RC meeting and Run Plan, Wednesday, June 11th

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RC Meeting Information

Current RC: Andrew Puckett

RC Daily Meetings1:00 PM All Days, via Zoom and in person in the counting house meeting room (2nd floor).

Zoom info

Useful Links

Current Status

  • Controlled access during accelerator down.
    • ongoing work on several DAQ issues.

Run plan for Today

  • Beam restoration after down.
  • When beam comes back: Production on LH2 and continue with GEM HV testing per expert run plan (as described below)
    • PS10=0, PS16=9
    • Config: "GEp-5-3Stream-NoHcalScalers"
    • Thresholds: ECAL = 65%, HCAL = 20% (depending on rate limitation)
    • Four hours runs
    • 5k replay every 15 minutes
    • Monitor Scaler Rates
  • Run plan to understand GEM efficiency:
    • Do most of this plan GEM expert-driven during day/swing until completed.
    • How to run during owl? Default setting: return to 3650/85% and 15 uA (with corrections) until the data can be analyzed and until the special test runs are completed
    • We already have 2 hours of 7 uA data in the bank at current HV settings
    • Tuesday June 10, swing: repeat the conditions of runs 4383-4385 at 7 uA for 2 hours each.
    • Time permitting: go back to 3650/85% setting and run there at 7 uA for 2 h
    • Wednesday day/swing:
      • Repeat the conditions of runs 4382-4385 at [15-18?] uA for one hour each.
      • Take a run with 3650/85% with corrections at [15-18] uA (one hour).
      • Take a run with 3625/85% with corrections at [15-18] uA (one hour).
    • Analyze data. Experts will decide modifications to this plan.
  • GEM run plan from GEM team
    • Begin with 7 uA data, 2 hr runs (Tuesday Swing) COMPLETED
      • 3927 V @ 95% (current setting)
      • 3905 V @ 95%
      • 3881 V @ 95%
      • 3857 V @ 95%
      • 3650 V @ 85% (beginning of Kin3, end here, increase current to 15 uA and run overnight)
    • Move to 15-18 uA (live time dependent?) (Wednesday Swing)
      • 3650 @ 85% w/ corrections overnight
    • Higher current scans, 1hr runs w/ corrections (Thursday day)
      • 3927 V @ 95%
      • 3905 V @ 95%
      • 3881 V @ 95%
      • 3857 V @ 95%
      • 3625 V @ 85%
      • Return to 3650 V @ 85% + corrections, run here until data can be analyzed

Key Updates, Last 24 hours

  • All 7 uA runs for the GEM HV studies were completed on Tuesday swing.
  • The high-current part of the study will be done on Wednesday swing/Thursday day
  • Some problems developed during owl shift:
    • HCAL HV crates lost communication log entry. Rates didn't change and data looked fine so actual HV on the detector was probably fine. Shift kept taking data.
    • DAQ issues (ROC23): log entry. Alex and other DAQ experts troubleshooting in the Hall.
  • IHWP changed to OUT: log entry. Flipper script was executed by shift leader entry. It appeared to run successfully but the automatic log posting didn't work. Paul fixed the flipper script so that it should work for future IHWP changes. (see also: charge asymmetry)

Accumulated Charge

  • Total Accumulated Charge at Kin3 so far: 20.19 C (Goal: 100 C)
  • Total Accumulated Charge at Kin3 since June 4 Swing: 4.66 C

Current Issues

  • ROC23: being worked on in the Hall
  • Lower than optimal beam current due to GEM occupancy/efficiency/signal/noise concerns.
  • APV baseline sagging/broadening: HV test showed a significant reduction of the width at lower gain. Need tracking analysis to check whether the proton efficiency is good at such a gain.
  • Online zero suppression performance (common-mode min values for online zero suppression were changed to zero for the first iteration of averaging until we are ready to deploy ROI readout and histogramming firmware).
  • HCAL calibration/trigger efficiency
  • Slow tracking/analysis difficulty/flying blind: Andrew made some updates to the tracking code over the weekend to try to improve the tracking efficiency/accuracy/speed. Started cooking about 8 C worth of kin. 3 production data (~25,000 jobs). These replays are ~60% complete as of this writing. While it may still be inefficient, the hope is that these replays will at least give us enough elastic ep to iterate on ECAL and HCAL calibrations
  • Uncertaintly regarding GEM gain/HV settings. Tracking efficiency seemed much lower in some of the replays completed after GEM HV increases that took place on or around 5/24. Data seemed dominated by accidentals/false tracks, and no elastic peaks were clearly visible. Initially there was some concern about the trigger timing due to ECAL delay adjustments made around the same time: log entry. However, on further investigation it became clear that the trigger timing was not the issue, and that the tracking analysis is dominated/overwhelmed by false tracks and noise. On further analysis the situation for these runs seems less dire than initially feared. However, the GEM HV studies currently being carried out parasitically should nevertheless help improve our understanding when the data can be analyzed
  • Counting house access to /cache (gateway??) (Helpdesk ticket in)

Shifts

  • Next available: Saturday June 21 Owl TO

Subsystem Updates

  • ECal:

Kip and Jhih-Ying went to Hall and checked 3 channels missing or "finicky" over last week. Two showed nothing on the scope. One showed cosmic pulses. Tried taking pedestals from that slot. Maybe worth looking into. No other major updates.

  • HCal:

Jiwan power-cycled HCAL HV crates that had lost comms.

  • GEMS:

Jacob: low-current data taken last night. ROC23 busy issue. Cu shield install may complicate interpretation of results.

  • CDET:

Reference signal was implemented. Looking at ways to reduce data output.

  • DAQ:

Alex is working on ROC23. Need time to figure out. Still investigating.

  • Analysis

Shift-crew replay script will delete stdout/stderr/log files automatically so the disk where these files are written won't get full.

Beam Restoration Procedure

Beam requirements

  • start off at 5 pass beam
  • intrinsic beam size (at target): 150–600 µm
  • raster size: 2 mm X 2 mm
  • During kin#3 SBS magnet will be at 1762.23 Amp, the corrector magnets at -80A for all.
  • production run @ 15 µA for now
  • For later
    • production beam current : 25-30 µA
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