Difference between revisions of "How to Set EDTM Frequency with the DVCS Pulser"

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*Controlling the EDTM DVCS Pulser:
 
*Controlling the EDTM DVCS Pulser:
  
#Start by making sure the environment is setup correctly.
+
#Log on to sbs-onl@adaq1 and navigate to the /adaqfs/home/sbs-onl/bbhodo/ directory with the usual sbs-onl password.
 +
#Make sure the environment is setup correctly.
 +
export $REMEX_CMSG_HOST adaq2

Revision as of 21:54, 13 October 2021

The EDTM (electronic dead-time monitor) is controlled via a DVCS pulser in the bbhodo crate. This pulser creates a pulse, normally 20 Hz, that is injected into the trigger decision logic of BB and HCal coming from their summing modules. This will create a signal that looks like a real trigger, however there will be no useful data associated as the trigger is simply from a pulser. To distinguish these fake events in later analysis copies of the EDTM pulser are sent into F1TDCs of both BB and HCal. So, if an event in either detector has signal in the F1TDC channel that contains a copy of the EDTM pulser we know that this was an EDTM event and not a real physics trigger. We can then find the electronics dead-time, coupled with the DAQ dead-time still, by comparing the number of EDTM events BB and HCal saw versus the number of EDTM pulses in a scaler.

  • Controlling the EDTM DVCS Pulser:
  1. Log on to sbs-onl@adaq1 and navigate to the /adaqfs/home/sbs-onl/bbhodo/ directory with the usual sbs-onl password.
  2. Make sure the environment is setup correctly.

export $REMEX_CMSG_HOST adaq2