{code language="none"}}FLASH.FEL/ATT.GAS_DOSING/FL2.HALL/PRESSURE{{/code}} (%%)

678

(% style="color: rgb(0,0,0);" %)DAQ channel: {{code language="none"}}FLASH.FEL/ATT.GAS_DOSING/FL2.HALL/PRESSURE{{/code}} (%%)

679

(% style="color: rgb(0,0,0);" %)desc: set pressure in the gas attenuator (%%)

680

(% style="color: rgb(0,0,0);" %)units: mbar(%%)

681

\\

682

683

{{code language="none"}}/FL2/Beamlines/FL20/Shutter/open{{/code}}

684

//always saved (PBD2)//

685

DOOCS prop : {{code language="none"}}FLASH.FEL/ADC.SIS.FL2FS/FL20.SHUTTER/CH00.TD{{/code}}

686

DAQ channel: {{code language="none"}}FLASH.FEL/ADC.SIS.FL2FS/FL20.SHUTTER{{/code}}

687

desc: BL Beamline Fast shutter state: 1 is open, 0 is closed ( for technical reasons there are 100 vales of this state saved ...)

units: none

{{code language="none"}}/FL2/Beamlines/Filter wheel/position wheel 1{{/code}}

692

//always saved (PBD2)//

693

DOOCS prop : {{code language="none"}}FLASH.FEL/FL20H.PH.MOTOR/MOTOR1.MOT3/FPOS{{/code}}

694

DAQ channel: FLASH.FEL/FL20H.PH.MOTOR/MOTOR1.MOT3/FPOS

695

desc: Position of the BL filter wheel 1 - to correlate with the filter material please look **[[here>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]]**

units: degree

\\

/FL2/Beamlines/Filter wheel/position wheel 2

700

always saved (PBD2)

701

DOOCS prop : {{code language="none"}}FLASH.FEL/FL20H.PH.MOTOR/MOTOR2.MOT3/FPOS{{/code}}

702

DAQ channel: {{code language="none"}}FLASH.FEL/FL20H.PH.MOTOR/MOTOR2.MOT3/FPOS{{/code}}

703

desc: Position of the BL filter wheel 2 - to correlate with the filter material please look [[here>>doc:FLASHUSER.jddd-linked help pages.Filter-Units.Filter wheels in FLASH1 and FLASH2.WebHome]]

units: degree

\\

NOTE: Aperture positions in the beamline as well as the positions of the beam steering mirrors are also saved. for more Info contact your local contact

709

710

[[Contents>>doc:||anchor="Contents"]]

\\

\\

==== Photon Diagnostics SASE ([[XGMD>>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/gmd_intensity_and_position/index_eng.html||shape="rect"]] - FLASH2) ====

717

718

{{code language="none"}}/FL2/Photon Diagnostic/GMD/Average energy/energy tunnel{{/code}}

719

//always saved (PBD2)//

720

DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.PHOTONFLUX/FL2.TUNNEL/PHOTONFLUX.UJ{{/code}}

721

DAQ channel:{{code language="none"}} FLASH.FEL/XGM.PHOTONFLUX/FL2.TUNNEL/PHOTONFLUX.UJ{{/code}}

722

desc : calibrated average ( ~~ 20 sec averaging time ) SASE Energy/pulse measured in the TUNNEL before the attenuator (ion current)

units : microJ

\\

{{code language="none"}}/FL2/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel{{/code}}

728

//always saved (PBD2)//

729

DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL/INTENSITY.TD{{/code}}

730

DAQ channel: {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL/INTENSITY.TD{{/code}}

731

desc : Energy per pulse measured in the Tunnel (in front of the gas attenuator and the apertures in the Hall) In addition measurement errors and beam position are included for EACH pulse in the pulse train !! (see below)

732

units : a.u. (more or less µJ but need to be calibrated with the "Average energy" for good precision)** [[see here for help>>doc:FLASHUSER.jddd-linked help pages.Calibrating the pulse resolved (electron) data from GMD.WebHome]]**

