[Hallc_running] [New Logentry] RC summary Oct 26, 2022

[shujie at jlab.org]

Logentry Text:
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Oct 25-26, 2022

Hall C had very good beam in the last 24 hours though sometimes we got 50uA when asking for 60. Only a small MCC beam down due to an LIU fault.  We are expecting to finish this SHMS angle late today. So an escorted access is planned this afternoon to reboot the SHMS angle camera in order to rotate SHMS remotely.  There will be ~4hr RF recovery tomorrow, hall will be in control access. Please let the new RC know if you need an access.

According to runplan our next task is boiling and rates study which requires stable beam up to 60uA, which seems to be an issue in the past two days. We will discuss if an alternative plan is needed at the RC meeting.

During day shift, shift worker noticed that the energy lock was off and called MCC to bring it back  https://logbooks.jlab.org/entry/4068686
There was once when the target was masked and moving, the system suddenly jumped to "do not move" . According to MCC they somehow lost the "mask" status for a second because of beam trip. It quickly recovered and didn't interrupt the target motion.  https://logbooks.jlab.org/entry/4068685
Dave Mack came and tested UNSER connections in counting house for possible crosstalk /grounding. Everything looks fine but the BCM05 temperature still makes spikes when moving target. More investigation will be done tomorrow during RF recovery.https://logbooks.jlab.org/entry/4068738

CODA crash was monitored overnight as suggested by Bob https://logbooks.jlab.org/entry/4069728
The Owl shift workers noticed the SHMS NGC mix neon fraction  shows 0 in alarm handler but all other quantities are good. Casey and Dave suggested that the readback needs a hard reset. Not urgent, can be done tomorrow during control access.https://logbooks.jlab.org/entry/4069438
 
HMS Dipole NMR frequently loses lock. Very annoying.

We will have 11am RC meeting as usual on second floor of counting house and on ZOOM: 
https://hallcweb.jlab.org/wiki/index.php/October_25,_2022

Zoom link:
Join ZoomGov Meetinghttps://jlab-org.zoomgov.com/j/1607100885?pwd=ZFBsRTFsYm5Zb0laZ0tyZXNjcE...

Meeting ID: 160 710 0885
Passcode: 595071

It has been a smooth week with 64% efficiency thanks to the support from MCC, Hall C techs and engineers, and shift workers.
Narbe Kalantarians will take over after 1:30 MCC meeting. Good luck!

Bests,
Shujie (Hall C RC)


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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/4069829
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