RC meeting and Run Plan, Friday, April 4th

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RC Meeting Information

Current RC: Bogdan Wojtsekhowski

RC Daily Meetings are at 1:30 (pm) via Zoom and in person in the counting house meeting room (2nd floor).

Useful Links

Accelerator

  • Accelerator delivered beam to Hall C, tuning continue.
  • At 11am today CEBAF is OFF due to cooling water leak which used for the power supplies, https://logbooks.jlab.org/entry/4348041
  • Hall A start likely Tuesday, 4/8, defined by target cooldown schedule.

Completed Work

  • Beamline vacuum leak - fixed by D.Meekins
  • CDet: DAQ made good progress
  • GEM: DAQ taking data with HCAL

Work planned/ongoing in/around the Hall

  • Target preparation
  • DAQ development
  • Detector testing

Shifts

  • Shifts canceled through Tuesday OWL (4/8)

Status of Subsystem

Current Issues

  • Beam line: https://logbooks.jlab.org/entry/4347555
  • Trigger latency in each DAQ esp. CDET
  • Experts to update wiki for shift takers (DAQ/GEM/CDET/HCAL/ECAL/50k replay)
  • Detailed run plan (PI meeting on Monday)
  • NEW time for RC meeting: 1:30 pm for Tu, Th, Fri and 1pm for Mo and We.

Beam Restoration Procedure

Once we have beam

Beam requirements

  • start off at 3 pass beam
  • intrinsic beam size: 150–500 µm
  • raster size: 2 mm X 2 mm; using carbon hole target with 5mm hole to checkout raster size
  • For later
    • production beam current : 50 µA
    • run plan forthcoming

SBS Magnet

  • First the first 3 pass, SBS magnet will be at 41.5% of maximum
  • corrector magnet setting for each pass passed to Yves Roblin