[clas_members] [Revised Logentry] Hall B RC Summary 08/27/2025

[efuchey at jlab.org]

Logentry Text:
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Continuing pass 1 plan, with 50nA on D2 until 10:30
10:40-14:45: 100 uA on D2: 
14:50-20:35: 200nA on D2:
Issues during 200nA data taking 
* Downstream halo counters alarm: https://logbooks.jlab.org/entry/4451237 
-> Eugene fixed it by raising thresholds;
* DAQ issue, then livetime with 200nA and rgl_2GeV_v7.5.trg too low (30%) 
-> Valery fixed it.
* Accelerator scheduled (and unscheduled) downs (see below)

20:40-22:35 Target change from D2 to 4He.  Sync-ed quite well with 2L20-2 issue (see below), only 30min of BANU necessary.

Production on 4He, 100 nA 8/26, 22:50 - 8/27, 2:35
Production on 4He, 200 nA 2:35 - 5:15
Issues during 4He production:
00:15 Trig bit issues, Sergey indicated that adcft3 needed to be rebooted (15 min down): https://logbooks.jlab.org/entry/4451530
5:10 (yes, 5 min before beam is taken away): AHDC HV drop, wouldn't come back with OFF/ON 

Accelerator time-offs/issues:
13:15 scheduled /one hour/ beam down to set Hall D back online at 15:30 (Yours truly had been informed immediately and adjusted the run plan)
(and of course we had purged the target before we knew... to be fair it is due every 12-ish hours on D2)
15:30 schedule beam off for... 2 hours 30 minutes! - (Yours truly should have know better...)
After which issues with 2L07-4 https://ace.jlab.org/dtm/incidents/16279 (15 min down)
https://ace.jlab.org/dtm/incidents/16283
20:35 2L20-2 RFCM watchdog fault (1:50 down) https://ace.jlab.org/dtm/incidents/16281
3:35 1L14 HV drop https://ace.jlab.org/dtm/incidents/16283 (12 min down)
5:15 beam taken away for maintenance

Summary of Pass 1 data so far:
Time/charge for 50nA, 4He:  430 min ABU / 1.29 mC
Time/charge for 50nA, D2: 472 min ABU / 1.42 mC
Time/charge for 100 nA, D2: 211 min ABU / 1.266 mC
Time/charge for 200 nA, D2: 60 min ABU / 0.72 mC
Time/charge for 100 nA, 4He: 195 min ABU / 1.17 mC
Time/charge for 200 nA, 4He: 130 min ABU / 1.56 mC

Plan for tonight is to take calibration data on hydrogen (and not Helium-2 of course...)

News from MCC: 
Long maintenance day today: https://logbooks.jlab.org/entry/4451693
Beam will most likely not be back before late swing.

RC meeting 11:30, in person at CH 200 or on zoom at https://jlab-org.zoomgov.com/j/1605705819

Shift summaries:
DAY: https://logbooks.jlab.org/entry/4451056
SWING: https://logbooks.jlab.org/entry/4451286
OWL: https://logbooks.jlab.org/entry/4451512

BTA from 8/26 8am to 8/27 8am:
ABU: 748
BANU: 121
BNA+OFF: 571 
Logs:
DAY: https://logbooks.jlab.org/entry/4451283
SWING: https://logbooks.jlab.org/entry/
OWL: https://logbooks.jlab.org/entry/

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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/4451103
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