Cosmics test plans

Objectives:

• Test drive the AIEC software
• Demonstrate that the CDC gain is stable

Schedule:

• 2022-02-25 Fri. - Test fully automated CDC HV control
  • Notify Beni and Mark Stevens of intent to run test on Fri. throughout the day with low voltages (~20V-30V)
  • Modify control script to subtract 2100V from suggested setting before applying
  • Create cronjob under hdops account to run script every 5min.
  • Monitor system occasionally throughout the day so that it runs for 4-6hrs
• 2022-03-01 Tue. - Start system
  • Notify halld@jlab.org that the test is starting and provide contact info.
  • Verify control script no longer subtracts 2100V from suggested setting
  • Confirm CDC gas is flowing and bubbler is correct
  • Confirm CDC alcohol level is good
  • Confirm BCAL chiller is on
  • Turn on all CDC HV channels
  • Turn on all BCAL HV,LV channels
  • Start DAQ system and confirm that cosmic trigger rate is correct (~100Hz?)
    • TODO: Get correct DAQ configuration details from Sergey
  • Set cronjob under hdops account to run script every 2min. and watch for a few cycles
  • Check CDC occupancy in RootSpy
    • TODO: Confirm that the occupancy histogram will work with cosmic events
    • TODO: Add additional monitoring plots to RootSpy
  • If all seems to be functioning, reset the crontab to run the script once per hour
  • Make HDLOG logbook entry
  • Monitor progress regularly for 2 weeks. Start new runs if needed.
• 2022-03-14 Mon. - End test

Strategy:

• Designate 2130V as the nominal HV for cosmics, to raise more hits above the noise, but keep 20V headroom for the AI.
• Tell the AI that the HVB current is constant at 9uA so that it can operate within the range of its trained data
• Use 1V steps and 1h runs
  • Starting new run every hour for 2 weeks may not be feasible. Devise scheme to break up long runs?

Needs:

• AIEC software to read epics and wait for a stable period before calculating the gain and setting the HV
  • What determines "stable"?
  • Who?

• Method for scaling the HVB current to what it would be at the nominal HV before running the AI - will not be needed for cosmics but will be needed for CPP.
  • Is this something that could be tested during cosmics run? (yes=implement, no=defer)

• Script to project dE/dx for 4-10 GeV tracks, fit it and calculate the gain factor
  • Is this for needed for cosmics? (monitoring?)

• Code to set whole quadrants to same value(cdc_tool.py)

Questions:

• Do we need to force a B field in the reconstruction sw (wait for Simon to answer)
  • Simon reported progress on straight track reconstruction (email to David and Naomi Feb. 24th)
• Full DAQ or standalone DAQ?
  • Ask Sergey for configuration with only CDC, BCAL
• When are we doing this?
  • March 1-14, 2022