RC meeting and Run Plan, Monday, June 16th

From SBS wiki
Jump to: navigation, search

Back to the calendar

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

  • Production running
  • Tuesday will be a maintenance day, so any work in the hall should be planned for then. Please let me know so I can coordinate.

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
  • 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) COMPLETED
      • 3650 @ 85% w/ corrections overnight
    • Higher current scans, 1hr runs w/ corrections (Thursday day) COMPLETED
      • 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
      • 1 hour run with HV corrector script off to test effect of copper shielding
  • Don would like to stack some lead shielding
  • GEMS would like to replace MPC Card on GEM bunker
  • A few items need to be surveyed to bring out of the Hall.

Key Updates, Last 24 hours

  • During day shift yesterday there was a problem where a JT valve was stuck open in Hall C. This caused the ESR unit to struggle to deliver cooling to the other halls. We got the least of it, as our target was only affected for about an hour.
  • At around 10pm Don needed to do an access to power cycle the power strip connected to the ECAL control units, as it had stopped responding.
  • I have been informed that Tomorrow there will be a maintenance day, we have an opportunity to do work in the hall. Please let me know if there is any work that needs doing, I'd like to keep the hall in controlled.

Accumulated Charge

  • Total Accumulated Charge at Kin3 so far: 23.7 C (Goal: 100 C)
  • Total Accumulated Charge at Kin3 since June 11 Swing: 2.7 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:
    • Still waiting for jobs to do both ECAL and HCAL Calibration. 1 ECAL channel tripped over the weekend, but restarted fine
    • Might want to access tomorrow to check some channels
  • HCal:
    • Still waiting for jobs to do both ECAL and HCAL Calibration.
  • GEMS:
    • Just planned access for tomorrow.
    • HV study waiting on Andrew to give green light to replay. Should be soon.
  • CDET:
    • No hardware changes, have cuts and stuff to send to Andrew. Thinking about calibrations and online analysis.
  • DAQ:
    • Nothing to add.
  • Analysis
    • Waiting on Andrew, then we'll start cooking the data.

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
Retrieved from "https://sbs.jlab.org/wiki/index.php?title=RC_meeting_and_Run_Plan,_Monday,_June_16th&oldid=8552"