733

734

735

For every pulse in the pulse train the information is saved:

736

737

738

1. **Intensity per pulse** (a.u. (more or less µJ ))

739

1. Intensity per pulse (auxillary GMD) - not used

740

1. Position horizontal (mm, for a single pulse the position information may be very noisy - talk to your local contact)

741

1. Position vertical (mm, for a single pulse the position information may be very noisy - talk to your local contact)

742

1. **Intensity per pulse sigma** (a.u. (more or less µJ ), (% style="color: rgb(0,0,0);" %)This parameter gives an indication of the error of the measurement of the pulse energy. This takes signal to noise, detector resolution, uncertainties in crossection etc into account. (it is NOT the measurement of the statistical fluctuation of the SASE pulses)(%%))

743

1. Position horizontal sigma (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)

744

1. Position vertical sigma (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)

745

1. Combined warning and error flags

746

747

The pulse energy and the error are plotted for the first bunch of the pulse trains saved in this

file

[[image:attach:image2021-2-9_10-51-6.png||height="250"]]

\\

\\

All values for the GMD are also available for the** HALL GMD **which is located in the experimental hall down stream the gas attenuator. If the attenuator is on the ratio between Hall and Tunnel signal shows the attenuation. **BUT NOTE** that the filter unit and the Aperture 4 are downstream the GMD. So if filters and aperture are used this influence is NOT measured by the GMD hall !

\\

Besides pulse energy the GMD also provides information about the beam position

\\

{{code language="none"}}/FL2/Photon Diagnostic/GMD/Average Beam position/position tunnel horizontal{{/code}}

767

//always saved (PBD2)//

768

DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL2.TUNNEL/IX.POS{{/code}}

769

DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL2.TUNNEL/IX.POS{{/code}}

770

desc : the Average ( ~~ 20 sec averaging time ) Beam position of the photon Beam determined by the GMD (tunnel, x=horizontal)

units : mm

\\

{{code language="none"}}/FL2/Photon Diagnostic/GMD/Average Beam position/position tunnel vertical{{/code}}

776

//always saved (PBD2)//

777

DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.POSMON/FL2.TUNNEL/IY.POS{{/code}}

778

DAQ channel: {{code language="none"}}FLASH.FEL/XGM.POSMON/FL2.TUNNEL/IY.POS{{/code}}

779

desc : the Average ( ~~ 20 sec averaging time ) Beam position of the photon Beam determined by the GMD (tunnel, x=horizontal)

units : mm

\\

/FL2/Photon Diagnostic/GMD/Pulse resolved beam position/position tunnel x

785

always saved (PBD2)

786

DOOCS prop : FLASH.FEL/XGM.BPM/FL2.HALL/X.TD

787

DAQ channel: FLASH.FEL/XGM.BPM/FL2.HALL:2

788

desc: Besides the well calibrated averaged beam position information there is also the option to measure the beam position on a single bunch level. HOWEVER this methide needs a perfectly adjusted signal level (talk to your local contact !!) and also then the signal to noise is rather small and one needs some averaging ... BUT with this option one can determine if there was a spatial slope on a burst (say forst bunches were lower than the last ones or so ...)

789

units : mm

790

791

(x=horizontal, y = vertial)

792

793

again the same parameter set is available for the **HALL GMD**

\\

\\

==== Photon Diagnostics OPIS[[ >>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/opis_spectrometer/index_eng.html||shape="rect"]](FLASH2) ====

800

801

for more info see:** [[ OPIS>>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/opis_spectrometer/index_eng.html||shape="rect"]]**

802

803

(The OPIS hall is not installed yet ...)

