Before beamtime Checklist

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)>>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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** several types of cameras 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 how 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 in jddd or Python (if absolutely needed: Matlab, 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 ? - //IF the control has to be done for a NOT DESY computer ( not DESY/FLASH login) this requires special attention as well . It wirks but has to be set up and tested !!//

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* **data analysis needs**

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** Do you need 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 serving most of your needs? explain the FAB framework that helps analyzing data in advance

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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 powerful ressources) ?

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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 locally recorded data.

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