January 18, 2023

RC Meeting Information

RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting house meeting room (2nd floor)

• Zoom remote connection information:

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 Meeting ID: 160 710 0885
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Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Current Status

• Accelerator maintenance day.
• Opportunistic access for Hall C walkthrough, SoLID test (Jimmy et al), SHMS Q1 power supply check for the dead fan by Ellen, SHMS HB temperature sensor and ice accusation check on the SHMS by Heidi.
• Plan is to lock the linacs up around at the end of the shift.
• Positron data taking at HMS 35 degrees is complete. SHMS took electron data at -9.2 GeV and 10 deg with loose HV detector configuration parasitically.
• Finished setting 1 of high Q2 electron data taking in the HMS (-4.08 GeV and 35 deg). SHMS kinematics remains the same but some of the pre shower blocks are turned off.
• Started setting 2 of high Q2 electron data taking in the HMS (-3.57 GeV and 35 deg) during the owl. Data taking with 4He is half way through.

Current Run Plan

• Resume data taking at the setting 2 of high Q2 electron data taking with 3He, Al dummy, and 12C targets.
• 10 different HMS settings in total. Mostly with 3He, Al dummy, 12C, and 63Cu targets.

Notices in Effect for Shift Crew

• Beam current for the Helium targets is limited to 40 uA!
• Always let the RC know with questions and any issues that require expert help. https://logbooks.jlab.org/entry/4109412

Current Issues

• Accelerator issues to provide high beam current to Hall A and C.
• Lowering the Hall C current to reduce beam trips in a way the split between Hall A and C current is not in equitable way.