February 9, 2023

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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

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

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 Accesses to the Hall

Planned Accelerator

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

Special Requests