Latest revision as of 18:27, 21 January 2020

RC Meeting Information

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

• Bluejeans remote connection information:

 To join the Meeting:
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 To join via Room System:
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 Meeting ID : 861439920
 To join via phone :
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 2)  Enter Conference ID : 861439920

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
• Start out with target angle at 90 deg. 24 hours of data. 12 hours for each 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.

• When beam returns, contact RC. Do short beam checkout (checkout beam on the YAG and

harp scans). Check that orbits locks on and beam positions are at nominal. Do not need to do carbon hole.

• 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