Aggregator

Log Number: 4543521Logbook(s): 

• ELOG
• DCLOG

Body: 

MMA1H01 was ramped to 550A; diagnostic data was taken for review. This is the maximum output that the supply can produce with the limited AC input breaker of 225A. While running at 550A, the AC draw on the three phases is ~223A. This completes the work for MMA1H01

Log Number: 4543520Logbook(s): 

• ELOG
• LERFLOG

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

Date : 08-18-26
Time : 08:27:57
Day : Tuesday
Shift : Day

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

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

Log Number: 4543518Logbook(s): 

• ELOG

Tags: 

• MCC8am

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Machine down due to north linac cold compressor 4 issu

Log Number: 4543515Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Humphry
DATE:             08/18/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4543514Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Hall C taken to restricted. SL and 0L02 CPS keys set to disabled.

Log Number: 4543513Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4543511Logbook(s): 

• ELOG

Body: 

Attached.

Log Number: 4543509Logbook(s): 

• ELOG

Entry Makers: dchri

Log Number: 4543508Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             08/18/2026
SHIFT:               Owl

Operator Comments: MCC -> reduced staffing (SSO+ Crew Chief) per AOD 3.4.2.1

RF & NL/SL box supplies OFF

The operator has read the following:

Log Number: 4543507Logbook(s): 

• ELOG

Entry Makers: beneschBody: 

Only 10% of the FSDs were BLM-only.

Log Number: 4543506Logbook(s): 

• ELOG

Tags: 

• Autolog
• MCC8am

Body:  */ ATLis Comments Posted 18:00 Sunday August 16 through 18:00 Monday August 17 AES DC power Systems check feasibility of 550 MeV/linac with shunt resistor plates

2026-08-17 10:08 - Onish Kumar

Log Number: 4543505Logbook(s): 

• DCLOG
• ELOG

Entry Makers: yoonBody: 

at request of DC power

Log Number: 4543504Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             08/17/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4543499Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Machine down due to north linac cold compressor 4 issues.

Log Number: 4543498Logbook(s): 

• ELOG
• LERFLOG

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

Date : 08-17-26
Time : 15:40:13
Day : Monday
Shift : Swing

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

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

Log Number: 4543497Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4543494Logbook(s): 

• ELOG

Entry Makers: mmerzBody: 

In line with AOD 3.4.2.1, with CEBAF & the LERF being in Power Permit or below, staffing is being reduced to a single Operator, a Crew Chief on call, & a security guard. FC2 is (still) locked in.

https://jeffersonlab.sharepoint.com/sites/OpsDocs/Docs/accel_ops_directi...

Log Number: 4543491Logbook(s): 

• ELOG

Entry Makers: bjacobBody: 

This is to prevent RF HV turn on as high power RF authorization has been removed.

Log Number: 4543488Logbook(s): 

• ELOG
• LERFLOG

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

CREW CHIEF COMMENTS: On Call

Date : 08-17-26
Time : 15:19:19
Day : Monday
Shift : Swing

Crew Chief : Merz
Program Deputy: Park
Team : X
Arm : RadCon
Designated SSO: as Scheduled
LERF Operator:
Operators : SSO Swg: Yoon, Owl: Christian

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

Log Number: 4543485Logbook(s): 

• ELOG

Tags: 

• Readme

Body: [figure:1] Always check the Authorization web application for the latest status: JLab Authorization Manager