\\

{{code language="none"}}/FL2/Photon Diagnostic/Wavelength/OPIS tunnel/Processed/mean photon energy{{/code}}

808

// saved opon request (PBD2)//

809

DOOCS prop : {{code language="none"}}FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL042{{/code}}

810

DAQ channel:{{code language="none"}} FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL042{{/code}}

811

desc : mean photon energy ( ~~ 1 sec averaging time ) measured in the TUNNEL for a specific bunch out of the bunch train (via photoelectron spectroscopy)

units : eV

\\

{{code language="none"}}/FL2/Photon Diagnostic/Wavelength/OPIS tunnel/Processed/mean wavelength{{/code}}

817

// saved opon request (PBD2)//

818

DOOCS prop : {{code language="none"}}FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL040{{/code}}

819

DAQ channel:{{code language="none"}} FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL040{{/code}}

820

desc : meanwavelength ( ~~ 1 sec averaging time ) measured in the TUNNEL for a specific bunch out of the bunch train (via photoelectron spectroscopy)

units : nm

\\

{{code language="none"}}/FL2/Photon Diagnostic/Wavelength/OPIS tunnel/Processed/number of analyzed bunch (in older version this can be found in OPIS tunnel/Expert stuff/General operation parameters/){{/code}}

826

// saved opon request (PBD2)//

827

DOOCS prop : {{code language="none"}}FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL060{{/code}}

828

DAQ channel:{{code language="none"}} FLASH.UTIL/STORE/FL2.TUNNEL.OPIS/VAL060{{/code}}

829

desc : The bunch number of the bunch used for the wavelength calculation

units :

\\

If Opis is running typically on the the averaged data is saved. For several experiments it may make sense to save the information for each single bunch. This is up to now done by savng the compleate ADC trace of the TOF setup. This is a huge amount of data and needs processing. This has to be performed after the beamtime in close contact to [[Markus Braune>>mailto:markus.braune@desy.de||shape="rect"]] ( respobsible for [[OPIS>>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/opis_spectrometer/index_eng.html||shape="rect"]])

\\

In case OPIS was not operating there is still informaton about the **set wavelength** for the undulators (see below) which may differ by up to 5 % from the actual wavelength due to different settings in the FEL ...

\\

\\

==== Electron Beam properties (FLASH2) ====

845

846

===== bunch charge =====

847

848

{{code language="none"}}/FL2/Electron Diagnostic/Bunch charge/after undulator{{/code}}

849

//always saved (PBD2)//

850

DOOCS prop : {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/9FL2BURN/CHARGE.FLASH2{{/code}}

851

DAQ channel: {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/9FL2BURN/CHARGE.FLASH2{{/code}}

852

desc: electron bunch charge FLASH2 (average value for each bunchtrain).

units: nC

\\

===== undulator settings =====

858

859

{{code language="none"}}/FL2/Electron Diagnostic/Undulator setting/set wavelength{{/code}}

860

//always saved (PBD2)//

861

DOOCS prop : {{code language="none"}}TTF2.FEEDBACK/FL2.WAVELENGTHCONTROL/FLASH2/WAVELENGTH{{/code}}

862

DAQ channel: {{code language="none"}}TTF2.FEEDBACK/FL2.WAVELENGTHCONTROL/FLASH2/WAVELENGTH{{/code}}

863

desc: Set value for the anticipated wavelength . This parameter is used to set the undulator gap. It may however deviate from the actual wavelength by several % ...

864

units: nm

865

866

{{code language="none"}}/FL2/Electron Diagnostic/Undulator setting/SASE14 gap{{/code}}

867

//always saved (PBD2)//

868

DOOCS prop : {{code language="none"}}FLASH.UTIL/FL2.UND.MOTOR/FL2SASE14/GAP{{/code}}

869

DAQ channel: {{code language="none"}}FLASH.UTIL/FL2.UND.MOTOR/FL2SASE14/GAP{{/code}}

870

desc: gap value of the undulators. This can be used to follow up how many undulators were closed and if there was a taper

871

units: mm

872

873

The gap values are saved for all 12 undulators (Nr 3 to 14). Undulator 14 is the one closest to the experimental hall.

