RC meeting and Run Plan, Friday, May 16th

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RC Meeting Information

Current RC: Arun Tadepalli

RC Daily Meetings on Mondays and Wednesday are at 1:00PM, and Tuesdays, Thursdays, and Fridays at 1:30PM, via Zoom and in person in the counting house meeting room (2nd floor).

Zoom info

Useful Links

Accelerator

  • Beam recovery procedure in progress

Hall-A

Beam permit

Status of Hall A

  • We backed out of the Moller measurement due to Q4 issues (https://logbooks.jlab.org/entry/4375927). The Moller group will wait to see what DC power has to say about the Q4 issues and we will reschedule another attempt sometime next week (https://logbooks.jlab.org/entry/4375942). After that, unfortunately, due to a broken compressor in the Hall A beam dump nitrogen system, we couldn't get any beam during swing and owl shifts. Facilities was able to address the issue (https://logbooks.jlab.org/entry/4376064) and we are currently waiting for MCC to get a go ahead to send us the beam. The plan is to get back to production running at 10 uA, revisit the stability and capability of our detectors and then move to a higher beam current (15 uA?) if possible.

Access requests and special runs

  • Need to survey and get an FADC out of the hall.
  • Moller measurement will be scheduled sometime next week

Updates on Subsystems

  • ECal:
  • HCal:
  • GEMS:
  • CDET:
  • DAQ:
  • Analysis Software


Items to keep an eye on

  • Target chamber pressure (Lawrence is looking at a spare turbo pump, we might get one from Hall-B): Old
  • SBS magnet current stability/overheating test: Plane dropped

Shifts

All set for this week


Run plan when MCC sends beam back

 * 10uA beam until next decision to go to a higher beam current (15 uA)
  • For higher current up to 50 uA, MCC needs to be notified a few days early


Beam Restoration Procedure

Beam requirements

  • start off at 5 pass beam
  • intrinsic beam size (at target): 150–500 µm (<600 &micro m is also acceptable)
  • 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 @ 5-10 µA for now
  • For later
    • production beam current : 50 µA
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