RC Meeting and Run Plan, Wed, January 22nd 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

Target training on Thursday 1/23

• Thursday from 2:30PM to 4:00PM in counting house.
• Please send an email to JP (jpchen@jlab.org) or Arun (arunts@jlab.org) to register.

Tuesday day – Wednesday owl

1. Laser alignment and wavelength adjustment
2. New correction coil settings [1]
   • AFP loss per pass: 1.6% in pumping chamber, 0.2% in target chamber [2]
3. NMR field sweep program's transverse pumping chamber signal works [3]
4. pNMR work continues [4]

Wednesday day

1. Multiple accelerator problems overnight and today; some beam this morning
2. Harp scan around noon
   • IHA3H07A IHA3H07B YAG
   • x width at target ~550 um [5]; want <~350 um
   • This morning, MCC asked Simona if we can change beam position for tuning; acceptable procedure?
   • Changed positions back to nominal @12:45PM [6]
3. Moller & spin dance postponed

Last few polarization measurements

spin up curve

  4% @  3AM Wed
 21% @  7AM Wed
 25% @  9AM Wed
 29% @ 12PM Wed 
 32% @  3PM Wed

Current Run Plan

• Take NMR every 5–6 hours
• Always take 120Hz of EDTM

Once beam is back

1. Tune beam; want width < ~350 um, comparable to this entry
   • Can use wire 3 and harp positions to project beam to target.
   • Bill is the beam checkout guru for swing/owl
   • Short beam checkout procedure is here
2. Check beam positions [7]
3. If during day: Moller & spin dance (pending Hall A status)
4. Do NMR measurement
5. Take data:

   if (3He polarization > 38%):

   polarized 3He production data; transverse data; 90degrees

   else:

   3He reference cell data

Wednesday swing – Thursday owl

1. See above beam comments
2. Track polarization to see if changing laser power helped
   • Take 2 more NMR measurements at 6PM and 9PM
   • After these 2 measurements, change polarization angle for transverse production data

Thursday day

• DOE tour in the morning
  • 8:00 AM RadCon sweep
  • 9:30 AM restricted access
  • 10:30 AM tour, over by lunch presumably
• Afternoon
  • See above beam comments

Future

• Arun tentatively getting replacement cell prepared early next week; install it in two(?) weeks?

Special Requests

• Keep target expert schedule filled out on whiteboard

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[8]
• Temporary Laser instructions can be found here [9]