Difference between revisions of "RC Update and Run Plan for Aug 20, 2020"

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(Recent polarization measurements)
(General updates)
 
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=General updates=
 
=General updates=
* Todd's Access, He3 refill
+
* Todd's Access, He3 refill at 6:45pm
* Reference cell run  
+
* Reference cell run: 6 hours
 
* Magnet polarity change
 
* Magnet polarity change
* Moller
+
* Positron run (SHMS at 11 degree, P=+7.5 GeV): 1.5 hours
 +
* Moller is still going
  
 
==Pending problem(s) / Things to track==
 
==Pending problem(s) / Things to track==
Line 26: Line 27:
 
<ul>   
 
<ul>   
  
*Make sure [http://opsweb.acc.jlab.org/internal/ops/ops_webpage/restrictions/ops_restrictions.html operational restrictions] are followed.
+
* Make sure the raster size is correct (4--4.5mm)
  
*Make sure the raster size is correct (4--4.5mm)
+
* Monitor beam parameters/configuration very often and post an entry like [https://logbooks.jlab.org/entry/3777457 this] at the beginning of your shift and when run conditions have changed
  
*Monitor beam parameters/configuration very often and post an entry like [https://logbooks.jlab.org/entry/3777457 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
  
*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
  
*Always take 120Hz of EDTM
+
* Fill the BTA with realistic numbers. If the desired beam current is not delivered prorate your ABUs!
 
+
*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. If Hall A hasn't changed in 8 hours, call the RC
 
* Change the IHWP at least every 8 hours when running on glass cells. If Hall A hasn't changed in 8 hours, call the RC
Line 45: Line 44:
  
 
<ul>
 
<ul>
* Continue taking production data on the polarized Helium-3 target in Longitudinal (180 degrees). If not able to reach requested current, pro-rate the ABUs
+
* Complete the Moller measurement (still 4-6 hours of work remain), while keeping an eye on the target polarization.
 
+
  
 
</ul>
 
</ul>
 
== When there is a Down ==
 
* If Hall will have opening for 1+ hours, let Simona know as there is work to do on the SOLID cerenkov.
 
** Let Simona know when the details of the Friday access are worked out with RADCON.
 
  
 
= Notices in Effect for Shift Crew =
 
= Notices in Effect for Shift Crew =
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* Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
 
* 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 [https://logbooks.jlab.org/entry/3747393 entering] and [https://logbooks.jlab.org/entry/3747544 leaving] laser access.
 
** Good examples for [https://logbooks.jlab.org/entry/3747393 entering] and [https://logbooks.jlab.org/entry/3747544 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[https://logbooks.jlab.org/entry/3753633]
 +
* An new reference Cell refill procedure: [https://hallcweb.jlab.org/wiki/index.php/Polarized_Helium-3_Experiments#Pol_He-3_Target_Information New procedure]
 
* Magnet [https://hallcweb.jlab.org/wiki/index.php/How_to_operate_and_monitor_the_Spectrometer_Magnets policies]
 
* Magnet [https://hallcweb.jlab.org/wiki/index.php/How_to_operate_and_monitor_the_Spectrometer_Magnets policies]
 
** Spectrometer GUI (<code>go_magnets</code>) should always be visible on Shift Leader computer, hcdesk3
 
** Spectrometer GUI (<code>go_magnets</code>) should always be visible on Shift Leader computer, hcdesk3
 +
** Slow ramping procedure of the SHMS, go small steps to the MOL, [https://logbooks.jlab.org/entry/3831559 an great example] (1 hour 30 min process)
 
** HMS Q1 must be ramped down in 50A steps in all cases
 
** 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.
 
** 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.
 
** 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.
+
* [https://logbooks.jlab.org/entry/3831644 New SHMS matrix element]
* 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[https://logbooks.jlab.org/entry/3753633]
+
 
+
  
 
= Planned Accelerator Configuration Changes =
 
= Planned Accelerator Configuration Changes =

Latest revision as of 15:14, 20 August 2020

Back to the precious page

RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

General updates

  • Todd's Access, He3 refill at 6:45pm
  • Reference cell run: 6 hours
  • Magnet polarity change
  • Positron run (SHMS at 11 degree, P=+7.5 GeV): 1.5 hours
  • Moller is still going

Pending problem(s) / Things to track

Recent polarization measurements

  • OWL (08/20) 2:30 - 29%
  • OWL (08/20) 12:20 - 10%
  • OWL (08/20) 14:51 - 19.5%

Current Run Plan

Normal Production running

  • Prerequisites
    • 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. If Hall A hasn't changed in 8 hours, call the RC
  • Run plan
    • Complete the Moller measurement (still 4-6 hours of work remain), while keeping an eye on the target polarization.

Notices in Effect for Shift Crew

  • Follow all COVID rules and regulations as well as remind each other.
  • Beam positions: [1]
  • Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled 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[2]
  • 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.
    • 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.
  • New SHMS matrix element

Planned Accelerator Configuration Changes

  • Hall C to 1st pass on 8/31 and back to 5th pass on 9/03


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