=====

arrival time =====

{{code language="none"}}/FL2/Electron Diagnostic/BAM/8FL2XTDS/electron bunch arrival time (low charge){{/code}}

879

//always saved (PBD2)//

880

DOOCS prop : {{code language="none"}}FLASH.SDIAG/BAM/8FL2XTDS/LOW_CHARGE_ARRIVAL_TIME{{/code}}

881

DAQ channel: {{code language="none"}}FLASH.SDIAG/BAM.DAQ/8FL2XTDS.LOW_CHARGE_ARRIVAL_TIME{{/code}}

882

desc: Electron bunch arrival time measured with the BAM after the FLASH2 undulator (pulse resolved data)

883

units: ps (bigger numbers indicate later arrivaltime of the electrons)

884

885

**FL1**{{code language="none"}}//Electron Diagnostic/BAM/4DBC3/electron bunch arrival time (low charge){{/code}}

886

//always saved (PBD2)//

887

DOOCS prop : {{code language="none"}}FLASH.SDIAG/BAM/4DBC3/LOW_CHARGE_ARRIVAL_TIME{{/code}}

888

DAQ channel: {{code language="none"}}FLASH.SDIAG/BAM.DAQ/4DBC3.LOW_CHARGE_ARRIVAL_TIME{{/code}}

889

desc: Electron bunch arrival time measured with the BAM in the accelerator (pulse resolved data)

890

units: ps (bigger numbers indicate later arrivaltime of the electrons)

\\

* The BAM 4DBC3 measures the arrivaltime of** FLASH 1 and FLASH2** in the same data set (thus also sorted in at /FL1/ !).

896

* The BAM 8FL2XTDS measures only for FLASH2 BUT has the same data structure as the other BAMS ... thus there are also (random) values in in the FLASH1 time slot

897

** Structure: The first values are for FLASH1 bunches. After a gap of about 70 micros ( 70 colums) with as entry for the switching between FLASH 1 and 2 the values for the electrons used in FLASH2 start. The start time of FLASH2 is also recorded in the DAQ. FLASH1 start time is for historic reasons 700. thus if e.g. the start time of FLASH2 ( property name see below) is 1200 it means that FLASH starts at column 500 (1200-700) ... .In case of doubt ask your local contact

898

* [[Link a collection of papers related to the BAM and the analysis of pump-probe experiments >>doc:FLASHUSER.Additional helpful things.FLASH beamlines and instruments references.WebHome]]

899

* [[LINK to detailed infos from MSK (may only work inside DESY network~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:http://www.desy.de/~~mbock/pages/BAM_daq_channel_descriptions.html||shape="rect"]]

900

* a recent [[talk about the working principle of the BAM>>attach:BAM-basics and outlook-2018_DESY-template_16-9Format.pdf]]

[[Contents>>doc:||anchor="Contents"]]

\\

==== Timing information, rep rate etc. (FLASH2) ====

909

910

===== start time of FLASH2 =====

911

912

{{code language="none"}}/FL2/Timing/start time flash2{{/code}}

913

//always saved (PBD2)//

914

DOOCS prop : {{code language="none"}}FLASH.DIAG/TIMER/FLASHCPUTIME1.0/BUNCH_POSITION.2{{/code}}

915

DAQ channel: {{code language="none"}}FLASH.DIAG/TIMER/FLASHCPUTIME1.0/BUNCH_POSITION.2{{/code}}

916

desc: The max 600 µs acceleration time of FLASH is devided between FLASH1 and FLASH2. This 600 µs window starts with FLASH1 (up to now) at a time"label" of 700 µs (for historic reasons). Thus the first bunch of FLASH 1 comes at "700" and the last possibel bunch comes at 1300 (700+600). After FLASH1 train is over ther is a about 70µs switching time with no bunches. Then comes the first FLASH2 bunch. Thus if e.g. the start time of FLASH2 is 1200 it means that FLASH2 starts at column 500 (1200-700) in the HDF5 files. (However for yet unknown reasons this may change by 2-3 colums ...)

