Difference between revisions of "Cosmics test plans"

Revision as of 18:30, 25 February 2022

Objectives:

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
- Increase the frequency of writing EPICS into the datastream.
- 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
- Put all CDC HV setpoints back to 2125V
- Change the EPICS frequency back to normal.

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~~ Not needed for cosmics.
- Is this for needed for cosmics? (monitoring?)
CDC_occupancy script needs to be adapted for cosmics if we intend to use rootspy.
CDC_amp plugin adapted to make histograms for masked wires. Done.
~~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 and writing only to one file at a time.
- For run 80239 the 19GB files contained 1/3 M triggers each. This file size is ok.
~~When are we doing this?~~
- March 1-14, 2022
Can we write something (epics data) to the evio file whenever the HV is changed? Or increase the epics inclusion rate?

@@ Line 23: / Line 23: @@
 *** TODO: Confirm that the occupancy histogram will work with cosmic events
 *** TODO: Add additional monitoring plots to RootSpy
+** Increase the frequency of writing EPICS into the datastream.
 ** 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
+** Put all CDC HV setpoints back to 2125V
+** Change the EPICS frequency back to normal.
 Strategy: