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)

• Zoom remote connection information:

 Join ZoomGov Meeting
 https://jlab-org.zoomgov.com/j/1607100885?pwd=ZFBsRTFsYm5Zb0laZ0tyZXNjcEE0QT09
 Meeting ID: 160 710 0885
 Passcode: 595071
 One tap mobile
 +16692545252,,1607100885# US (San Jose)
 +16468287666,,1607100885# US (New York)
 Dial by your location
       +1 669 254 5252 US (San Jose)
       +1 646 828 7666 US (New York)
       +1 669 216 1590 US (San Jose)
       +1 551 285 1373 US
       833 568 8864 US Toll-free
 Meeting ID: 160 710 0885
 Find your local number: https://jlab-org.zoomgov.com/u/ab2CekLXgQ

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. https://logbooks.jlab.org/entry/4126814 https://logbooks.jlab.org/entry/4126914
• There was a constant transient alarm in the HV of the HMS Shower HV (low). Dave Moved channel to new HV output. https://logbooks.jlab.org/entry/4126876 https://logbooks.jlab.org/entry/4127173
• 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. https://logbooks.jlab.org/entry/4127135 https://logbooks.jlab.org/entry/4127140
• Abhyuday Sharda noted Calorimeter Pedestal Monitoring showing possibly uncalibrated PMTs in the online replay GUI. I checked run 6412(~300 runs before) and the odd PMT voltages weren't there. It could be that these PMTs weren't calibrated for the current kinematic setting but I'm not sure. Attached is the screenshot for run 6692. https://logbooks.jlab.org/entry/4127121

Current Issues

• Possible issue with 6Li target density. See https://logbooks.jlab.org/entry/4123083
• Dave noticed when Hall A was coming back on that our beam energy was shifting a little (<1 MeV) when Hall A turned on/off. He spoke with Kiarra and MCC and she said this is not a new issue. It looks like the Hall A and C beams are not fully overlapping in the arcs (they use the position in the arc for the energy locks), so when Hall A turns on or off, it looks like the position in the arc has changed, which makes the energy lock take action. https://logbooks.jlab.org/entry/4127193

Planned Accelerator

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