Difference between revisions of "RC Meeting and Run Plan, Tues, January 21st 2020"

From HallCWiki
Jump to: navigation, search
(General updates)
(General updates)
Line 26: Line 26:
 
=General updates=
 
=General updates=
 
*Beam was fairly good over the holiday weekend. After the injector work on Monday owl
 
*Beam was fairly good over the holiday weekend. After the injector work on Monday owl
*Beam turned off to fix IL20 . During downtime, PNMR worked on and laser alignment checks done.
+
*Beam turned off to fix IL20 with beam off for DAY shift.  
 +
**During downtime, PNMR worked on and laser alignment checks done.
 
*Moller measurement on Sat morning. [https://logbooks.jlab.org/entry/3766434 Summary]
 
*Moller measurement on Sat morning. [https://logbooks.jlab.org/entry/3766434 Summary]
 
*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.
 
*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.

Revision as of 14:51, 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:
 https://bluejeans.com/861439920
 To join via Room System:
 Video Conferencing System: bjn.vc -or-199.48.152.152
 Meeting ID : 861439920
 To join via phone :
 1)  Dial:
   +1.408.740.7256 (US (San Jose))
   +1.888.240.2560 (US Toll Free))
   +1.408.317.9253 (US (Primary, San Jose))
   (see all numbers - http://bluejeans.com/numbers)
 2)  Enter Conference ID : 861439920

Useful Links

General updates

  • Beam was fairly good over the holiday weekend. After the injector work on Monday owl
  • Beam turned off to fix IL20 with beam off for DAY shift.
    • During downtime, PNMR worked on and laser alignment checks done.
  • Moller measurement on Sat morning. Summary
  • 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.

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.
  • Trying to determine when the Moller spin dance will happen.
  • 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

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.
  • 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[1]
  • Temporary Laser instructions can be found here [2]


Planned Accelerator Configuration Changes