RC meeting and Run Plan, Saturday, May 10th

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RC Meeting Information

Current RC: Asar Ahmed

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

• Shift Schedule
• Hall A Logbook
• MCC White Board
• Hall A Safety Docs
• Run Coordinator Wiki

Accelerator

• Many issues reported in today's meeting: Machine instability, current instability, oscillation in orbit motion (1.5m frequency), water leakage in tunnel
• Could deliver physics beam for 3h on Carbon, and 1:20h for LH2
• ARC A box supply trip
• Expeting to send beam by 1:00PM, if fail on DC power for magnets, can down accelerator until Monday

Status of Hall

• Beam check completed
• Straight through data on thin Carbon for 3h.
• 1:20h data on LH2
• Beam position on the target is fluctuating

Updates on Subsystems

• ECal:
  Calibration requred
• HCal:
  Calibration requred
• GEMS:
  FT L1
• CDET:
  Calibration requred
• DAQ:
• Analysis Software

Access request Today

• None

Items to keep an eye

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

Shifts

• TO and SL required (Shift are filled for June 10)

Run plan when MCC sends beam back

• Follow beam restoration procedure to the Hall
• Carbon foil straight through: SBS magnet OFF run (1 - 3 uA for two hour)
• Production: Needs new update

 * 5uA beam for 8 hours
 * 10uA beam for 8 hours

• For higher current upto 50 uA, MCC needs to notified a few day early

Beam Restoration Procedure

• Use new "cross target" (1x1 mm "+" shape) for beam restoration as described in https://sbs.jlab.org/wiki/index.php/HOW_TOs#Beam_Recovery_Procedure_for_GEp

Beam requirements

• start off at 5 pass beam
• intrinsic beam size (at target): 150–500 µm (how high can be acceptable??)
• raster size: 2 mm X 2 mm
• During kin#3 SBS magnet will be at 1762.23 Amp (copy provided to MCC to keep in the binder)+ corrector magnet setting will be scaled down for this current
• production run @ 5-10 µA for now
• For later
  • production beam current : 50 µA