RC Meeting, Saturday, October 02 , 2021

RC Meeting Information

RC Daily Meetings are at 10 am, remote

• 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:
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   +1.888.240.2560 (US Toll Free))
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 2)  Enter Conference ID : 861439920

Useful Links

• Fall 2021 Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Accelerator Status

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Hall C Status

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Current Run Plan

1. Oct 01 Day/Swing --> Oct 02 Owl/Day/Swing:
   • Contine data-taking at current PION-LT kinematic setting ( low eps, Q2=6 GeV2, W=3.19, x=0.39 )
     • Data collected as of 08:00 today: ??% of the total PAC approved beam charge accumulated. We --??--- 85 % of beam charge before lowering the beam current to ~45 uA for the remainder of this kinematic until Sunday Morning.
     • From Jacob's estimates during Oct 01 Owl shift, we accumulated ~ 5 % / shift @ 60 uA of very stable beam. This would mean that we would reach ~85 % of beam charge by Saturday Oct 02 mid-Owl shift assuming beam keeps steady. ( PENDING )
     • After 85% of beam charge has been accumulated ( this is contingent upon beam stability throughout weekend ), request to lower beam current to 45 uA to take the remaining data until Sunday Morning --> https://logbooks.jlab.org/entry/3914672 ( PENDING )
2. SHMS Rotation to 5.5 deg has been scheduled to Hall C for Sunday Morning at 9:00 am ( CLEARED )
   • Will contact Walter Kellner after RC meeting today to determine availability of techs on weekend to co-ordinate entrance to Hall. Will also need to contact Radcon today to give a specific time range at which rotation will take place on Sunday Morning. ( PENDING )
     • Rotation will require 2 beamline spotters (1 on top of HMS platform and one on the floor in-between HMS/SHMS)
     • Garth will volunteer to be a beamline spotter in case in case one of the techs cannot come in on a weekend, but an expert spotter (tech) is still required at the pivot
     • If possible, do rotation in "Controlled Access" (spotter in pivot will have to use ALARA to minimize time near radiation area), otherwise, will go into "Restricted Access" (takes a bit longer)

Current Issues

1. Target ladder camera was identified to be bad: Joe Beaufait will purchase a replacement in the next funding cycle ( PENDING )
   • Still need to follow-up with Joe about when the purchase can be done.

Special Requests

1. Contact Ellen Becker if there is an opportunity to access the hall (longer than 4 hours). This is for diagnosing the SHMS power supply.