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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:

  • What kind of data you want to record in the FLASH DAQ?
    • Several options of the photon diagnostic are available which are NOT operated as standard (VLS, OPIS, ... see Photon Diag pages
    • What kind of ADC is the best one for you? Are amplifiers needed? what sample rate, how many channels ...
    • Cameras can be integrated in the FLASH DAQ system - talk to the experts (well in advance !) if you plan to use cameras.
    • 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 !).

  • Do you have own detectors to be recorded ?
    • It has to be checked that they can be stored on the FLASH data storage (gpfs)
    • 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 _

  • What parameters you need to monitor life during the beamtime?
    • how you plan to monitor the parameters (jDDD, Matlab, Python, Labview) ?
    • do you need online treatment of data ( averaging, integration of peaks ...) ?
    • do you have to control Hardware from FLASH ( e.g. delaylines ...). Do you need scans with online display ?

  • data analysis needs
    • Do you need nearOnline HDF5 files for your (semi-online) analysis during the beamtime.
    • Which parameters do you need for your (semi-online) analysis ?
    • how do you want to do analyze your data ? Can we find scripts from other users servering most of your needs?
    • 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) ?

  • Data access after the beamtime:
    • 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.

It is recommended to fill in a beamtime preparation questionnaire together with your corresponding local contact.

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