Aggregator

Log Number: 4516271Logbook(s): 

• ELOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - x Sigma: 0.0963 Peak 2 - u Sigma: 0.1128 Peak 3 - y Sigma: 0.1495

Log Number: 4516270Logbook(s): 

• ELOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - x Sigma: 0.1134 Peak 2 - u Sigma: 0.1163 Peak 3 - y Sigma: 0.2341

Log Number: 4516268Logbook(s): 

• ELOG

Body: Results where Job # is 1026 {29} CAVITY PHASE ERROR (DEGREES) OUTCOME PHASE (DEGREES) START DATE DURATION (SECONDS) CORRECTION DATE CORRECTION ERROR REASON 2L20-8 BYPASSED 24-Jun-2026 23:59 0 24-

Log Number: 4516267Logbook(s): 

• ELOG

Body: 

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

Area.Linacs.South

Total Time: 3.133 mins

Log Number: 4516266Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17272Title:
1L23-8 tripping zone out of HV, despite being bypassed

Summary:
RF is taking a look at it. Trip level modified.

Log Number: 4516264Logbook(s): 

• ELOG
• CLOG

Tags: 

• Autolog

Body: LEM 9.19.5 was successfully run for the South Linac on 2026-06-24 23:35:39. The application phase took 00:00:13 to complete.

Log Number: 4516265Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Log Number: 4516263Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
2L20-8
Username: bschauml
Date/Time: 06-24-26_23:33:00
RF Status: Good
Tuner Status: Good
Comment: DRVH=0.000 GSET0 for no CRFP while open loop tuning. Cavity History crashed so I'm making this entry.
Previous OPS DRVH: 4.5
Special Instructions:

Log Number: 4516261Logbook(s): 

• ELOG
• LERFLOG

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

Date : 06-24-26
Time : 23:30:35
Day : Wednesday
Shift : Owl

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

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

Log Number: 4516259Logbook(s): 

• ELOG
• RFLOG

Entry Makers: yoonBody: 

Log Number: 4516258Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Injector optimization in progress.

Log Number: 4516257Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 4 0 0

Log Number: 4516256Logbook(s): 

• ELOG
• RFLOG

Entry Makers: bschaumlBody: 

These two iocs show up in the alarm hadnker with low free memory alarms and the button to reboot them does not show up. They appear to be functioning normally and only have building temperature info on them.

Log Number: 4516255Logbook(s): 

• ELOG

Entry Makers: yoon

Log Number: 4516254Logbook(s): 

• ELOG

Body: 

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

Area.Linacs.South

Total Time: 3.133 mins

Log Number: 4516253Logbook(s): 

• ELOG
• CLOG

Tags: 

• Autolog

Body: LEM 9.19.5 was successfully run for the South Linac on 2026-06-24 22:59:34. The application phase took 00:00:07 to complete.

Log Number: 4516252Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

got alot out of 2L04-7, about to run phaser

Log Number: 4516251Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

Log Number: 4516250Logbook(s): 

• ELOG

Body: 

RF maintenance day summary

NL( +10MeV from the maintenance work )

1L07-1 FCC replacement 

1L09-2 Tube replacement +5.7MeV

1L09-5 removed attenuation and Klystron characterization

1L20-1 2.5w drive amp replacement +4.3

1L21-5 Arc detector work 

SL (+43MeV from the maintenance work)

2L02- 2,3,4,5,6,7,8 recovery after cavity 1 T/S +25.2MeV

2L07-4 Arc detector work +3.7MeV

2L20-8 recovery +2.2MeV

2L25-FCC replacement

2L26-3 Bay 1HV recovery +12.2 MeV

While bringing back the machine we they had to bypass 1L23-8 (high KCCU -4.2MeV) and few cavities in 2L03 and 2L05( for 120Hz oscillati

Log Number: 4516249Logbook(s): 

• ELOG

Entry Makers: jktxgomezBody: 

recovering 2L03 and 2L05 after the maintenance day took more time than expected. Cavities were unstable and can't stay in SELAP . Looking at the waveforms all cavities had 120 Hz component in GMES and PMES.
At this point it had to be the fcc power supply chassis or the power supply for the pre-amplifier possibly causing this. We had seen something similar in 1L03 in the past.

Xavier went to the zones and measured the ripple on the 24 V power supply for multiple zones in SL

2L03
DC value 23.6 V, AC 0.572 V