Aggregator

Log Number: 4543337Logbook(s): 

• CLOG
• ELOG

Entry Makers: creelBody: 

Performing various tests this morning some will require starting and stopping the cold compressor train.

Log Number: 4543335Logbook(s): 

• CLOG
• ELOG

Entry Makers: creelBody: 

Summary of events to date

Yesterday, during a sever storm, the SCN 2K cold box tripped.
The system reported multiple problems with Cold Compressor #4 (CC4) magnetic bearing cabinet. The magnetic bearing controls are multi-axis1980's analog control technology.

Log Number: 4543330Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Janak
DATE:             08/15/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4543328Logbook(s): 

• SRFLOG
• CLOG
• ELOG
• RFLOG

Entry Makers: dchriBody: 

JT & cryo heaters returned to previous configuration
Heaters are ramping back to setpoint at 2 watt/min

Continued 2L25 heat-load measurements. Initial Cavity 8 measurements were taken with the JT fixed at 50%, but cryogenic conditions were unstable. Later testing indicated improved flow-meter and linac-pressure stability when the JT was allowed to regulate within approximately 58–62%, and Cavity 1 measurements were taken under this configuration.

Log Number: 4543326Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Log Number: 4543325Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Machine down due to cold box trip. 

Log Number: 4543324Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4543322Logbook(s): 

• POLOG
• ELOG

Body: 
Record

Log Number: 4543321Logbook(s): 

• SRFLOG
• CLOG
• ELOG

Entry Makers: wisslerBody: 

All NLinac and Injector cryomodules have transitioned to 4K and are now at 90% liquid level.

The cause of the CHL2 2K trip will be further investigated in the morning.

Log Number: 4543320Logbook(s): 

• SRFLOG
• CLOG
• ELOG
• RFLOG

Entry Makers: dchriBody: 

ATLis:
https://tasklists.jlab.org/atlis/tasks/120026

Given that operations will be down for the night, I'd like to finish taking data points on 2L25-8 as well as take some repeatability measurements across cavities from previous measurements.

JT valve will be manipulated
Heaters will be adjusted
RF will be on

Log Number: 4543319Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Price
DATE:             08/15/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4543318Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dturnerBody: smartRAT Vpro on opsrfdaqnl1

To view waveforms from a timestamp:

ssh opsrfdaqnl1 "smartRAT -m DAQ -d /data/fast_daq/<timestamp>"


To view waveforms of the top 25 from this report:

ssh opsrfdaqnl1 "smartRAT_view_daily_top25 2026-08-07-2026-08-14"


Data directory: /cs/prohome/apps/s/smartRAT2/pro/fileio/pca_data/output_cavityOutDet/calibrated_cavitylevel_centralize_tsfresh_minimal_gmespmes/whole/rcntnp/2026-08-07-2026-08-14/PCA/

Log Number: 4543317Logbook(s): 

• ELOG
• LERFLOG

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

Date : 08-14-26
Time : 23:14:15
Day : Friday
Shift : Owl

Crew Chief : Howard
Program Deputy: Park
Team : D
Arm : RADCON
Designated SSO: Price
LERF Operator:
Operators : Price

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

Log Number: 4543316Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CEBAF down due to NL 2KCB trip

Log Number: 4543315Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4543314Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

The following box supplies were TURNED OFF by version 2-16 of the Box Supply Cycling Script:
BSY2C Ramp Rate = 8.712 A/s
BSY3C Ramp Rate = 3.818 A/s
LAM3C Ramp Rate = 12.256 A/s

Log Number: 4543313Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

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

RF & NL/SL box supplies OFF

Log Number: 4543312Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Shriner
DATE:             08/14/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4543310Logbook(s): 

• ELOG

Tags: 

• Readme

Entry Makers: eformanBody: 

Log Number: 4543306Logbook(s): 

• DCLOG
• ELOG

Entry Makers: shrinerBody: 

9A17 through 9A32. pics taken approximately 6 hours after sending 70uA 5th pass.