RC meeting and Run Plan, Sunday November 21th

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 remains in Controlled Access, but is ready for beam (see 4th pass separator comments below).
• GEM and Grinch experts have made a few short accesses for opportunistic debugging while we're down.

• 4th pass separator has prevented beam to Hall A since Wed afternoon.
  • RF Separator work was unsuccessful as of 3pm Friday. PD Update: 4th Pass IOT
  • Work on the 4th pass IOT has continued over the weekend. However, latest word is that no solution will be available until at least late-day shift on Monday (and that is still a little unclear). So, stay tuned...
  • There will be an interruption to all Halls when OPS is ready to try bringing the 4th pass separator back online.

Plans for the next few days

• Hall A will move to Restricted Access at ~7am Monday morning for the configuration change to SBS-11
  • We will need to ensure that HVs are off and that it is safe for Techs to work on BB and SBS.
  • The change-over will happen over Monday and Tuesday and will require considerable work around the detector stacks and pivot
  • Hall A Technical staff has priority in that area
  • RadCon, Survey & Alignment are contacted and ready to go
  • We plan to complete the work by the end of Day shift on Tuesday.
• Depending on how stable the beam is to Hall C over the weekend, we are hoping to shift the pass change to Tuesday Swing (instead of Wed Day).
  • Final decision on this will be made on Monday
  • 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)

• Beam restoration to the Hall
  • Start with Sieve IN or OUT?
  • 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
• Low current GEM runs (?)
  • 1 uA on LH2
  • Take ____ 5 min long runs with different GEM HV settings for quick voltage scan (needs details)
  • Take 1 30 min long run with the all GEMs at standard voltages to support track reconstruction checkout
• Move to Production Running cycle
  • [UPDATE ME]

• Upcoming shift schedule issues https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=GMn-2021
  • Several open TO positions starting Nov 24
  • 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

• BBCal:
  • New HV settings made for upcoming BB/SBS on/off settings
    • Contact BBCal experts to load these if/when needed
  • Corrected BBCal - HCal timing plots (histogram definition errors in prior plots, now fixed)
    • plots make more sense, but more clean-up cuts would likely help -- work continues
  • working on cluster optimization (algorithm modifications in analyzer)
  • Provokar will be out of town in the near future (will be posted on the wiki)
    • Has been working on a number of 'how-to' scripts for experts (Arun, Sebastian, etc)

• 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 through the weekend

• GEMS:
  • GEM HV scan using cosmics will be worked on over the weekend
  • 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

• Beamline:
  • indications that the 'clock' rate used to compute rates from scaler data in each scaler crate (SBS, LHRS) need to be checked
    • Clock value in analyzer likely off by a little in at least one arm
    • David F will go down into the Hall and explicitly measure the rates
    • Resolved: Clock signal rates measured here: https://logbooks.jlab.org/entry/3946822
  • David F is looking at scaler sanity checks with Paul

• DAQ:
  • General DAQ stability?
    • Frequent crashes at end of run
    • New runs frequently do not start successfully and require cycles of reset/config/reset
  • Alex reports that the LHRS scalers are not gated by the Trigger Supervisor -- will look into it
    • Bob M. and David F. have responded and will be taking care of this
  • ET system issues?

• Replay analysis:
  • GEM work is ongoing
  • Eric working on end-of-run report file output along with Dave F.

• Counting House Computer requests
  • Streamline access to common tools (halog, go_* scripts, etc)
    • 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