March 3, 2024

Back to the calendar

RC Meeting Information

Current RC: Iuliia Skorodumina

No RC meeting today.

Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board
• Daily RC Reports

Summary

Yesterday (03/02) during Day shift there were 3 hours with no beam due to the issues with Arc 7 Box Supply (https://logbooks.jlab.org/entry/4259708), but apart from that the beam delivery was very stable over the last 24 hours. There wasn't many interruptions on our side, too, so we were just smoothly taking data in KinC_x36_6 kinematics.

We will stay on this kinematic setting for 3 more shifts and on Monday morning we will proceed to the next kinematic setting, which is KinC_x25_4. Yesterday during the RC meeting we discussed background/currents/rates issues and Charles and Peter Bosted came up with the revised plan for NPS setup change on Monday Mar 4 (https://logbooks.jlab.org/entry/4259689). According to the new plan, we will move the calorimeter from 6m to 4 m and will keep the magnet wings on. We will stay on KinC_x25_4 until March 11.

Tomorrow (03/04) the beam will be taken away at 7:30am in the morning and the hall will go to Controlled access for the NPS setup change to be performed.

Day shift summary (https://logbooks.jlab.org/entry/4259614).

Swing shift summary (https://logbooks.jlab.org/entry/4259740).

Owl shift summary (https://logbooks.jlab.org/entry/4259902).

No RC meeting today.

Planned Access to the Hall

• Tomorrow (03/04) the hall will go to Controlled access 7:30am-8:00am for the NPS setup change (https://logbooks.jlab.org/entry/4259689).

• Bob Michaels and Hanjie would like to do some scaler tests with the DAQ during the downtime on Monday (see the comment to https://logbooks.jlab.org/entry/4259689).

• Julie wants to replace two faulty PMTs tomorrow during the access. Swapping those two pmts needs to be done while the calo is at 6 m and should take less than one hour. She also advises changing the FADC module that records block 1075 for a better one.

Accelerator

n/a

Current Run Plan

• Short-term run plan: https://hallcweb.jlab.org/wiki/index.php/Short_Term_Run-Plan
  • KinC_x36_6, NPS at 7.5 deg, calorimeter at 6m

• NPS position for the next kinematics setting:
  • 5m vs 6m (Charles): https://logbooks.jlab.org/entry/4258150
  • Peter Bosted (https://logbooks.jlab.org/entry/4259621).
  • Revised plan from Charles (https://logbooks.jlab.org/entry/4259689).

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).
• On Saturday (03/01) during Swing the heater power for both the loops 1 and 2 dropped to zero and recovered in a few minutes (https://logbooks.jlab.org/entry/4259365).

Future plans

• Monday (03/04): NPS setup change (https://logbooks.jlab.org/entry/4259689).
• Moller measurement next week (probably Tuesday)