917

units: µs

918

919

===== bunch repetition rate =====

920

921

{{code language="none"}}/FL2/Timing/repetition rate{{/code}}

922

//always saved (PBD2)//

923

DOOCS prop : {{code language="none"}}FLASH.DIAG/TIMER/FLASHCPUTIME1.0/REP_RATE_KHZ.2{{/code}}

924

DAQ channel: {{code language="none"}}FLASH.DIAG/TIMER/FLASHCPUTIME1.0/REP_RATE_KHZ.2{{/code}}

925

desc: repetition rate of the bunches / pulses within the burst (FLASH2)

926

units: kHz

927

928

===== actual number of pulses =====

929

930

{{code language="none"}}/FL1/Timing/actual number of bunches{{/code}}

931

//always saved (PBD2)//

932

DOOCS prop : {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/3GUN/NUMBEROFBUNCHES.FLASH2{{/code}}

933

DAQ channel: {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/3GUN/NUMBEROFBUNCHES.FLASH2{{/code}}

934

desc: Number of bunches measured BEHIND the undulator. If pulses are used for diagnostic of the protection system of the accelerator limits the number of bunches to be accelerated this is the actual number that created XUV radiation.The number is calculated by the DAQ middle layer server, (FLASH2)

units:

\\

===== actual pulse pattern recorded after the undulator =====

939

940

{{code language="none"}}/FL1/Timing/Bunch pattern/pattern after undulator{{/code}}

941

//always saved (PBD2)//

942

DOOCS prop : {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/9FL2BURN.PULSEPATTERN{{/code}}

943

DAQ channel: {{code language="none"}}FLASH.DIAG/PBD2.TOROID.ML/9FL2BURN.PULSEPATTERN{{/code}}

944

desc: The bunch pattern as function of time in a burst recorded by toroide diagnostic BEHIND the undulator. (FLASH2)

units:

\\

===== Train ID =====

{{code language="none"}}/Timing/train ID{{/code}}

951

//always saved (PBD2)//

952

DOOCS prop : {{code language="none"}}none{{/code}}

953

DAQ channel: {{code language="none"}}none{{/code}}

954

desc: Each 10 Hz burst has its unique train ID. For the HDF5 dataset the ID is the same for all parameters with the same index (note camera images may be shifted by 1 ID - talk to the experts !)

units:

\\

===== Train time =====

959

960

//always saved (PBD2)

961

//{{code language="none"}}/Timing/train time{{/code}}

962

desc:Local time as array of day, hour, minute, second, and centisecond. This dataset is meant for visualisation purposes only. For correlations use the train ID or the Unix time of the time stamp

units: d h min s cs

\\

{{code language="none"}}/Timing/time stamp{{/code}}

967

968

//always saved (PBD2)//

969

desc: first column: Local time in unix time. To get day, hour, minute, second you can use unix: e.g. date ~-~-date='@1553617729' or matlab, python etc

970

second column: microseconds

971

third column: Train ID of FLASH

972

\\

973

974

[[Contents>>doc:||anchor="Contents"]]

\\

==== User Data (FLASH2) ====

979

980

The data saved specifically for detectors at an experiment will show up in /Experiment/ there is a large number of options for cameras or monitoring pslow properties (motor positons etc) for user experiments. For details please ask your local contact.

981

982

NOTE: If parameters for an experiment are included on short notice the correct naming in the HDF5 may not be in time and the data will show up in /uncategorized/ with the DOOCS names

983

984

The most common and permanently installed device used by experiment are our ADCs:

===== GHz ADCs =====

ADC traces of the (SPDevices 412) GHZ ADCs available for the users . More information about the ADCs can be found** [[here>>doc:FLASHUSER.Data Acquisition and controls.Controls (DOOCS, jDDD,\.\.\.).MTCA ADCs.WebHome]]**

989

//saved on DEMAND in the user DAQ//

990

\\Up to now there are 4 channels available at FL24

991

\\\\{{code language="none"}}/FL2/Experiment/MTCA-EXP1/ADQ412 GHz ADC/CH00/TD{{/code}}

