RC meeting and Run Plan, Thursday, November 18th

Daily_Meetings

RC Meeting Information

RC Daily Meetings are at 3:15pm, remote connection link: https://bluejeans.com/256205934

Current RC: Brad Sawatzky

Accelerator and Hall Status

• 4th pass separator has prevented beam to Hall A since Wed afternoon. Repairs are underway and will continue today. Expectation is to begin beam restoration around noon on Friday
  • SL shifts cancelled for Thurs Swing, Friday OWL. TOs must report as planned.
• GEM layer was successfully replaced yesterday (Wed)
  • 2 bad APV cards identified yesterday and fixed today
  • CODA pedestal configuration and Analyzer DB updates in progress
• Hall has been in Controlled Access since Wed evening with some periods in Power Permit
• A set of cosmics runs were completed with 4 combinations of SBS and BB on/off (while under 'Power Permit')
  • Grinch runs taken with LED pulser enabled
    • NOTE: Some interaction between LED pulser and DAQ complicated this -- kudos to Maria for keeping and eye on this last night!
  • Thresholds and latencies for HCAL and BBCAL updated for good cosmics triggers

Additional details in sub-section notes below.

We are still planning to move to SBS-11 starting Monday, November 22. That will be a ~2 day configuration change in the Hall (Mon/Tue) followed by a Pass change (Hall A 4-->5) on Wed Nov 24.

Pending Issues

• Need to ensure the following before restarting production:
  • HCAL latencies restored [Done]
  • BBCAL and HCal Thresholds restored
  • Confirm new UV layer HVs are in the alarm handler and are being logged/monitored correctly
  • GEM pedestals evaluated and loaded/tested for online pedestal suppression
  • GEM tracking software / analyzer updated and ready?
  • Restore Grinch LED pulser to 10 Hz [Done]

• Upcoming shift schedule issues https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=GMn-2021
  • Will try to arrange for a Hall walkthrough Friday morning for Weibin (and perhaps Konrad)?
  • Several open TO positions starting Nov 24
  • emailed Albert to confirm he is OK for Sat/Sun OWL shifts (schedule indicates trade requested)
    • Bogdan has agreed to pick up those shifts [Done, shift schedule updated]

Subsystem Updates

• Hall Status:
  • Presently in Controlled Access, may move to Power Permit overnight if further tests with fields on are requested.
  • Techs have some work in the Hall Friday morning (doesn't affect BB or SBS)
  • Hall A Walkthrough training planned for 10am for 3 people

• HCAL:
  • HV issues from yesterday have been resolved; HV in good shape
  • BBCAL and HCAL thresholds back to production settings
  • HCAL latencies set back to standard settings
  • HCAL timing investigated (LOG)
    • similar plot requested from FADC timing to compare with 'real' TDC time
    • more to come

• BBCal:
  • First look at runs with different combinations of BB and SBS magnets on
  • general gain matching is looking uniform across the detector
  • will follow up with details on observed impact of fringe field
• Timing hodoscope:
  • Request to continue cosmics
  • working on RF alignment

• Grinch:
  • Pulser resetting has been returned to 10 Hz
  • Study of LED data taken under different BB+SBS conditions underway

• GEMS:
  • J2 layer swapped with UVa U-V layer; 2 faulty APVs addressed
  • Online DB (zero suppression) completed
  • Analyzer DB updates are in progress; DB updated with new geometry, etc completed; Some preliminary track analysis from Cosmics data were done. Basic functionality checks out, but Andrew is working through the punch list.
  • When beam returns
    • Plan for an HV scan on the new layer when beam returns
    • Take short run at low current to check 'best case' tracking

• Beamline:
  • David F is looking at scaler sanity checks with Paul

• DAQ:
  • Alex was going to look at the instability associated with the GRINCH LED
• Replay analysis:
  • Andrew is focussed on the GEM related updates after the layer swap
  • Needs new pedestals for the replaced APVs