Aggregator

Log Number: 4543271Logbook(s): 

• ELOG

Body: INJECTOR=>VACUUM=>INJ-L=>VIP0L01 has been disabled in alarm handler

chattering

Log Number: 4543270Logbook(s): 

• SRFLOG
• ELOG

Entry Makers: beneschBody: 

Install an Agilent system during the SAM. 1L07 and 1L23 not great either, figure 2. Four pumpdown attempts so far, lower right of figure 3.

Log Number: 4543269Logbook(s): 

• POLOG
• ELOG

Entry Makers: eformanBody: 

Cryomodule 0L04 appears to be depleated of cryogen (liquid level = 0) as a consequence of the 2KCB trip. Insulating vacuum on that one has risen to 1e-3.

Log Number: 4543266Logbook(s): 

• CLOG
• ELOG

Entry Makers: thilanBody: 

Attempting pumpdown of NLinac

Log Number: 4543260Logbook(s): 

• POLOG
• ELOG

Entry Makers: alexsBody: 

Appears to have started at VIP0L01, then spread. Beam and RF had not been on for a while due to the CHL trip. Valves have been closed out of an abundance of caution. CIS on call is on the way in to investigate.

Log Number: 4543248Logbook(s): 

• ELOG
• LERFLOG

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

Date : 08-14-26
Time : 15:28:08
Day : Friday
Shift : Swing

Crew Chief : Forman
Program Deputy: Park
Team : X
Arm : Anthony
Designated SSO: Shriner
LERF Operator:
Operators : Anthony, Shriner

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

Log Number: 4543249Logbook(s): 

• ELOG

Entry Makers: bjacobBody: 

Noticed a lot of oscillation in the 1A SLM during the thunderstorm @~1320. Spent some time looking for bad actors but then noticed the beam spot looked quite different as well so I tried adjusting NL gang phase. Found it had shifted 4 degrees.

Log Number: 4543242Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW beam to B/C/D

Log Number: 4543239Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4543235Logbook(s): 

• ELOG

Body: 

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

Area.Linacs.South

Total Time: 3.133 mins

Log Number: 4543232Logbook(s): 

• ELOG
• CLOG

Tags: 

• Autolog

Body: LEM 9.19.5 was successfully run for the South Linac on 2026-08-14 15:05:31. The application phase took 00:01:38 to complete.

Log Number: 4543228Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been UnGSET 0:
2L11-7
Username: alexs
Date/Time: 08-14-26_15:02:31
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Recovered to drive high after klystron arc
Special Instructions:

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

Log Number: 4543224Logbook(s): 

• ELOG

Entry Makers: bjacobBody: 

Made in accordance with AOD section 4.2.5.2

Log Number: 4543189Logbook(s): 

• ELOG

Entry Makers: bbarkerBody: 

Halls have been informed. Cryo has aprised MCC of their ongoing diagnosis and recovery efforts. Hall D wants to access their hall opportunistically now that beam will be down for some time.

Log Number: 4543183Logbook(s): 

• CLOG
• ELOG

Log Number: 4543182Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17671Title:
2K Cold Box Trip Takes Down N.Linac RF

Summary:
Many systems unhappy as thunder frequency increased during this current storm. Seems to have stressed NL/cryo enough to trip 2K cold box.

Log Number: 4543143Logbook(s): 

• HDLOG
• ELOG

Entry Makers: alexsBody: 

When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.

Log Number: 4543142Logbook(s): 

• HCLOG
• ELOG

Entry Makers: alexsBody: 

When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.

Log Number: 4543141Logbook(s): 

• HCLOG
• ELOG

Entry Makers: alexsBody: 

When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.

Log Number: 4543084Logbook(s): 

• ELOG
• LERFLOG

Tags: 

• ShiftSummary

Body:  LERF SHIFT LOG Summary

Start of shift: LERF to Power Permit.