992

{{code language="none"}}/FL2/Experiment/MTCA-EXP1/ADQ412 GHz ADC/CH01/TD{{/code}}

993

\\{{code language="none"}}/FL2/Experiment/MTCA-EXP1/ADQ412 GHz ADC/CH02/TD{{/code}}{{code language="none"}}/FL2/Experiment/MTCA-EXP1/ADQ412 GHz ADC/CH03/TD{{/code}}

\\

DOOCS prop : {{code language="none"}}FLASH.FEL/ADC.ADQ.FL2EXP1/FL2EXP1.CH00/CH00.TD or CH00.DAQ.TD{{/code}}

998

here the {{code language="none"}}CH00.TD{{/code}} is the full ADC trace as it is sampled ( typically several 100.000 samples per pulse train) while the {{code language="none"}}CH00.DAQ.TD{{/code}} trace only has the number of samples which are sent to the DAQ OR if //grouping// is activated the {{code language="none"}}CH00.DAQ.TD{{/code}} conatins only the grouped spectra. To read the ADC trace with an online analysis program the {{code language="none"}}CH00.DAQ.TD{{/code}} is used preferablly.

999

DAQ channel: {{code language="none"}}FLASH.FEL/ADC.ADQ.FL2EXP1/FL2EXP1.CH00{{/code}}

1000

1001

In addition there are also additional parameters saved like:

1002

1003

* {{code language="none"}}sample frequency{{/code}}: it shows the sample frequency in MHz (number of samples per µs). NOTE: the clock of the ADC is NOT synchronized to the FLASH timing system. Thus the number of samples between bunches in the bunch train may be not integer numbers which will be show up for long bunch trains.

1004

* {{code language="none"}}number of samples{{/code}}: total number of samoles recorded for each 10 Hz trigger

1005

* {{code language="none"}}error (ADC):{{/code}} 0 indicates that there was no error

1006

* {{code language="none"}}/CH0-CH3/offset{{/code}}: To use the full dynamic range of the ADC one can shift the base line . This offset is saved here.

===== MHz ADCs =====

similar to the GHz ADCs the MHz ADCs are saved with HDF5 names like:

1011

{{code language="none"}}/FL2/Experiment/MTCA-EXP1/SIS8300 100MHz ADC/CH2/TD{{/code}}

1012

DOOCS prop : FLASH.FEL/ADC.SIS.FL2EXP1/FL2EXP1.CH02/CH00.TD

1013

DAQ channel: : FLASH.FEL/ADC.SIS.FL2EXP1/FL2EXP1.CH02

1014

1015

In addition there are also additional parameters saved like:

1016

1017

* {{code language="none"}}sample frequency{{/code}}: it shows the sample frequency in MHz (number of samples per µs). NOTE: the clock of the ADC is NOT synchronized to the FLASH timing system. Thus the number of samples between bunches in the bunch train may be not integer numbers which will be show up for long bunch trains.

1018

* {{code language="none"}}number of samples{{/code}}: total number of samoles recorded for each 10 Hz trigger

1019

1020

[[Contents>>doc:||anchor="Contents"]]

\\

\\

==== Pump Probe Laser (FLASH2) ====

1027

1028

There may be more information available from the "Laser DAQ". laese contact your Laser Local Contact.

1029

1030

1031

{{code language="none"}}/FL2/Experiment/Pump probe laser/FL24/attenuator position{{/code}}//always saved (PBD2)//

1032

DOOCS prop : {{code language="none"}}FLASH.FEL/FLAPP2BEAMLINES/MOTOR1.FL24/FPOS{{/code}}

1033

DAQ channel: {{code language="none"}}FLASH.FEL/FLAPP2BEAMLINES/MOTOR1.FL24/FPOS{{/code}}

1034

desc: attenuation of the PPLaser in the FL24 hutch (rotation of a waveplate)

units : deg.

