[Sbs] [Revised Logentry] RC Daily Summary - 10/04/23

[ojevons at jlab.org]

Logentry Text:
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I thought I'd have a smooth end to my stint... boy, was I wrong.

On better news, DAY shift kept running 45uA on the cell with no issues, and we went into SWING running fine. At 5pm, after the RC daily meeting, Ellen went down into the hall and unplugged all of the target RTDs, except the one which is used to control the oven temperature. An hour and a half later, beam was restored, and SWING shift kept the runs coming until just before handover. The DAQ crashed at 11:30pm, but we weren't able to revive it until 20 past midnight, at which point I left the CH. 

The first couple of OWL 50k replays took a lot longer than normal due to error messages that seemed to be due to the SBS GEMs (https://logbooks.jlab.org/entry/4192111), so we didn't notice until 2am-ish that the runs had very low statistics and seemed to display some sort of raster issue (since found out to have been misinterpreting of the plots). Unfortunately, when it rains, it pours: the accelerator went down due to a BLM trip at 2:15am; when the TO tried to move to No Target, it transpired that we had lost IOCHA26, and it needed to be rebooted. The TO worked through this with Bill, and we were back up and ready for beam by 4:20am. MCC weren't able to deliver consistent beam until 5:30am, but the rest of the shift went smoothly at 45uA.

DAY shift today, for the most part, has been running happily at 45uA, minus a 20 minute period where we were having trouble resetting the SBS GEM HV. An issue was spotted with the oven temperature and airflow plots flatlining; IOCHA26 has again been rebooted, which has fixed the issue. We are now back up and running at 45uA (or at least, will be when MCC delivers beam).

We have collected:
- 0.786C (DAY Tuesday, total)
- 0.416C (SWING Tuesday)
- 0.364C (OWL Wednesday)
- 0.436C (DAY Wednesday, up until 12:30pm)

The latest target polarization measurement is at 38.6% (https://logbooks.jlab.org/entry/4192364)



We will have the regular RC meeting at 3:30pm in the Counting House conference room to discuss the run plan going forwards. Alternately, people can join remotely via:

https://jlab-org.zoomgov.com/j/1616220064
Meeting ID: 161 622 0064
Passcode: 314159

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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/4192483
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