Revision as of 16:43, 21 January 2020

RC Meeting Information

RC Daily Meetings are at 4:15 PM, 2nd floor Counting House Meeting Room

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Useful Links

• Main Pol He-3 wiki
• Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

General updates

• Beam was fairly good over the holiday weekend.
  • Moller measurement on Sat morning. Summary
  • After the injector work on Monday owl, the beam was excellent.
• Beam turned off to fix IL20 with beam off for DAY shift.
  • During downtime, PNMR was made to work [1] and laser alignment checks done [2].
  • Andy Kenyon implemented a supplemental nitrogen for the cooling jets. Still using the nitrogen from the cryogenics, but if it drops too low the supplemental will kick in. [3]
• Beam restore may take a while given Hot spots

Current Run Plan

• Take NMR every 5-6 hours
• Always take 120Hz of EDTM
• Hall B will do Moller when beam back. They will do measurement with present IHWP and then flip IHWP.
• Moller spin dance Wed at 8-12.
• DOE tour on Thursday at 11 for 15 minutes. Need to go to restricted access. Radcon to start survey at 10am.

• After beam comes back we have two options:

1.If the target polarization is good

• we will continue with the present kinematics with the polarized target. Run plan for high momentum 30 deg polarized helium

2.If the target polarization needs time to increase

• We will do the cross section study with 3He reference cell
  • See Run Plan
  • This is about 5 hours of 30uA beam
  • Will need to cycle magnets to go back to HMS/SHMS at -3.5/-3.4 GeV/c.
• If the target polarization still needs time to increase
  • we will do part of the reference cell empty,N2 and H2 running for HMS/SHMS at -3.5/-3.4 GeV/c.
  • See RUn plan
  • This is about 6 hours of 30uA beam
• Otherwise more data with the polarized target. Run plan for high momentum 30 deg polarized helium

Special Requests

Notices in Effect for Shift Crew

• Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
  • Good examples for entering and leaving laser access.
• Magnet policies
  • HMS Q1 must be ramped down in 50A steps in all cases
  • Do not ramp HMS Q2 to zero, only go to 10A and then switch off power.
• Inform the RC of any access that the Target Team requires. The RC will coordinate with RadCon to make everything run smoothly.
• The operators have been somewhat careful with our beam orbit locks. Please make sure that the orbit locks are enabled and the beam does not drift from its nominal position.
• Ramp rate lock instructions are here and added to checklist[4]
• Temporary Laser instructions can be found here [5]

Planned Accelerator Configuration Changes