\\

{{code language="none"}}/FL2/Experiment/Pump probe laser/FL24/polarization position{{/code}}//always saved (PBD2)//

1041

DOOCS prop : {{code language="none"}}FLASH.FEL/FLAPP2BEAMLINES/MOTOR2.FL24/FPOS{{/code}}

1042

DAQ channel: {{code language="none"}}FLASH.FEL/FLAPP2BEAMLINES/MOTOR2.FL24/FPOS{{/code}}

1043

desc: attenuation of the PPLaser in the FL24 hutch (rotation of a waveplate)

units : deg.

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/laser delay readback{{/code}}

1049

//always saved (PBD2)//

1050

DOOCS prop : {{code language="none"}}FLASH.SYNC/LASER.LOCK.EXP/FLASH2.PPL1.OSC1/FMC0.MD22.0.POSITION.RD{{/code}}

1051

DAQ channel: {{code language="none"}}FLASH.SYNC/LASER.LOCK.EXP/FLASH2.PPL1.OSC1/FMC0.MD22.0.POSITION.RD{{/code}}

1052

desc: delay of the Pump probe laser - measured by the read back position of the motor. There is also the set value available ( upto now these values are only updating every 1-2 seconds. There is no fast encoder property as on FLASH1 available)

units : ps )

\\

{{code language="none"}}/FL1/Experiment/Pump probe laser/Synchronization/timing jitter RMS{{/code}}

1058

//always saved (PBD)//

1059

DOOCS prop : {{code language="none"}}FLASH.SYNC/LASER.LOCK.EXP/FLASH2.PPL1.OSC1/CURRENT_INPUT_JITTER.RD{{/code}}

1060

DAQ channel: {{code language="none"}}FLASH.SYNC/LASER.LOCK.EXP/FLASH2.PPL1.OSC1/CURRENT_INPUT_JITTER.RD{{/code}}

1061

desc: rms jitter of the fs-Oscillator

1062

units: fs

1063

1064

[[Contents>>doc:||anchor="Contents"]]

\\

=== "/uncategorized/" ===

1069

1070

If parameters for an experiment are included on short notice the correct naming in the HDF5 may not be in time and the data will show up in /uncategorized/ with their DOOCS names

\\

=== HDF5 structure revisions ===

1075

1076

Starting with Beamblock 4, August 2018, the hierarchy of the HDF group names have been adapted to reflect the new situation at FLASH. FLASH2 is operating for users quite some time now. Therefore, both accelerators appear equally in their respective HDF groups, namely "/FL1" and "/FL2". The root group of proper, by run organised HDF files have an attribute called "version". This version attribute has changed from "0.2.x" to "0.3.x". The changes in detail:

\\

* All FLASH1 related HDF groups moved to group "/FL1", i.e. a new prefix "/FL1" is added to their HDF path.

1081

* The ambigious term "pulse" has been replaced by "train" to refer to "pulse train". Most notably, the dataset "/Timing/pulse ID" has changed to "/Timing/train ID".

1082

* A number of inconsistent names have been streamlined. The relevant changes are listed in the following table.

\\

(% class="wrapped" %)

1087

|=(((

1088

earlier HDF path (vers. 0.2)

)))|=(((

is now (vers. 0.3)

)))

|(((

/Photon Diagnostic/GMD/Beam position/position BDA x

1094

)))|(((

1095

/FL1/Photon Diagnostic/GMD/Beam position/position BDA horizontal

1096

)))

1097

|(((

1098

/Photon Diagnostic/GMD/Beam position/position BDA y

1099

)))|(((

1100

/FL1/Photon Diagnostic/GMD/Beam position/position BDA vertical

1101

)))

1102

|(((

1103

/Photon Diagnostic/GMD/Beam position/position tunnel x

1104

)))|(((

1105

/FL1/Photon Diagnostic/GMD/Beam position/position tunnel horizontal

1106

)))

