Aggregator

Log Number: 4487654Logbook(s): 

• ELOG
• LERFLOG

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

Date : 04-15-26
Time : 07:33:33
Day : Wednesday
Shift : Day

Crew Chief : Humphry
Program Deputy: Ogur
Team : E
Arm : RadCon
Designated SSO: Blackshaw
LERF Operator:
Operators : Blackshaw, Janak

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

Log Number: 4487653Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16729Title:
0L03 HV not restoring

Summary:
Cavity 4's KMAI spikes when trying to bring the zone into HV, even with the cavity bypassed, keep preventing the zone going into HV.

Log Number: 4487652Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: South Linac RF down while RF on call worked on swapping the LO amp.&nbs

Log Number: 4487649Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4487646Logbook(s): 

• ELOG

Entry Makers: victorcBody: 

Log Number: 4487642Logbook(s): 

• ELOG

Tags: 

• Readme

Entry Makers: beneschBody: 

with 0L03-4 off, MQS0L04 should be reduced to 15.74 if you don't run lemi.

Based on my experience, the odds that you'll have to rematch the injector to North Linac after removing the early RF focusing are at least even.

Log Number: 4487638Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Once we get 0L03 back, we'll need to phase 0L04-7 before attempting to recover beam into the main machine. Injector on-call recommended setting up to the 4D as the most straightforward way to phase this cavity.

Log Number: 4487637Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dchriBody: 

Zone tripped HV while UnBypassing 0L04-7. However, was able to get 0L04-7 on and have it currently sitting at 5MV/m (GDR) with HV restored

As for 0L03, seems like even after bypassing 0L03-4 the zone is still not going into HV. So perhaps efforts to bring up 0L04-7 were in vain?

Letting 0L04 sit with cav 7 on for now. However, will likely Bypass it if 0L03 HV and cav 4 comes back

Log Number: 4487636Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Injector
User: kprice

Log Number: 4487635Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16729Title:
0L03 HV not restoring

Summary:
Cavity 4's KMAI spikes, even bypassed, keep tripping the zone out of HV.

Log Number: 4487634Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Body: 

Cavity will have to be bypassed. Conditions have changed for #4 Klystron. KMAV has increased and the tube is still not responding to changes in Mod Anode settings.

Log Number: 4487630Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
0L04-7
Username: dchri
Date/Time: 04-15-26_06:10:05
RF Status: Good
Tuner Status: Good
Comment: C100 Unbypassed - to make up for loss of 0L03-4
Special Instructions:

Maintenance Tag: Component: Other

Log Number: 4487629Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16728Title:
0L03 Dropped HV

Summary:
Zone dropped on HPA overload; now cavity 4 KMAI appears to be preventing zone from recovering into HV. Contacted RF on call; they are working to diagnose. Edit: SME could not recover cavity.

Log Number: 4487627Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been bypassed:
0L03-4
Username: kprice
Date/Time: 04-15-26_06:06:09
RF Status: Bad
Tuner Status: Good
Comment: Bypassed - stepped off +100k - Klystron, KMAI preventing zone from recovering into HV
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4487625Logbook(s): 

• DCLOG
• ELOG

Entry Makers: victorcBody: 

Log Number: 4487622Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Log Number: 4487621Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: CryoModule
User: kprice
Areas: All

CryoModule Devices:
0L02
0L04
0L03
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26

Log Number: 4487620Logbook(s): 

• POLOG
• ELOG

Body: Spot Location: (13250,19250), Charge: 12.508439999999995

Laser Wavelength Atten Setting Laser Power Current HV PS Current QE PV Updated? Update Time/Reason Not Updated (nm) (W) (uA)</

Log Number: 4487618Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System Masking for: CryoModule
User: kprice
Areas: All

CryoModule Devices:
0L02
0L04
0L03
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26

Log Number: 4487615Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Entry Makers: dchriBody: 

FIG.1
first trip
Hpa overload

FIG.2,3
second trip
KMAI fault cav 4

FIG.4
KMAI fault cav 4

Will likely have to contact experts