February 9, 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)

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Useful Links

• Shift Signup (Read only)
  • Shift Signup

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

Current Status

• Run plan was updated for the x>1 experiment. We will no take 40Ca data in the current kinematic.
• Machine was troubleshoot for almost all day and swing shifts. We had no CW beam from 10 am to 11 pm. But they successfully test high currents in the Hall (70 uA in the C12 single foil).
• Run smoothly with 3He during the owl shift at 40 uA until 5 am when we had SHMS transfer line vacuum alarm followed by SHMS HB magnet interlocked, which was quickly resolved with the help of Jay and Dave.
• Currently finishing the 3He cycle

Current Run Plan

• We will continue with run plan: SHMS at 10 deg, HMS at 35 deg.

Issues/updates

• LN2 levels raised and Jay came to regulate the flow valves.
• There was a constant transient alarm in the HV of the HMS Shower HV (low).
• At 5 am when we had SHMS transfer line vacuum alarm followed by SHMS HB magnet interlocked, which was quickly resolved with the help of Jay and Dave. For future reference, after the incident magnet was not possible to reset. Dave/Jay checked the controls and noted that it looked like the PLC was unresponsive. The PLC was rebooted, and the magnet was successfully reset - the magnet is ramping now.

Current Issues

• Possible issue with 6Li target density. See https://logbooks.jlab.org/entry/4123083

Planned Accelerator

• Accelerator will focus on getting beam to Hall A today.