1107

|(((

1108

/Photon Diagnostic/GMD/Beam position/position tunnel y

1109

)))|(((

1110

/FL1/Photon Diagnostic/GMD/Beam position/position tunnel vertical

1111

)))

1112

|(((

1113

/Experiment/Pump probe laser/BPM/position x

1114

)))|(((

1115

/FL1/Experiment/Pump probe laser/BPM/position horizontal

1116

)))

1117

|(((

1118

/Experiment/Pump probe laser/BPM/position y

1119

)))|(((

1120

/FL1/Experiment/Pump probe laser/BPM/position vertical

1121

)))

1122

|(((

1123

/FL2/Photon Diagnostic/GMD/Beam position/Average/position hall horizontal

1124

)))|(((

1125

/FL2/Photon Diagnostic/GMD/Average beam position/position hall horizontal

1126

)))

1127

|(((

1128

/FL2/Photon Diagnostic/GMD/Beam position/Average/position hall vertical

1129

)))|(((

1130

/FL2/Photon Diagnostic/GMD/Average beam position/position hall vertical

1131

)))

1132

|(((

1133

/FL2/Photon Diagnostic/GMD/Beam position/Average/position tunnel horizontal

1134

)))|(((

1135

/FL2/Photon Diagnostic/GMD/Average beam position/position tunnel horizontal

1136

)))

1137

|(((

1138

/FL2/Photon Diagnostic/GMD/Beam position/Average/position tunnel vertical

1139

)))|(((

1140

/FL2/Photon Diagnostic/GMD/Average beam position/position tunnel vertical

1141

)))

1142

|(((

1143

/FL2/Photon Diagnostic/GMD/Average energy/hall

1144

)))|(((

1145

/FL2/Photon Diagnostic/GMD/Average energy/energy hall

1146

)))

1147

|(((

1148

/FL2/Photon Diagnostic/GMD/Average energy/hall (raw)

1149

)))|(((

1150

/FL2/Photon Diagnostic/GMD/Average energy/energy hall (raw)

1151

)))

1152

|(((

1153

/FL2/Photon Diagnostic/GMD/Average energy/tunnel

1154

)))|(((

1155

/FL2/Photon Diagnostic/GMD/Average energy/energy tunnel

1156

)))

1157

|(((

1158

/FL2/Photon Diagnostic/GMD/Average energy/tunnel (raw)

1159

)))|(((

1160

/FL2/Photon Diagnostic/GMD/Average energy/energy tunnel (raw)

1161

)))

1162

|(((

1163

/FL2/Photon Diagnostic/GMD/Beam position/Pulse resolved/hall x

1164

)))|(((

1165

/FL2/Photon Diagnostic/GMD/Pulse resolved beam position/position hall horizontal

1166

)))

1167

|(((

1168

/FL2/Photon Diagnostic/GMD/Beam position/Pulse resolved/hall y

1169

)))|(((

1170

/FL2/Photon Diagnostic/GMD/Pulse resolved beam position/position hall vertical

1171

)))

1172

|(((

1173

/FL2/Photon Diagnostic/GMD/Beam position/Pulse resolved/tunnel x

1174

)))|(((

1175

/FL2/Photon Diagnostic/GMD/Pulse resolved beam position/position tunnel horizontal

1176

)))

1177

|(((

1178

/FL2/Photon Diagnostic/GMD/Beam position/Pulse resolved/tunnel y

1179

)))|(((

1180

/FL2/Photon Diagnostic/GMD/Pulse resolved beam position/position tunnel vertical

)))

\\

[[Contents>>doc:||anchor="Contents"]]

\\

== Example code showing how to access HDF5 files ==

\\

== HDF5 and DOOCS ==

Here is an outdated [[list with the available properties that are always saved (PBD) for FLASH1 as>>attach:FLASH1__DaqChannel2HdfNamePbd.xlsx]] HDF5 names and the corresponding DOOCS names

1196

1197

[[Contents>>doc:||anchor="Contents"]]

\\

\\

\\

Wiki source code of The FLASH HDF5 structure