December 19, 2022

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

• Shift Summaries
  • Day 12/18
  • Swing 12/18
  • Owl 12/19

• Today (12/19)
  • Beam taken away at 7am as scheduled to begin the scheduled accelerator down.
  • Hall C in Restricted Access.
  • SHMS and HMS magnets ramped to zero.
  • SHMS and HMS HVs are off.
  • Dave Meekins arrived at 8:30AM to begin warming up the target.

• Yesterday (12/18)
  • Shortly after (12/18) Owl shift started, there was another PSS communication failure and Hall C suddenly dropped to restricted access.
    • The tech on-call wasn't able to restore the system.
    • The expert arrived at 8AM and made hardware replacements.
    • Hall C back to beam permit at 12:30 PM.
    • All hardware related to communication interface in the hall has been replaced. Radiation damage is the suspect.
  • Smooth running on Setting 2 of high x HMS 35 degrees until beam was taken away at 7am as scheduled.
  • A bit more than half of Setting 2 is complete.

Current Run Plan

• Is there any work that needs to be coordinated by RC today?
  • (I don't think so)
• No Hall C meeting today.

Current Issues

• Beam Energy Measurement
  • I was assured at the 8:00AM meeting today that they are taking the incident seriously and are still investigating.
  • Doug mentioned that they are considering reporting it as an "incident" to the DOE in part due to all the equipment damage.
• PSS issues.
  • Should be fixed now with the new hardware.
  • BUT it seems very wired to me that the failure mode is to drop to restricted access.
• Unser
  • Front end electronics suspected to be damaged from the radiation from the beam energy measurement.
    • (Might be a good idea to find some evidence of this with the scalers).
  • Dave Mack has been coming up with a plan to debug it and will work on it before we come back in January.
• Radiation Damage in general.
  • We should be on the lookout for other hardware that may have been damaged by radiation.

Special Requests

• Happy Holidays!