[clas_members] [Revised Logentry] Hall B RC Summary 08/26/2025 (in progress)

[efuchey at jlab.org]

Logentry Text:
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Pass change had started earlier than expected due to Pass 3 separator trip, and took 2 hours total.

Initiated full beam recovery procedure at 9:45 after pass change done
Torus polarity change completed by 11:00.

Harps scans from beam recovery procedure:
To Tagger
2C21A: https://logbooks.jlab.org/entry/4450469
2C24A: https://logbooks.jlab.org/entry/4450484
To Faraday Cup
2C24A: https://logbooks.jlab.org/entry/4450522
2H01: https://logbooks.jlab.org/entry/4450514

DAQ issue at 12:30 (~15 min down - but we were officially "off" anyway)
Production resumed on 4He at 50nA at 13:30:

Target change 4He -> D2 at 22:15, during accelerator down (we only needed 10 extra min of BANU);
Due to miscommunications (for which I share responsibility...), we took 1h data taking with AHDC OFF

Note: Yesterday was floated an idea to request pass change today at 4pm if things go incredibly well, but as if this morning, it has been determined not to be realistic *regardless of past incidient*.
Current plan includes 2*8 ABU at 50 nA, 2*4 ABU at 100 nA, and 2 target changes at 2 hours a pop: that's 28 hours which at 100% efficiency (which we won't have althought we're not far off) and starting at 12pm yesterday (we started at 1:30pm...) would bring us to 4pm today. Not to mention Pass 3 separator was scheduled to be fixed on Wednesday.

Accelerator issues:
* Accelerator officially "OFF" until 14:00: All beam recovery was made on "free beam" 
* After "Elf on the Shelf", "Rack in the Arc (dropped)": https://ace.jlab.org/dtm/incidents/16238 (16 min down)
* 2L05 HV drop (2h down) https://ace.jlab.org/dtm/incidents/16255
=> Target change to D2 at the same time

News from MCC:
* Beam will go away tomorrow at 5:30 for maintenance day and M&O tour. 
* Hall B won't be part of M&O tour, but we have requested to go in restricted for the uRwell prototype installation.

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/4450389
SWING: https://logbooks.jlab.org/entry/4450660
OWL: https://logbooks.jlab.org/entry/4450860

BTA from 8/24 8am to 8/25 8am:
ABU: 911 
BANU: 71
BNA+OFF: 458
Logs:
DAY: https://logbooks.jlab.org/entry/4450655
SWING: https://logbooks.jlab.org/entry/4450844
OWL: https://logbooks.jlab.org/entry/4451053

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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/4450458
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