RC meeting and Run Plan, Monday November 22th

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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

  • Hall A is in Restricted Access and the configuration change to SBS-11 is underway -- will continue through Tuesday DAY shift
    • We need to ensure that HVs are off when the Techs are working. They can be turned on for tests during SWING/OWL (check with the RC and make clear Halog entries please!)
    • Downstream beamline bled up -- holding well
    • Hall A Technical staff has priority during changeover
  • GEM and Grinch experts plan to continue opportunistic debugging while we're down.
  • 4th pass separator repairs are ongoing
    • PD Update: 4th Pass IOT
    • This primarily impacts Hall C at this point, but there will be downtimes associated with reintegration and tuning once repairs are completed.

Plans for the next few days

  • The pass change has tentatively been moved to Tuesday Swing/OWL (instead of Wed Day) -- assumes reasonable Accelerator uptime Mon/Tuesday
    • Final confirmation of pass change date will be Tuesday morning RC meeting, but we will proceed under the assumption that pass change will occur Tuesday SWING/OWL.
    • Shift Leaders have been notified that their shifts are cancelled through Tuesday OWL shift.
    • Tuesday DAY shift personnel should come in as planned. The Tuesday DAY shift leader is free to arrive at noon if he would prefer.

Additional details in sub-section notes below.

Run Plan for When Beam Returns (Tuesday Evening or Wednesday)

The SBS-11 Runplan (PDF) document is on the DocDB.  Please update the file there if needed.

This runplan is a draft.  Stay tuned for changes (and updates to the ??? below.)
  • Take BBCal cosmics data with magnets on to get HV settings established as soon as Hall can be locked up
  • Beam restoration to the Hall
    • Start with Sieve IN
    • Ensure target is OUT
    • GEM HVs OFF
    • SBS, BB OFF
    • All other systems should be ready to go
  • After initial steer-up into Hall is complete
    • Verify beam profile with Harp scans
    • Ramp BB and SBS to production currents
    • Determine raster size and position on target
CONFIRM: Production SBS current is 2100A (100%) or 1785A (85%)?
  • Initial threshold settings for BBCAL and HCAL
    • [FIXME] BBCAL threshold 0.5 GeV (??? mV)
    • [FIXME] HCAL threshold ??? (??? mV)
  • Turn GEM HV back ON; Ensure other detectors are ready to go.
  • Optics Runs for SBS-11
    • Zero Field Alignment
    • SBS OFF, BB OFF, Sieve IN
    • single C foil target
    • [FIXME] BBCAL threshold 0.5 GeV (??? mV)
    • I = 5--10 uA
    • 60 min of beam on target
    • Vertex and Angle Reconstruction 1/2
    • SBS ON (1785A pos.), BB ON (750A neg.), Sieve IN
    • 5-foil Optics target
    • [FIXME] BBCAL threshold 0.8 GeV (??? mV)
    • I <= 20 uA
    • 60 min of beam on target
    • Vertex and Angle Reconstruction 2/2
    • SBS ON (1785A pos.), BB ON (750A neg.), Sieve IN
    • 4-foil Optics target
    • [FIXME] BBCAL threshold 0.8 GeV (??? mV)
    • I <= 20 uA
    • 60 min of beam on target
  • Escorted Access to take Sieve OUT (needs trained personnel!)
  • Low current GEM runs
    • SBS ON (1785A pos.), BB ON (750A neg.)
    • [FIXME] BBCAL threshold 2.0 GeV (??? mV)
    • 1 uA on LH2 target
    • Take ____ 5 min long runs with different GEM HV settings for quick voltage scan
      • [FIXME] GEM HV Settings TBD for efficiency scan
  • GEM Rate Study
    • Ensure GEM HVs are back at standard settings
    • SBS ON (1785A pos.), BB ON (750A neg.)
    • [FIXME] BBCAL threshold 2.0 GeV (??? mV)
    • LH2 target
    • I=1 uA ; take 1 30min run
    • I=15 uA ; take 1 30min run
    • I=5 uA ; take 1 30min run
    • I=1 uA ; take 1 30min run
  • Move to Production Running cycle
    • SBS ON (1785A pos.), BB ON (750A neg.)
    • [FIXME] BBCAL threshold 2.0 GeV (??? mV)
    • [FIXME] HCAL threshold ??? (??? mV)
    • Goal: HCAL calib
      • LH2 Target; I = 15uA
      • 10M triggers (nom. 1 hr)
    • Goal: Production
      • LD2 Target; I = 8uA
      • 40M triggers (nom. 4 hr)
    • Goal: HCAL calib
      • LH2 Target; I = 15uA
      • 10M triggers (nom. 1 hr)
    • Goal: Production
      • LD2 Target; I = 8uA
      • 30M triggers (nom. 3 hr)
    • Goal: Production/Dummy
      • Dummy Target; I = 15uA
      • 2.5M triggers (nom. 0.5 hr)
  • This nominally takes us to Friday 11/26 in the SBS-11 Runplan (PDF) document. Progress will be reassessed and subsequent runplan updated as needed.
  • Upcoming shift schedule issues https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=GMn-2021
    • Several open TO positions starting Nov 26 (Bill H. picked up shifts on 24,25)
    • John Arrington's Tuesday Swing shift is marked 'Trade Requested', but he's been confirmed.
    • Shift Leaders have been notified that their shifts are cancelled through Tuesday OWL shift (during config change)
    • Tuesday DAY shift personnel should come in as planned. The Tuesday DAY shift leader is free to arrive at noon if he would prefer.

