[Hallc_running] [Revised Logentry] RC summary Oct 20, 2022

[shujie at jlab.org]

Logentry Text:
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(We need more shift workers for this weekend and next week!)

Day starts with smoothly data taking. Beam was trippy now and then. 
HMS Q3 and dipole tripped after Hall B solenoid trip around 14:40. Took about one hour to recover. https://logbooks.jlab.org/entry/4064249. MCC was performing LEM/injector restoration at that time so not much real beam time lost. 
During Swing and Owl shift we got beam authorization to run 70uA (thanks Doug for coordinating!) for BCM calibration. Around 7pm we completed data taking at setting 1 (finally) and started BCM calibration. Finished around 8pm and continue data taking with super stable beam. Beam quality during Owl shift dropped as other halls came online. MCC adjusted our current ramp up rate to 1uA/sec. https://logbooks.jlab.org/entry/4064903. RF group will meet to discuss the beam stability issue.
Now we have 45uA stable beam with Titanium target, about 1/3 of the way into our setting 2. No planned configuration change or hall access.


Notes:

BCM calibration: https://logbooks.jlab.org/entry/4064522
and we observed a correlation b/w energy drift and beam current (Hall A was off) https://logbooks.jlab.org/entry/4064491

Brad switched the gas shed heat pump to "warm" https://logbooks.jlab.org/entry/4064368
 
Two alarms are added to monitor SHMS Q2 vacuum while the vacuum gauge will be installed in the next maintenance day (thanks to Steve and Casey).  https://logbooks.jlab.org/entry/4064546 https://logbooks.jlab.org/entry/4064936 

SHMS HB vacuum  https://logbooks.jlab.org/entry/4064884 and SHMS dipole LN2 level  https://logbooks.jlab.org/entry/4064490. https://logbooks.jlab.org/entry/4064528 are red on magnet GUI. Those are know issues and monitored by Heidi. The latter could be addressed during next hall access.

SHMS aerogel HV off and 50ohm termination was removed from the interlock https://logbooks.jlab.org/entry/4064052

UNSER temperature has been mostly stable with the new controller but occasionally fluctuated https://logbooks.jlab.org/entry/4064634

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We will have our daily RC meeting at 11am. https://hallcweb.jlab.org/wiki/index.php/October_21,_2022
Room 200C (2nd floor of counting house) is reserved. zoom connection:

Join ZoomGov Meeting
https://jlab-org.zoomgov.com/j/1607100885?pwd=ZFBsRTFsYm5Zb0laZ0tyZXNjcE...

Meeting ID: 160 710 0885
Passcode: 595071

Bests,
Shujie Li

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4065001
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