RC meeting and Run Plan, Wednesday, June 18th

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RC Meeting Information

Current RC: Nathan Heinrich until 1:30pm, Silviu Covrig Dusa after 1:30pm

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

  • Completed beam studies for MOLLER modulation
  • Production

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

Beam Studies Today

  • Restore should start at 1pm, expected beam at 2pm

Key Updates, Last 24 hours

  • Got Beam back during owl last night. We got about 4 hours of production over night before beam studies started.
  • ECAL crew finished and implemented calibration. They will be testing it today when beam comes back.
  • The Hot Channel fix yesterday appears to have reduced the trigger rate in the ECAL from 2kHz to 1.4kHz.

Accumulated Charge

  • Total Accumulated Charge at Kin3 so far: 24.88 C (Goal: 100 C)
  • Total Accumulated Charge at Kin3 since June 11 Swing: 4.7 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:
    • ECAL crew finished and implemented calibration. They will be testing it today when beam comes back.
    • The Hot Channel fix yesterday appears to have reduced the trigger rate in the ECAL from 2kHz to 1.4kHz.
  • HCal:
    • Waiting on some replays to finish to finalize the calibration
  • GEMS:
    • Discussion about raising baseline of APV, hopefully get room for higher rate.
  • CDET:
  • DAQ:
  • Analysis

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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