Reminders / Notes

  • Role sharing between SL and TO was discussed
    • TO should support the SL wherever possible while still keeping primary focus on the target
      • Beam Time accounting; Shift Checklist tasks are low-hanging fruit
      • Suggestion is to have TO start/stop runs and maintain the Run Log spreadsheet?
  • Run plan communication / documentation will be 'officially' documented on the Daily_Meetings#RC_Meetings page
    • Don has made the Run Coordinator 'Run Plan / Report' page more visible on the wiki (and nicely formatted it)

Subsystem Updates

  • HCal:
    • HCAL timing plots are being updated/corrected
    • Wiki instructions have been updated
    • Working on clustering in SBS offline
    • Will be using old HVs for SBS-11 startup
  • BBCal:
    • New HV settings made for upcoming BB/SBS on/off settings
      • Contact BBCal experts to load these and monitor BBCal performance during beam restart
  • Timing hodoscope:
    • working on RF alignment
    • HV instructions for hodoscope are in the wiki (and also re-posted to halog)
  • Grinch:
    • Study of LED data taken under different BB+SBS conditions underway
    • Maria/Todd/Bradley will be taking some more opportunistic LED pulser data tonight (Monday)
    • Status update to Halog was requested
  • GEMS:
    • GEM experts will be monitoring the gas bottles over the holidays (should be fine, but extra eyes will help)
    • GEM HV Cosmic Scan Status
      • No analysis of these runs yet(?)
    • Likely still a good idea to do a (quick) 'voltage scan' with beam as well. Details TBD
      • This will be a GEM-expert driven program.
    • Work continues on calibrating/understanding the new GEM layer
      • Andrew reports things seem to be generally working, but some issues still being worked on
      • Identified an incorrect guess/assumption for the z-location. When corrected, that significantly improved tracking performance (the steep incident angle for cosmics makes tracking particularly sensitive to the z-location of the layers)
      • Still investigating the following: large number of fake tracks; possible issues with pedestal suppression, or perhaps indication of cross-talk; unclear...
    • GEM "HV-off" cosmics data are on disk -- not clear if it has been looked at (may help disentangle potential cross talk sources)
    • Some confusion over an apparent latency shift for the new UV layer?
      • Source of shift is not understood
      • New data taken with a shifted latency in DAQ configuration, but still to be looked at
    • Some confusion over a large latency shift occurred after the 2 APVs in the UV layer were fixed
      • Run 12131 (Friday 1pm) shows this shift, old timing was present in run 12101 (Thursday morning). May have shifted around the time of the pedestal run?
      • Alex, Andrew, and other DAQ/GEM experts will try to nail down the timing and cause of this shift
  • Beamline:
    • Clock signal rates measured here: https://logbooks.jlab.org/entry/3946822 [Resolved]
    • L-HRS scaler gate fixes and notes: [1], [2] (Bob. M)
      • Notes that the ET events have not been checked recently
    • David F is looking at scaler sanity checks with Paul
  • DAQ:
    • CODA ET library updated Monday afternoon
      • Alex will do some stress tests on DAQ while the Hall is open
    • General DAQ stability?
      • Frequent crashes at start or end of run
      • New runs frequently do not start successfully and require cycles of reset/config/reset
      • Could be ET issue, but some failures tied to VTP crate as well
  • Replay analysis:
    • GEM work is ongoing (see above)
    • Eric working on end-of-run report file output along with Dave F.
    • Updates to BCM Scaler Database Files (David F.)
      • Fixes some duplicate variable names in the TSsbs tree


  • Counting House Computer requests [Ole will be looking into a number of these items]
    • analyzer updated on hadesk machines
    • Streamline access to common tools (halog, go_* scripts, etc)
      • Perhaps get them in a common bin/ directory and added to $PATH?
    • Firefox configurations differ quite a bit depending on user@host
      • Update common configuration to improve useful bookmark toolbar links
      • halog, elog, SBS wiki, Shift crew help, etc
      • 'New' tabs default to something useful, etc
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