Difference between revisions of "RC Meeting and Run Plan, Wed, January 22nd 2020"
From HallCWiki
(→Wednesday day) |
(→Once beam is back) |
||
| (13 intermediate revisions by the same user not shown) | |||
| Line 46: | Line 46: | ||
==== Last few polarization measurements ==== | ==== Last few polarization measurements ==== | ||
| + | [https://logbooks.jlab.org/entry/3768563 spin up curve] | ||
4% @ 3AM Wed | 4% @ 3AM Wed | ||
21% @ 7AM Wed | 21% @ 7AM Wed | ||
| Line 57: | Line 58: | ||
==== Once beam is back ==== | ==== Once beam is back ==== | ||
| − | # Tune beam; want width < ~350 um | + | # Tune beam; want width < ~350 um, comparable to [https://logbooks.jlab.org/entry/3764451 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: | ||
| + | #**https://hallcweb.jlab.org/wiki/index.php/Beam_and_Raster_Checkout_for_A1n/d2n_(Short_Procedure) | ||
# Check beam positions [https://logbooks.jlab.org/entry/3768504] | # Check beam positions [https://logbooks.jlab.org/entry/3768504] | ||
# If during day: Moller & spin dance (pending Hall A status) | # If during day: Moller & spin dance (pending Hall A status) | ||
| + | # Do NMR measurement | ||
# Take data: | # Take data: | ||
| − | #: if (3He polarization > | + | #: if (3He polarization > 38%): |
#:: [https://hallcweb.jlab.org/wiki/index.php/5-pass_production_for_A1n#Large_Angle_.2830-degree.29_Polarized_3He_Asymmetries_High_Momentum_Setting_.28Kine_4.2CB.2C_511_PAC_hours.29 polarized 3He production data; transverse data; 90degrees] | #:: [https://hallcweb.jlab.org/wiki/index.php/5-pass_production_for_A1n#Large_Angle_.2830-degree.29_Polarized_3He_Asymmetries_High_Momentum_Setting_.28Kine_4.2CB.2C_511_PAC_hours.29 polarized 3He production data; transverse data; 90degrees] | ||
#: else: | #: else: | ||
| Line 67: | Line 73: | ||
=== Wednesday swing – Thursday owl === | === Wednesday swing – Thursday owl === | ||
| − | + | # See above beam comments | |
| − | * | + | # Track polarization to see if [https://logbooks.jlab.org/entry/3768572 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 === | === Thursday day === | ||
| Line 77: | Line 85: | ||
* Afternoon | * Afternoon | ||
** See above beam comments | ** See above beam comments | ||
| + | |||
| + | === Future === | ||
| + | * Arun tentatively getting replacement cell prepared early next week; install it in two(?) weeks? | ||
= Special Requests = | = Special Requests = | ||
Latest revision as of 19:14, 22 January 2020
Contents
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
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
- Laser alignment and wavelength adjustment
- New correction coil settings [1]
- AFP loss per pass: 1.6% in pumping chamber, 0.2% in target chamber [2]
- NMR field sweep program's transverse pumping chamber signal works [3]
- pNMR work continues [4]
Wednesday day
- Multiple accelerator problems overnight and today; some beam this morning
- Harp scan around noon
- Moller & spin dance postponed
Last few polarization measurements
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
- 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:
- Check beam positions [7]
- If during day: Moller & spin dance (pending Hall A status)
- Do NMR measurement
- Take data:
- if (3He polarization > 38%):
- else:
Wednesday swing – Thursday owl
- See above beam comments
- 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.
- 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]
