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Summary: A 33kHz beam train simulation (28 buckets between shots) with a starting gap of 14000 buckets to allow a periodic 1Hz Andor to readout while not receiving beam.  A 100Hz trigger is added for other non-integrating detectors (e.g. opals).  Each sequence is repeated twice, although there appears to be an "off by one" difference in the definition of the repeat count of traingenerator (repeat=2) and periodicgenerator (repeat=1).  The "--notify" flag on periodic generator tells the DAQ to end the scan step after that finite sequence is complete after 2 andor images.  The andor "shutter" is always open, so the trigger event-code starts the readout.  The first andor image trigger in the first step clears out the old charge at the beginning so is not usable.the very first image data is "corrupted".  

export EPICS_PVA_ADDR_LIST=172.21.152.78 (allows rix-daq to talk to the XPM, e.g. to program sequences)

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