RC meeting and Run Plan, Tuesday, June 17th

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RC Meeting Information

Current RC: Nathan Heinrich

RC Daily Meetings1:00 PM All Days, via Zoom and in person in the counting house meeting room (2nd floor).
No meeting planned for the weekend, Unless something important comes up

Zoom info

Useful Links

Current Status

  • Maintenance Day, then back to production soon as we get beam back
  • Tomorrow beam studies for Moller

Run plan for Today

Production on LH2

    • 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
  • Work scheduled for today's Maintenance Day
    • Don would like to stack some lead shielding -Not Done, waiting until next week-
      • added concert blocks as stop-over, replaced offending power strip. Should be able to restart remotely.
    • GEMS would like to replace MPC Card on GEM bunker -Completed-
    • A few items need to be surveyed to bring out of the Hall.
    • ECAL diagnoses and fixing -Completed-

Key Updates, Last 24 hours

  • Last night we had network problems with both the GEM and ECAL HV supplies.
  • The GEMs required an access to fix, done at ~9pm last night.
  • It was decided that we would wait until today to fix the ECAL because there was only 12 bars affected.
  • This morning we went into controlled and work began in the hall
    • I believe that we have completed all the work that we needed to do today already.

Accumulated Charge

  • Total Accumulated Charge at Kin3 so far: 24.6 C (Goal: 100 C)
  • Total Accumulated Charge at Kin3 since June 11 Swing: 3.6 C

Current Issues

  • 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

  • Full up for until August at the moment :)

Subsystem Updates

  • ECal:
    • Last nights issue with HV card was not actually off. Rebooted card, al good.
    • Inspected Hot channels, discovered that some cables were swapped. Fixed this issue hopefully.
      • Trigger rate should go down, overall improvement. Still needs to be monitored. See log entry.
    • ECAL and HCAL Calibration finished. Waiting on spokespeople's approval to implement.
  • HCal:
    • Same Calibration is ready. Want to wait until analyzed low threshold data.
  • GEMS:
    • Last nights communication issue, decided to remotely power cycle. This was unsuccessful, had access as 2/3 of GEMs affected.
    • Today, investigating MPD issue, got 1/2 of the channels back on offending card. Trying to recover the rest. Effecting layer 13 module 1.
    • Hoping to be done at 2:00, but will leave as soon as the tech are called to unlock the SBS.
  • CDET:
  • DAQ:
    • There were DAQ, Accelerator people are starting to wonder why our DAQ is so unreliable.
      • Both Starting runs and GEM related Crashes.
  • Analysis
    • Final set of problematic Jobs are done, and have good output. 40M events, ~60K elastics.
    • Launched the GEM HV Study jobs, should take 1 and 1/2 days to finish.

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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