[Halla_running] [Revised Logentry] RC Daily Summary 05/10/25

[asar at jlab.org]

Logentry Text:
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Yesterday we could finish the beam recovery procedure by 12:20 and then Jiwan requested the escorted access to replace one of the faulty fADC. The replacement was completed around 2:00PM (https://logbooks.jlab.org/entry/4372112).
Hall A went into beam permit and IC calibration for thin carbon foil was done at raster size 2 mm x 2 mm and orbit was locked at H -0.9; V 1.0. 

We started straight through data taking around 4:00PM with thin C, GEM HV ON, SBS OFF, PS13=8, PS13=9 at 1 uA beam current. Later Beam current was raised to 3uA and PS=7. We had to extend run time till 7:00PM due to reduced beam time and few coda crashes.

We finished preparation for physics run around 7:30, but had to weight until 9:00 for beam. MCC had to do IC calibration for LH2. We could get only 1h 20m of beam to make an attempt for the optimization of ECal, HCal thresholds, trigger matching etc. However this 1 hour of beam gave us some signature of improvement/correction to be implement on various sub-systems.

We had long downtime from accelarator side ~8h for next beam. Beam position check was done on cross target and a slight shift towards left was observed along with Y beam position(https://logbooks.jlab.org/entry/4372686). MCC was informed about the issue. This problem was also raised in MCC RC meeting. They were struggling with many issues whole night (unstability in machine, orbit motion oscillation). MCC will do some investigation on this issue while we have next beam. 

There is still work going on accelerator side (ARC A box supply trip, water leakage in tunnel, orbit separation). MCC is expecting they can try sending beam by 1:00PM, If another power trip/fault happens they will stop until Monday.

Shifts summary:

Day: https: https://logbooks.jlab.org/entry/4372673
Owl: https: https://logbooks.jlab.org/entry/4372475
Swing: https: https://logbooks.jlab.org/entry/4372200

Details of RC summary can be found at: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Saturday,_May_10th

To discuss the updates and the upcoming plan, we will have RC meeting at 1:30 pm today on the second floor of Counting house and via zoom: 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/4372762
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