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CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 08-06-26
Time : 07:25:25
Day : Thursday
Shift : Day
Crew Chief : Richardson
Program Deputy: Latosky
Team : X
Arm : Humphry
Designated SSO: Janak
LERF Operator:
Operators : Humphry, Janak
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
The OPS DRVHs for the following cavities have been updated: 1L03-2
The OPS DRVHs for the following cavities have been updated:
1L03-2
Username: benesch
Date/Time: 08-06-26_07:25:30
RF Status: Good
Tuner Status: Good
Comment: DRVH=7.400 Arc Rate Management four at 7.6, 3-4 h spacing
Previous OPS DRVH: 7.6
Special Instructions:
The OPS DRVHs for the following cavities have been updated: 1L03-1
The OPS DRVHs for the following cavities have been updated:
1L03-1
Username: benesch
Date/Time: 08-06-26_07:24:34
RF Status: Good
Tuner Status: Good
Comment: DRVH=6.800 Arc Rate Management four at 6.88, irregular spacing, and one at 6.1
Previous OPS DRVH: 0
Special Instructions:
Downtime Incident CLOSED: 2L14-3 OLT
Downtime Incident CREATED: 2L14-3 OLT
Crew Chief Shift Log, 2026-08-06 OWL
Start of shift: Beam to B, C, D.
Crew Chief Timesheet Summary: 06 Aug 2026 OWL
Tuned 2L14-3
The OPS DRVHs for the following cavities have been updated: 2L13-6
The OPS DRVHs for the following cavities have been updated:
2L13-6
Username: victorc
Date/Time: 08-06-26_07:04:33
RF Status: Good
Tuner Status: Good
Comment: DRVH=3.600 Instability (maybe CWWT?) above 3.6 MV/m at ~360 uA linac current
Previous OPS DRVH: 3.8
Special Instructions:
Downtime Incident CLOSED: Hall C config change
Derated 2L13-6 0.2 MV/m
LERF Operator Shift Log, 2026-08-05 SWING
Start of shift: Completing Gradient checks for Cavity 8
MBC8A01H communication error alarms
Every now and then we get short bursts of disruptive comm error alarms in the MCC for this magnet. There was a trim card swap on 07/07/26 to successfully quell mismatches (which also happened to quiet the comm errors that were happening at the time). I think the card could use a reseat, swap, or investigation at the next opportunity.
10 Amp, rack W102B12, channel 15.










