[Rgc] [New Logentry] RC Daily Summary, Oct 27th 2022.

[deurpam at jlab.org]

Logentry Text:
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Summary from Wednesday-owl (10/26/2022) to Thursday-Owl (10/27/2022)

General Summary:
- The day was spent taking production data, 8nA on ND3, FTout/ELMO configuration, with BHWP in until 16:15 (run 17289), then BHWP out (per Hall A request). 
Beam polarization is about -25% (according to NMR. The trigger helicity asymmetry indicates in average a lower polarization). 
There was a short access around noon (20min total) to turn on the shim coils for the target (they are designed to improve the magnetic field homogeneity at the cell location). 
Today's run efficiency was good, with an ABU of 15.8h (7am yesterday to 7am today).

Events accumulated (~7am yesterday to ~7am today):
527M events (run 17287 to 17295)

Plan:
8AM: MCC starts RF-recovery
8:45: ask for Controlled Access for target change (NH3 --> Carbon).
9:00 RadCon should come to survey the target area. The target group will go in for about 2h to do:
*NMR study to try to understand the discrepancy between target polarization estimates from NMR vs trigger helicity asymmetry.
*NH3 --> Carbon target change.
*Turning off shim coil and lower the solenoid current by 1A.
~Noon: expected end of RF-recovery. When the beam is back and acceptable, do a Moller run.
Then production on carbon until Saturday

- 

We will have our regular RC meeting today at 2.00pm

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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/4070814
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