DAQ/Trigger Run Check Lists

Overview

• Here we discuss the necessary tasks which need to be completed at the beginning of a run period in order to ensure reliable operation of the single arm DAQ's as well as the coincidence DAQ.

Trigger Leg Definitions

STOF      :  2/2 {1/2 {S1X, S1Y}, 1/2 {S2X, S2Y}}
EL_LO_LO  :  2/3 {STOF, 3/4, PR-LO} 
EL_LO     :  2/2 {EL-LO-LO, CER}
EL_HI     :  3/3 {3/4, PR-HI, SH-LO}
EL_REAL   :  1/2 {EL_LO, EL_HI}
EL_CLEAN  :  2/2 {EL_LO, EL_HI}

General Checks

• Check SHMS & HMS hodoscope discriminator thresholds and widths
  • Nominally these are 50 ns and -30 mV
• Check SHMS & HMS PID trigger thresholds
• Check SHMS & HMS PID trigger DC offsets on scope

Single Arm DAQ Checks

• Check reference times are behaving as expected via scope
  • Reference time set-up
• Verify coincidence timing for composite triggers
  • HMS scope traces with beam
  • SHMS scope traces with beam
  • Scope traces of all legs of the trigger
• Check relative arrival time of 3/4, EL-REAL, and EL-CLEAN triggers at TM
  • Primary trigger should come first, subsequent triggers should arrive 10-20 ns later
• Watch for and correct any trigger related offsets due to different reference time shifts from different triggers
  • Software offsets to be determined and implemented
• Verify desired trigger takes the TDC timing
  • Ensure the intended reference time is being selected by the analyzer (sanity check self timing peaks)
• Verify readout windows are capturing all the data via. raw histograms
  • Use “production_all” replays to do this
  • Primary checks: trigger apparatus, hodoscopes, chambers
• Sanity check dead-times utilizing various forms of measurements

Coincidence DAQ Checks

• Verify SHMS & HMS coincidence trigger timing
• Check relative arrival times of trigs at TM
  • Ensure T6 is first, other triggers should arrive 10-20 ns later
• Watch for and correct any trigger related offsets due to different reference time shifts from different triggers
  • Software offsets to be determined and implemented
• Verify desired trigger takes the TDC timing
  • Ensure the intended reference time is being selected by the analyzer (sanity check self timing peaks)
• Verify readout windows are capturing all the data via. raw histograms
  • Use “production_all” replays to do this
  • Primary checks: trigger apparatus, hodoscopes, chambers