RC meeting and Run Plan, Tuesday, May 6th

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RC Meeting Information

Current RC: Jiwan Poudel

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

• Wein Angle changed on Wednesday (April 30).
• 5th pass separation completed on Wednesday (April 30) https://logbooks.jlab.org/entry/4367983
• MCC and Optics Experts are continuously working to get beam ready for Hall-A (priority hall)
• Beam tuning for Hall-A in ongoing (from swing shift yesterday), No estimation yet of getting CW beam to Hall
• Accelerator Maintenance Day tomorrow (beam goes OFF at 6:30 am)

Work in Hall during Configuration Change

• SBS and HCAL new kinematic position (SBS 2 cm downstream)
• Beam line / corrector#1 braces fixed
• ECAL movement to new kin#3 position
• SBS lead wall reinstalled

Readiness of Hall before getting beam

• Completed Checklist by Radcon
• Complete Hall Checklist before closing the hall
• Target cooled and ready on Monday
• Swept hall by MCC around 4 pm on Monday
• Escorted access on swing shift Monday to power cycle corrector magnet PS

Items to keep an eye

• Target chamber pressure (need another replacement pump)
• SBS magnet current stability

Shifts

• TO and SL required (Shift are filled for May)

Run plan when MCC is ready to send beam back

• Follow beam restoration procedure to the Hall
• Start with 5 uA proceed to 20 uA
• For later
  • production beam current : 50 µA
• Moller run (Don is not available this week)
• Carbon foil straight through run (1 - 3 uA for an hour)

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
• raster size: 2 mm X 2 mm
• During kin#3 SBS magnet will be at 1762.23 Amp (from Bogdan, provided to MCC to keep in the binder)
• corrector magnet setting for each pass passed to Yves Roblin
• production run @ 20 µA for now

Hall Access request for tomorrow (Maintenance day)

• GEM
• CDET
• ECAL

Updates on Subsystems

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