Aggregator

Log Number: 4515777Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

RF on call would need to pull a jumper to get the zone back, but we have enough energy in the South to get beam back to the Hall until the maintenance day where this can be addressed.

Log Number: 4515776Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

no beam to anyone

Log Number: 4515775Logbook(s): 

• ELOG
• LERFLOG

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

Date : 06-23-26
Time : 23:15:50
Day : Tuesday
Shift : Owl

Crew Chief : Howard
Program Deputy: Nissen
Team : D
Arm : Chaudhary
Designated SSO: Christian
LERF Operator:
Operators : Price, Chaudhary, Christian

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

Log Number: 4515774Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

Log Number: 4515773Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Beam halted due to closed vacuum valves and Hall C dump LCW.

Log Number: 4515772Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 8 0 0

Log Number: 4515771Logbook(s): 

• HBLOG
• ELOG

Entry Makers: bschaumlBody: 

With Hall B going back to such low current I turned off the energy lock.

Log Number: 4515770Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Zone dropped HV on cavity 1 KMAI and did so two more times when we attempted to restore HV though it is already bypassed. RF on-call has been contacted and is looking into it.

Log Number: 4515769Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17263Title:
2L02-1 KMAI fault dropped zone out of HV, round 2

Summary:
somehow, cavity 1 KMAI faults are dropping the zone out of HV while this cavity is bypassed.

Log Number: 4515767Logbook(s): 

• HBLOG
• ELOG

Entry Makers: yoonBody: 

Log Number: 4515766Logbook(s): 

• HBLOG
• ELOG

Entry Makers: yoonBody: 

Log Number: 4515764Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

Log Number: 4515760Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

just came back up from a short downtime due to 2L02-1, GP corrected afterwards

Log Number: 4515756Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Didn't check pathlength because we've got no lengths of paths to worry about at pass one, hon!

Log Number: 4515755Logbook(s): 

• ELOG

Body: 

HYST AREA Version 7-0 has successfully cycled the following:

Area.Linacs.South

Total Time: 3.133 mins

Log Number: 4515754Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17262Title:
2L02-1 KMAI fault dropped zone out of HV

Summary:
unable to recover cavity, bypassingDuration:
6 minutes

Time Down:
23-Jun-2026 21:50

Time Up:
23-Ju

Log Number: 4515753Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: eforman
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
ILM

Log Number: 4515752Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: bschauml
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
IL

Log Number: 4515751Logbook(s): 

• ELOG
• CLOG

Tags: 

• Autolog

Body: LEM 9.19.5 was successfully run for the South Linac on 2026-06-23 21:57:04. The application phase took 00:00:43 to complete.

Log Number: 4515750Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been bypassed:
2L02-1
Username: bschauml
Date/Time: 06-23-26_21:55:41
RF Status: Bad
Tuner Status: Good
Comment: Bypassed - stepped off +100k - KMAI Faults
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME, Component: Operator Entry - See SME