RC Meeting, Thursday, January 27, 2022

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RC Meeting Information

RC Daily Meetings are at 10 AM, remote

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Accelerator Status

  1. Jan 26 Day / Swing (yesterday):
    1. Accelerator Maintenance: Beam Studies / RF Recovery
    2. Tuned up Hall C line, and briefly sent 70 uA before XSEP8T tripped off (4th-pass separator extractor), which only affects Hall C. Still no beam as of now. XSEP8T Fault

Hall C Status

Current (is what we need, LOL) RC: Carlos Yero

  1. Jan 26 Day / Swing (yesterday):
  2. Jan 27 Owl / Day (today):
    • Beam Restoration to Hall:
      1. Physics beam was briefly restored to Hall C line for a brief period, enough to get a Carbon Hole check done (probably will need to re-do, not enough beam time to check stability of beam position)
      2. Still no physics beam due to above-mentioned accelerator issue.

Current Run Plan

  • Running Q2=5, W=2.95, low epsilon, left
    • SHMS settings: theta = 8.17 degrees, P=6.719 GeV
    • HMS settings: theta = 44.37 degree, P=-1.104 GeV
    • Targets = LH2, aluminum dummy
  • accumulated statistics on LH2: 57 %
  • statistical goal: 10,000 events
  • need to take 3.5 hrs of beam-on-target (i.e., 100 % beam efficiency) on Al dummy.

Current Issues

  • Vertical beam position on target has changed a little: Dave Meekins is not concerned about an offset of this size (<0.5 mm).
  • There is a rotation issue that has come up if moving HMS between 19 to 25 degrees. It usually gets stuck around this range, please be wary of this issue. We will likely skip settings in this range if this drive controller error cannot be solved. For singles it will not be a big deal to skip settings for HMS at those angles. We need a longer access to address this issue.
  • The Raster Coil pair Ax and Ay are off
  • Diffuser limit at 46uA (Note: is this still valid?)
  • The SHMS encoder could drift after the physical rotation is done. If that happens we would need an access to reboot the encode/power cycle the rotation rack: https://logbooks.jlab.org/entry/3974431

Special Requests

  • None

Notices in Effect for Shift Crew

  • The Raster Coil pair Ax and Ay are off. Raster needs to be at 4x4. Raster gui has been updated - can now request 2x2.
  • With LHe alarms it is good to check the cameras for plumes. If no plume and it is below the LO alarm and above LOLO then monitor with a plot and halog the problem.
  • With LNitrogen alarms are not that critical. Just need to start monitoring the problem with plot and Halog.
  • HMS NMR is not locking stably - the alarm is turned off. Please check on the NMR readback (while it is locked) intermittently to make sure the HMS dipole field is not drifting,
  • Please keep an eye on the HMS NMR during shift. Due to the NMR locking instability, the alarm has been been disabled, so slow drifts of the NMR signal may be missed.
  • See note on lower right TV screen for bringing up Zoom in CH for remote 3rd shifts
  • Please use the strip-chart on bottom, left Wall TV to stay informed on trends of the SHMS and HMS transfer line vacuum and the magnets insulating vacuum.

Crew Chiefs, We have permission to raise the Hall C diffuser raster limit to allow running >46uA to Hall C. This limit is normally imposed when one of the two rasters is not operative. Since the hall was able to double the running raster current to get the same size raster on the target as having both rasters, Keith is allowing us to raise the limit. To get to the setting, open the Hall C diffuser interlocks screen. Go to the bottom right corner and open the Expert screen. Just below and to the right of the FSD bits, raise the "Raster 1 OK Limit" to slightly above the highest current the hall wants to run at. Do not change the Raster 2 limit. Make a log entry with screen shots. Make an ABIL entry, System MPS and an expected removal date of 3 Jan. 2022. Paul

Announcements

  • Social distancing requirements back in place. Please maintain a separation of 6 feet during shifts.
  • See updated guidance on JLab COVID-19 isolation and quarantine protocols: https://www.jlab.org/memo/jlab-covid-19-isolation-and-quarantine-requirements
    • Communicate with Occupational Medicine if you have COVID-19 symptoms, have tested positive for COVID-19, or have been exposed to someone who has tested positive for COVID-19: (jnewman@jlab.org or jbanks@jlab.org).
    • In accordance with updated CDC masking guidelines and DOE mandate, cloth masks are no longer permitted or accepted as approved face coverings on-site. Only KF94, KN95, surgical masks and N95s* may be used.
    • N95 masks may be obtained from Industrial Hygiene and worn under voluntary use while on-site as long as social distancing is followed and you have current MED13 (respirator medical approval). To obtain a N95, contact Jennifer Williams from Industrial Hygiene.
    • When your work REQUIRES you to be within 6 feet of others, then a N95 (or better respirator) is required. To use a N95 for close proximity work, a MED13, SAF200 and fit test are also required. Fit tests may be coordinated by reaching out to Jennifer Williams.

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