March 5, 2024

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RC Meeting Information

Current RC: Iuliia Skorodumina

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

Useful Links

Summary

Yesterday (03/04) we did NPS setup change for the new kinematic setting KinC_x25_4. We went to Controlled access early in the morning and the work in the Hall commenced (https://logbooks.jlab.org/entry/4259689). In parallel, Bob Michaels and Hanjie were doing some scalers tests for the DAQ (https://logbooks.jlab.org/entry/4260659) and Julie and the students were troubleshooting bad NPS channels (https://logbooks.jlab.org/entry/4260683 and https://logbooks.jlab.org/entry/4260885).

We went back to Beam permit in the second half of the Day shift, checked rates on LH2 and LD2, and proceeded to production in KinC_x25_4 kinematics. We are going to stay in this setting up until the pass change on March 11th.

We took data smoothly overnight with a few minor issues that included DAQ errors and a fan frequency drop for loop2, which was addressed by the expert (https://logbooks.jlab.org/entry/4261313). Also, for the past week we had a few weird encounters of sudden drops in the target heater power that recover by themselves (the latest was overnight https://logbooks.jlab.org/entry/4261277 and the following logentry is from last Saturday https://logbooks.jlab.org/entry/4259365).

Around 8am HMS dipole and Q3 tripped again (which again happened a few minutes after both Hall B magnets tripped). At the moment, both HMS magnets have already recovered and Dave Gaskell is doing the Moller measurement.

Day shift summary (https://logbooks.jlab.org/entry/4260977).

Swing shift summary (https://logbooks.jlab.org/entry/4261017).

Owl shift summary (https://logbooks.jlab.org/entry/4261281).

We will have an RC meeting today at 11 a.m.

Planned Access to the Hall

Tomorrow (03/06) Hall C will go to Controlled access (we plan to survey the hall around 8am). We plan the following work in the Hall:

  • Heidi and Ellen -- HMS dipole work.
  • Josh -- temperature sensor troubleshooting.

Accelerator

Tomorrow (03/06) during the Day shift the accelerator plans to do some maintenance work first (valve repair, for about 2 hours) and then to do beam studies (for about half a shift), meaning that there will probably be no beam for about a shift or so.

Current Run Plan

Current Issues

  • Hanjie was concerned that some NPS crates have relatively higher fan temperatures (~95F). We put box fans for those crates. We also asked Facilities if they can lower the AC set point from 68F to 65F (was done on Wed 02/28). Hanjie says that the the crates are warm, but stable.
  • For the past week we had a few weird encounters of sudden drops in target heater power that recover by themselves (the latest was overnight https://logbooks.jlab.org/entry/4261277 and the following logentry is from Saturday 03/01 https://logbooks.jlab.org/entry/4259365).
  • NPS temperature sensor issue (Josh Crafts).

Future plans

  • Tuesday (03/05): Moller measurement from 8:30am to around 2-3pm (Dave Gaskell).
  • Wednesday (03/06): Accelerator beam studies + Hall B Moller measurement (?).
  • Sunday (03/10): move the NPS to 8.5m + SHMS/HMS rotation to elastic kinematics. The work is proposed to happen at noon (Steve, Larry, and Jerry).
  • We will stay in KinC_x36_4 until the pass change on March 11th.
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