Difference between revisions of "RC Update and Run Plan for Aug 10, 2020"

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* Requested 27 uA of beam through the night and made changes as required to improve stability.  
 
* Requested 27 uA of beam through the night and made changes as required to improve stability.  
 
* Beam seemed to improve on day shift.
 
* Beam seemed to improve on day shift.
* Hall D had a down, so we took BCM calibration. Highest current 34 uA.  
+
* Hall D had a down, so we took BCM calibration. Highest current 34 uA. [https://logbooks.jlab.org/entry/3824242]
  
 
== Pending problem ==
 
== Pending problem ==
 +
* HMS changed yesterday only in epics readback from 20.0 to 20.03--weird timing [https://logbooks.jlab.org/entry/3824292]
  
 
== Recent polarization measurements ==
 
== Recent polarization measurements ==
  
* 43.1% at 8:30am [https://logbooks.jlab.org/entry/3824037]
+
* 42.8% at 3:15pm [https://logbooks.jlab.org/entry/3824271]
  
 
= Current Run Plan =
 
= Current Run Plan =
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* Plan for BCM calibration when C has priority. Need two more cycles (disruptive to D due to shared slit).  
 
* Plan for BCM calibration when C has priority. Need two more cycles (disruptive to D due to shared slit).  
 
* After ~ 10 days of running Hall C will go to 1 pass for ~3 days
 
* After ~ 10 days of running Hall C will go to 1 pass for ~3 days
 +
* EPR diode good for now, but check for future planned accesses.
  
 
==== Hall Access ====
 
==== Hall Access ====
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* Plan for Tuesday--Controlled Access:
 
* Plan for Tuesday--Controlled Access:
 
** Beam ends.
 
** Beam ends.
** Target to change spin polarization (270->90). EPR calibration. Junhao to check if EPR photodiode ok.  
+
** Target to change spin polarization (270->90). EPR calibration.  
 
** RADCON sweeps Hall at 8am. Steve L enables rotation and enters with Radcon to rotate HMS from 20 to 29 deg.  
 
** RADCON sweeps Hall at 8am. Steve L enables rotation and enters with Radcon to rotate HMS from 20 to 29 deg.  
 
** Simona, Walter and techs to enter Hall for SoLID cerenkov and HMS Q1 vacuum check. Anticipated 4-5 hours of work.  
 
** Simona, Walter and techs to enter Hall for SoLID cerenkov and HMS Q1 vacuum check. Anticipated 4-5 hours of work.  

Latest revision as of 15:56, 10 August 2020

RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

Monday Aug 10 2020.

General updates

  • Finally got beam at the end of swing. Able to do beam checkout. Very trippy.
  • Requested 27 uA of beam through the night and made changes as required to improve stability.
  • Beam seemed to improve on day shift.
  • Hall D had a down, so we took BCM calibration. Highest current 34 uA. [1]

Pending problem

  • HMS changed yesterday only in epics readback from 20.0 to 20.03--weird timing [2]

Recent polarization measurements

  • 42.8% at 3:15pm [3]

Current Run Plan

Normal Production running

  • Prerequisites
    • Make sure the raster size is correct (4-4.5)
    • 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 (4-4.5, 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 every 4 hours when running on glass cells
  • Run plan
    • Production on 3He; if not able to reach requested current (27 uA), pro-rate the ABUs

Notes for tomorrow's 7:45 meeting

Future

  • Opportunistic target polarization calibration and studies on Tuesday-Wednesday during beam off and Moller measurement (priority is beam)??
  • Moller measurement on Wednesday
  • Plan for BCM calibration when C has priority. Need two more cycles (disruptive to D due to shared slit).
  • After ~ 10 days of running Hall C will go to 1 pass for ~3 days
  • EPR diode good for now, but check for future planned accesses.

Hall Access

  • Plan for Tuesday--Controlled Access:
    • Beam ends.
    • Target to change spin polarization (270->90). EPR calibration.
    • RADCON sweeps Hall at 8am. Steve L enables rotation and enters with Radcon to rotate HMS from 20 to 29 deg.
    • Simona, Walter and techs to enter Hall for SoLID cerenkov and HMS Q1 vacuum check. Anticipated 4-5 hours of work.
    • Steve L. will remotely update the software on HMS dipole to decrease interlock due to false spike in current lead mass flow [4].

When there is a down:

Notices in Effect for Shift Crew

  • Beam positions: [5]
  • 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
    • Spectrometer GUI (go_magnets) should always be visible on Shift Leader computer, hcdesk3
    • 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.
    • 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.
  • 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[6]

Planned Accelerator Configuration Changes

  • 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

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