[Halla_running] [New Logentry] RC daily summary Oct 15 2023

[efuchey at jlab.org]

Logentry Text:
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Brief update for today:
We kept taking data over the past day, only impaired by the following incidents:

Hall A beam dump helium dewpoint alarm  https://logbooks.jlab.org/entry/4199725
MCC checked with Radcon that they could still send beam in Hall A  https://logbooks.jlab.org/entry/4199752 
=> 45 minutes down time.
Note on this one: while this issue affects equipment that is located inside Hall A, is under the responsibility of MCC. 
They have made the following comment:
"Troubleshooting this condition could be very time consuming. I recommend the following:
Make the following configuration changes. Step 1 requires access to the Hall, so a convenient time needs to be found.
1. Disable the solenoid valve (remove the low voltage power to the valve). It will fail open.
2. Adjust the low pressure regulator to create a positive flow in the system. Somewhere between 500 and 1000 cc/m should be sufficient."

There will be beam studies on Wednesday, so it could be a good opportunity to do that, depending on how much time MCC needs. It will also be a good opportunity for the GEM experts to investigate the GEM issues.

Other accelerator issue: a valve affecting the 5th pass beam delivery was stuck half-open:  https://logbooks.jlab.org/entry/4199769 
=> 5 hours down time, till ~4am.

So far, we have accumulated 3.081 C (polarization corrected) on target cell Christine.



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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/4200089
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