Cosmics test plans

From epsciwiki
Revision as of 15:48, 4 March 2022 by Tbritton (talk | contribs)
Jump to navigation Jump to search

Cosmic Run Notes:

Tuesday March 1st 6:39pm : CDC turned on and run started DAQ configuration issues automated system running (image)

Wed: Temperature found to be less controlled, temps on edge or outside model training. Temperature fixed to 299.25 "ideal_gcf": 0.15292712143476878

Naomi not happy with the controls. rec_scale changed to 15 min (15) under the assumption there was a build up of David finds and fixes bug in cdc_tool.py which caused the setting to take more than the original rec_scale of 5 min. Once fixed rec_scale reset to 5 new: "ideal_gcf": 0.15240693525146817

Thursday: Naomi not happy with the recommended HV given the pressure.

control system reinitialized. "ideal_gcf": 0.15202469799843948

Naomi notices the default pressure is wrong and corrects it

"ideal_gcf": 0.1523301284531037

11:45am Thomas finds bug in initialization not respecting the fixed values. Bug fixed. "ideal_gcf": 0.1482670653025542

12:21pm Torri starts a new run post bug fix (Run 90716)

1pm-ish beam current returning N/A forcing system to report bad epics. This crashes the model and program. Thomas routes around this N/A as beam current isn't being used and protects the model from this. It is also logged in the DB now

2:05pm EPICS has died (more N/A) across the board. Program no longer crashes but, as expected, the CDC is no longer under control of the AI

epics down between 13:13:13 -> 14:17:14 the pressure didn't change during this period so no harm done to the run. discussed a fail safe mechanism

Friday pretty big pressure change. HV following as expected.


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
    • 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?
Retrieved from "https://wiki.jlab.org/epsciwiki/index.php?title=Cosmics_test_plans&oldid=1581"