[Hallc_running] [New Logentry] Hall C RC Update

[chandan at jlab.org]

Logentry Text:
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Yesterday was the MCC maintenance day. We used that time to work on the NPS Calorimeter (https://logbooks.jlab.org/entry/4183694) on the smaller Moller quad (https://logbooks.jlab.org/entry/4183571) and Heidi worked on the soft vacuum for the main cryo distribution box. We requested to take the hall into beam permit around 16:30. But, due to PSS fault, the hall dropped to restricted access. 

We got the beam back around 20:45, but we could not start data taking as there was a cryo-target temperature alarm - this was related to the adjustment the cryo group made to compensate for the soft-vacuum problem in the main distribution box in the hall. We started data-taking shortly after midnight. Around 2:30, MCC noticed the smaller Moller quad waterflow failed. After they fixed that remotely, they couldn't turn on the power supply. So, they took quick controlled access. The power supply refused to turn on either remotely or locally. Around 4:40 a.m., the crew chief decided to defer to normal work hours for this troubleshooting.

We have requested for full-hall survey and we are planning to stay in the controlled access. The DC power needs four keys and Hall C Techs needs 4 keys (to address the soft vacuum problem of the main cryo distribution).

We will defer the MOLLER measurement for today if we are back to beam late in the afternoon.
Dave Mack said he will try to replace some of the HV channels (those are giving warnings sometimes) today while we are down.
The NPS calorimeter team notified us that there is an NPS channel that is not working - they want to address that. The DC power and Hall C Techs have the highest priority for the access today.

Shifts:
We need a TO for this Saturday's swing shift and there are a couple of open shifts for the next week. 
Please consider signing up for the open slots (https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRunId=DVCS-NPS-2023).

There will be the usual RC meeting today at 11 a.m. Zoom information is below:
https://jlab-org.zoomgov.com/j/1617015555?pwd=L09IQ216dml6ZmM5ODExVjFsMX...
Meeting ID: 161 701 5555
 Passcode: 288953

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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/4184378
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