RC Update and Run plan for Sep 8,2020

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RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

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Accelerator Status

• Sep 07/08 Swing/Owl (yesterday/today):
  • 2L18-4 Preventig filaments (16:34 - 17:06) [1].
  • RSEP9A tripped off (22:21 - ~02:50) [2].
  • Injector cavity 0L04-04 not making gradient (5:05 - 5:56) [3], [4].
  • Injector OR region steering problem (6:21 - 7:42) [5].
  • NOTE: Not the best Owl shift the accelerator has had in terms of beam delivery (~50 min only of beam). See Swing/Owl Beam Current Summary: [6], [7]

• Sep 08 Day (today):
  • Accelerator working on trying to restore beam. As of 08:55, pathlength checked for Hall C beam and looks good [8].
  • Beam restored to Hall C at ~ 09:00.

General Updates

• NOTE: Mingyu Chen has updated the pNMR measurement procedure in the TO training slides. This is in response the the failure of the pNMR fitting program over the past few shifts. It was requested that this be brought up in the next RC meeting (today, Sep 08) [9]
• Sep 07/08 Swing/Owl (yesterday/today):
  • During Sep 07 Swing, d2n production continued at IHWP = IN configuration. We still needed ~50 min. of "beam-on-target" before the next IHWP change, which we were able to obtain during Owl.
  • What are "acceptable" beam profile check (Harp scans) parameters? How much can we compromise with? Will bring up at RC meeting today [10].

• Sep 08 Day (today):
  • MCC 7:45 meeting NOTE: PD (Jay) informed that Ops will need to sent beam to C as part of beam studies (Sep 08 Swing, 16:30 - 19:30). We will need to be in no "No Target" position during beam studies.
  • As of 09:05, Hall C is receiving tune beam. Beam profile checks --> [11], [12]
  • Pol He3 scraping checks --> [13]
  • Start d2n production for ~480 min at the IHWP = OUT configuration.

Run Plan

• See d2n run plan durring beam studies: [14]

d2n Lists of Tasks (target work) During Downtimes

• Upcoming Downtime: Accelerator Beam Studies Sep 08 (Swing) 16:30 - 19:30 (~ 3 hrs) beam expected to be restored at 20:00
  • Target temperature tests
    • Junhao Chen is currently carrying out target temperature tests (expected to finish ~16:30). See the d2n run plan during beam studies: [15]

Opportunistic Hall Access Requests

• Simona Malace:
  • Simona will combine all her controlled accesses into a single controlled access at the end of d2n run period (Sep 17)
  • Alternatively, she would be also be available starting from Friday (Sep 11, Day Shift), to change the gas in the Cherenkov Tank during an opportunistic controlled access to the Hall during unexpected down times. NOTE: She may not need tech support, if she can use the ladder to reach fill the tank. Need ~ 1 hr without tech support. With tech support, may be 1-2 hrs. This can only be done during the day shift.)

Recent NMR Polarization Measurements

• Sep 07/08 (Swing/Owl):
  • NMR @ 17:45 | 39.1 % [16]
  • NMR @ 22:50 | 39.3 % [17]
  • NMR @ 04:53 | 41 % [18]
  • pNMR @ 04:53 | 35.6 % [19]

• Sep 08 (Day):
  • NMR @ 09:24 | 40.7 % [20]
  • pNMR @ 09:24 | 39.6 % [21]

Recent IHWP Changes

• Sep 03 (Swing, as of 19:58) | IHWP = IN
• Sep 04 (Owl, as of 04:00) | IHWP = OUT [22]
• Sep 04 (Day, as of 12:01) | IHWP = IN [23]
• Sep 05 (Day, as of 14:55) | IHWP = OUT [24]
• Sep 06 (Owl, as of 07:00) | IHWP = IN [25]
• Sep 06 (Swing, as of 22:04) | IHWP = OUT [26]
• Sep 07 (Day, as of 12:11) | IHWP = IN [27]
• Sep 08 (Owl, as of 05:05) | IHWP = OUT [28]

General Reminders for Running

• New beam positions have been verified and established to be (0,0) mm for all glass cells. Only need to check beam is at (0,0) and verify no scraping on the glass cells.

• Make sure the raster size is correct (4--4.5mm)

• Monitor beam parameters/configuration very often and post an entry like this at the beginning of your shift and when run conditions have changed

• Running on cell targets: raster always ON (4--4.5mm, size will be determined by the scraping checks), orbit locks ON, current ramp rate 1 muA/sec

• Always take 120Hz of EDTM

• Fill the BTA with realistic numbers. If the desired beam current is not delivered prorate your ABUs!

• Change the IHWP at least every 8 hours when running on glass cells. Call Hall A in advance to request. If there are any issues, call the RC

• Note that the autoload of IHWP status in the Start-Run GUI doesn't work anymore so please double check IHWP setting before you accept the GUI value.

Notices in Effect for Shift Crew

• Follow all COVID rules and regulations as well as remind each other. Additional food guild lines:
  • All food are removed from the round table. Fruit are now store in the fridge, and individually packaged snacks are store on the shelf below the coffee machine.
  • No food near the SL and TO control station. If you would like to eat something, please use the empty round table (used to store food in the past), that is now empty and sanitized.
  • New coffee guide line: it is much preferred if you can bring you mug for the coffee. During the shift if one need to drink coffee near the control station, then the coffee mug must have a lid or have some kind of cover.
• Beam positions: [29]
• 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.
• Inform the RC of any access that the Target Team requires. The RC will coordinate with RadCon to make everything run smoothly.
• 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[30]
• An new reference Cell refill procedure: New procedure
• Magnet policies
  • Spectrometer GUI (go_magnets) should always be visible on Shift Leader computer, hcdesk3
  • Slow ramping procedure of the SHMS, go small steps to the MOL, an great example (1 hour 30 min process)
  • 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.
  • New updates to the magnet momentum ramping procedure: https://hallcweb.jlab.org/wiki/index.php/How_to_operate_and_monitor_the_Spectrometer_Magnets
  • If any of the Spectrometers magnets trip, take a screenshot of the PSU window and check the hall for smoke or water with the camera before resetting the interlock and post it to hclog
• When rotating the spectrometer, use HCCAM01 to keep an eye on the SOLID Cherenkov test stand when rotating SHMS (in addition to watching the live angle-cam image, etc). The updated rotation instruction can be found: https://hallcweb.jlab.org/wiki/index.php/Spectrometer_Rotation#NOTICES_IN_EFFECT
• New SHMS matrix element

Planned Accelerator Configuration Changes

• Hall C to 1 pass on September 17/18, Thursday/Friday