[Prex] [New Logentry] RC Update 2/25/2020

[adaq at jlab.org]

Logentry Text:
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Dear Collaborators,<br>
<br>
Apologies for not sending this update before the 3:15 meeting.<br>
<br>
Yesterday the Moller measurement finished by 18:49. Results: HWP in 0.8593 +-0.001587 and HWP out 0.8647 +-0.001584.​ <br>
<br>
We then began to restore to Ca48 running. Amali steered the beam through the Compton and a Harp scan was performed. After a C1% checkout we returned to production on Ca48 at 21:25. The night was very productive and we ran at ~70% efficiency. <br>
<br>
Beam was taken away at 8:30 for injector work. During this time an injector QE scan was done along with PSS work. The PD has indicated that none of this work should impact us once we are back up and running. During this down time we made numerous accesses for the techs to check magnets and vacuums, electron detector work, and Compton work. As of 17:05 we are still down. <br>
<br>
Tomorrow we are planning to go to restricted access in the morning (hoping to sweep the hall at 7:30) ahead of the 9:00-12:00 accelerator down for safety meetings. There will be no accelerator support during this time so unless we are in restricted there will be no hall access. Being in restricted will allow Jack to get some work done on the magnets during the downtime, and allow any other work we would like to do in the hall. Jesse will also be leading some contractors on a site visit around 13:30, and he is asking OPs/RadCon to support a sweep to close up the hall again when this visit ends roughly around 15:00 tomorrow. <br>
<br>
Outstanding Issues:<br>
<br>
1. Downtime and hall work tomorrow (accelerator safety meetings and contractor site visit).<br>
<br>
Resolved Issues:<br>
<br>
1. Moller Measurement completed (logs 3791145 and 3791130).<br>
2. Electron detector appears to be fine (log 3791334).​<br>
3. Target appears to be fine (logs 3790942 and 3791039).<br>
<br>
Best,<br>
<br>
Scott Barcus <br>
(current Hall A Run Coordinator)<br>


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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/3791912
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