Aggregator

Log Number: 4473469Logbook(s): 

• POLOG
• ELOG

Entry Makers: gramesBody: 

Victor, Amy and Dennis have been struggling to get the beam to behave as expected in the 0L region. So today Victor and I took a little walk to stare at the 0L region and adjacent magnets. We're not really sure if any of this will solve the mystery, but we did find a few things worth following up by Ops and next MD...

1. Victor noticed there is magnetic field from a 5D corrector ~leaking out nearest to the 0L beamline. Looking at the 5D magnets we found that many were on, see Fig. 1. I expected all to have 0 B-dl's.

Log Number: 4473468Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Injector
User: yoon

Log Number: 4473467Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: RF was turned on in:
R02
R03
R04

Log Number: 4473464Logbook(s): 

• ELOG

Body: 

Lots of troubleshooting drive-line problems and 2.5 W amplifiers in SL14,16,19 and KMAI and Filament problems in several zones both Linacs. Logged all in cavity history but restored them to what they would do so the whole zone could be left in RF.

Log Number: 4473463Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L13-2
Username: kerns
Date/Time: 02-27-26_16:51:20
RF Status: Good
Tuner Status: Good
Comment: DRVH=6.000 Vacuum trips above 6.0 Mv/m.
Previous OPS DRVH: 9
Special Instructions:

Log Number: 4473461Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
1L13-2
Username: kerns
Date/Time: 02-27-26_16:39:06
RF Status: Good
Tuner Status: Good
Comment: Recovered to 6 Mv/m. Anything above might be upsetting vacuum.
Special Instructions:

Maintenance Tag: Component: Other

Log Number: 4473460Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             02/27/2026
SHIFT:               Swing

The operator has read the following:

• ELOG
• PD Shift Plan
• Radiation Surveys for PSS Segments in Controlled Access
• PSS Log

Log Number: 4473459Logbook(s): 

• ELOG

Body: ACC has been disabled in alarm handler

no beam in the machine

Log Number: 4473458Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
1L21-7
Username: kerns
Date/Time: 02-27-26_16:12:32
RF Status: Bad
Tuner Status: Good
Comment: RATN 0 GLOD -2.0v and GASK railing. Needs 2.5 W amp and driveline cables checked.
Special Instructions:

Maintenance Tag: Component: 2.5W Amp

Log Number: 4473457Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Took RATN to 0.0 db and GLOD had to go to -2.0v before seeing ~330 W CRFP. This is usually a 2.5 W amp that is getting real weak but could also be a loose cable in the drive line. We'll have to investigate to find. got the cavity to Mv/m with that 310 W CRFP but that's all it would do. "Need more power Captain". Also got a lot of vacuum activity in cavities 5 and 6 (they are at 3.0 and 4.5Mv/m) that dropped them while tuning cavity 7.

Log Number: 4473453Logbook(s): 

• ELOG

Body: 

Log Number: 4473449Logbook(s): 

• ELOG

Body: 

Scheduled for 3/4.

Log Number: 4473448Logbook(s): 

• ELOG

Body: 

RSEP8, LAM1C, and LAM3C were ramped up to 345MeV values. Shunts were then set to their 345MeV values and went to setpoint without issue. Diagnostic data has been taken and will be reviewed. At the moment, everything is looking good. Box supplies and shunts will be run over the weekend for more run time. ACR7, YBBS06 shunt issues will be looked into further next week.

-O'Brien, Banks

Log Number: 4473444Logbook(s): 

• ELOG

Body: 

Replacing the shunt for YBBS06 and powering on the ARC7 box supply resulted in the same faults as before tripping the supply on Shunt A chain fault. We will need to look further into this and may require accessing the tunnel to look at the shunt lead connections to the magnet.

Log Number: 4473443Logbook(s): 

• ELOG

Body: HALLB=>IOCS has been enabled in alarm handler

wrong hall

Log Number: 4473442Logbook(s): 

• ELOG

Body: HALLB=>IOCS has been disabled in alarm handler

Hall A not running

Log Number: 4473441Logbook(s): 

• ELOG

Body: ACC=>IOCS=>SOUTH_LINAC=>iocsl1b=>camac=>iocsl1b:noXrate has been disabled in alarm handler

I&C investigating this latched alarm

Log Number: 4473440Logbook(s): 

• ELOG
• SRFLOG

Body: 

2L25
- 24V DC connectors reinstalled on beamline valves
- Compressed air solenoids moved to cable racks next Wednesday maintenance day

2L03 - Compressed air solenoids moved to cable racks next Wednesday maintenance day

VDP1L27
- NEG activation and pump cart removed
- VBV1L27A and VBV1L27B valve 24V DC connectors reinstalled

Log Number: 4473439Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Tube recovery not going to well with all these HV on-off's. KCCU gets worse and KMAS back to 2kV with KMAI faulting and dropping HV every turn on. Tube should be replaced soon but KCCU holding close to 1 A should suffice for the low energy run.

Log Number: 4473438Logbook(s): 

• ELOG
• LERFLOG

Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 02-27-26
Time : 15:25:25
Day : Friday
Shift : Swing

Crew Chief : Forman
Program Deputy: Schoene
Team : X
Arm : RADCON
Designated SSO: Yoon
LERF Operator:
Operators : Yoon

This stamp certifies that the above Crew Chief has read/reviewed/received the following: