Changes for page The FLASH HDF5 structure

Last modified by sndueste on 2025/02/06 10:55
From version 37.1
edited by cpassow
on 2020/11/23 16:26
Change comment: There is no comment for this version
To version 38.1
edited by sndueste
on 2021/02/09 10:51
Change comment: There is no comment for this version

Summary

Details

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Author
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1 -XWiki.cpassow
1 +XWiki.sndueste
Content
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630 630  
631 631  \\
632 632  
633 -(% style="color: rgb(255,204,0);" %)average Sigma    to be included in
634 -
635 -(% style="color: rgb(193,199,208);" %){{code language="none"}}/FL2/Photon Diagnostic/GMD/Average energy/energy tunnel uncertainty{{/code}} (%%)
636 -(% style="color: rgb(193,199,208);" %)//always saved (PBD2)// (%%)
637 -(% style="color: rgb(193,199,208);" %)DOOCS prop : FLASH.FEL/XGM.PHOTONFLUX/FL2.TUNNEL/PHOTONFLUX.UJ.SIGMA (%%)
638 -(% style="color: rgb(193,199,208);" %)DAQ channel: FLASH.FEL/XGM.PHOTONFLUX/FL2.TUNNEL/PHOTONFLUX.UJ.SIGMA (%%)
639 -(% style="color: rgb(193,199,208);" %)desc :  This parameter gives an indication of the error of the measurement of the average 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)(%%)
640 -(% style="color: rgb(193,199,208);" %)units : microJ
641 -
642 -\\
643 -
644 -\\
645 -
646 646  {{code language="none"}}/FL2/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel{{/code}}
647 647  //always saved (PBD2)//
648 648  DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL/INTENSITY.TD{{/code}}
649 649  DAQ channel: {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL/INTENSITY.TD{{/code}}
650 -desc : Energy per pulse measured in the Tunnel  (in fromt of the gas attenuator and the apertures in the Hall)
637 +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)
651 651  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]]**
652 652  
653 -\\
640 +For every pulse in the pulse train the information is saved:
641 +
654 654  
655 -\\
643 +1. **Intensity per pulse** (a.u. (more or less µJ ))
644 +1. Intensity per pulse (auxillary GMD) - not used
645 +1. Position horizontal (mm, for a single pulse the position informytion may be very noisy  - talk to your local contact)
646 +1. Position vertical (mm, for a single pulse the position informytion may be very noisy  - talk to your local contact)
647 +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)(%%))
648 +1. Position horizontal sigma  (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)
649 +1. Position vertical sigma  (mm, indicates the error (RMS, sigma) of the measurement according to known uncertainties and signal to noise)
650 +1. Combined warning and error flags
656 656  
657 -{{code language="none"}}/FL2/Photon Diagnostic/GMD/Pulse resolved energy/energy tunnel uncertainty (sigma){{/code}}
658 -//always saved (PBD2)//
659 -DOOCS prop : {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL/INTENSITY.SIGMA.TD{{/code}}
660 -DAQ channel: {{code language="none"}}FLASH.FEL/XGM.INTENSITY/FL2.TUNNEL:4{{/code}}
661 -desc :(% 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)(%%)
662 -units : a.u. (more or less µJ - related to the value of the pulse energy )
652 +The pulse energy and the error are plotted for the first bunch of the pulse trains saved in this 
653 +file
663 663  
655 +
656 +[[image:attach:image2021-2-9_10-51-6.png||height="250"]]
664 664  
658 +
665 665  {{code language="none"}}{{/code}}
666 666  
667 667  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 !