History: GEn

!! Documentation
* ((GEnDocChannelMap|GEn hardware connection scheme))
* ((GEnDocEpics|Epics variables))
* ((GEnDocTrigger|Trigger schemes))
!!! GEn Raw Data Structure (by Robert Michaels)
!!!!- Overview
The raw data structure recorded in the GEn DAQ datastream will be described. This includes the following data:
# Event data recorded with each accepted trigger (fastbus and VME data from the two spectrometers and from the BPM and raster)
# scalers
# EPICS information
# "special events" which are inserted once or infrequently during a run, such as prescale information and detector map.

These data are decoded by the Podd Analyzer classes developed for GEn, see also GEn Analyzer documentation. I won't go into that here, but suffice it to say you need an up-to-date database with correct crate map and detector maps.

I will not describe the various other datastreams in Hall A, such as Moller polarimeter, e-P energy measurement, Compton Polarimeter, etc.