Before beamtime Checklist

= Questions to consider before the beamtime =

Weeks before the actual beamtime the Usergroup should think about the needs for the experiment and get in contact to the DAQ / IT group at FLASH and define several boundary conditions:

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* What kind of data you want to record in the FLASH DAQ?

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** Several options of the photon diagnostic are available which are NOT operated as standard (VLS, OPIS, ... see [[Photon Diag pages~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:http://photon-science.desy.de/facilities/flash/photon_diagnostics/index_eng.html||shape="rect"]]

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** What kind of ADC is the best one for you? Are amplifiers needed? what sample rate, how many channels ...

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** [[Cameras~[~[image:url:http://hasfweb.desy.de/pub/TWiki/TWikiDocGraphics/external-link.gif~|~|width="13" height="12"~]~]>>url:https://ttfinfo.desy.de/FLASHWiki/Wiki.jsp?page=Camera%20server||shape="rect"]] can be integrated in the FLASH DAQ system - talk to the experts (well in advance !) if you plan to use cameras.

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** For detector systems such as pnCCD imaging- detectors and ion/electron spectrometers available at the CAMP end-station please contact us to discuss your particular requirements (well in advance !).

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* Do you have own detectors to be recorded ?

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** It has to be checked that they can be stored on the FLASH data storage (gpfs)

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** They could probably be included in the FLASH DAQ system - _this needs sufficient lead time. Talk several WEEKS before the beam time to the local contact / experts _

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* What parameters you need to monitor life during the beamtime?

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** how you plan to monitor the parameters (jDDD, Matlab, Python, Labview) ?

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** do you need online treatment of data ( averaging, integration of peaks ...) ?

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** do you have to control Hardware from FLASH ( e.g. delaylines ...). Do you need scans with online display ?

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* data analysis needs

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** Do you need nearOnline HDF5 files for your (semi-online) analysis during the beamtime.

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** Which parameters do you need for your (semi-online) analysis ?

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** how do you want to do analyze your data ? Can we find scripts from other users servering most of your needs?

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** How much computational power will the analysis need (can we use the analysis servers at the beamline or do we have to use more powerfull recources) ?

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* Data access after the beamtime:

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** data recorded with the FLASH DAQ will have to be moved to a long time (tape) storage few month after the beamtime. During / shortly after the beamtime it has to be decided where to put the data.

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== Pre and post beamtime questionnaires ==

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