Aggregator

Log Number: 4490273Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Anthony
DATE:             04/21/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4490272Logbook(s): 

• ELOG

Body: 

Following the AESRF CPS SOP for safe out of 480 Vac a fault was detected. During lock out at the MDP of the 480 Vac to the CPS the Panduit AVT and the VVU detected a fault that indicated an unsafe condition. At the start of the safe out, all indications are normal on the AVT and VVU. After the breaker is opened at the MDP there is a fault indicated on the AVT, which is two flashes of the indicator. The VVU indicates a fault on the B and C phases. This issue needs to be addressed before Hi-pot testing of the Macro Magnetics transformer can be done. Techs: G. Kepler, A.

Log Number: 4490271Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Gradient/CRFP dropped to nothing as I OLT the cavity. Needs a driveline check to include power from the RFCM, cable checks and 2.5w amp to see what going on !

Log Number: 4490268Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L13-8
Username: kerns
Date/Time: 04-21-26_15:40:51
RF Status: Bad
Tuner Status: Good
Comment: CRFP dropped to nothing during OLT. Needs driveline checks/2.5w amp and RF out of RFCM.
Special Instructions:

Maintenance Tag: Component: Other

Log Number: 4490267Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L13-5
Username: kerns
Date/Time: 04-21-26_15:40:51
RF Status: Bad
Tuner Status: Good
Comment: CRFP dropped to nothing during OLT. Needs driveline checks/2.5w amp and RF out of RFCM.
Special Instructions:

Maintenance Tag: Component: Other

Log Number: 4490266Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: michaelmBody: 

See attached. Could potentially connect network analyzer upstairs and verify one gets no frequency response from tuner motion

Log Number: 4490265Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Tried to OLT when we got to Power Permit and found tuners not tuning with gradient at ~.72 Mv/m with CRFP at 590w . Stepping it 50k in either direction and don't see the tuners moving. This could be a tuner motor stepper camac card or bad/broken tuner motor or torque adapter on tuner on the cryo-module cavity downstairs. Requires further troubleshooting with access for troubleshooting downstairs while tuning from screens or SRF motor stepper test box.

Log Number: 4490264Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L13-8
Username: kerns
Date/Time: 04-21-26_15:33:12
RF Status: Good
Tuner Status: Bad
Comment: Tuner motor not stepping. Needs to be checked by SRF next access.
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4490263Logbook(s): 

• ELOG

Body: 

Reconnected waveguide at 2L02. PSS locks moved from waveguide plates downstairs to CPS breaker in the service building.

Log Number: 4490262Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-04-21 15:22:55 The output from the myRestore execution was as follows: iocsoftw4spce systemEnum@2026-04-21 15:22 2(2) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocsoftw4spce (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success

Log Number: 4490261Logbook(s): 

• ELOG
• LERFLOG

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

Date : 04-21-26
Time : 15:24:35
Day : Tuesday
Shift : Swing

Crew Chief : Price
Program Deputy: Ogur
Team : C
Designated SSO: Anthony
LERF Operator:
Operators : Anthony

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

Log Number: 4490260Logbook(s): 

• ELOG
• RFLOG

Body: 

2L08-3
Marked for filament volts high; Allowed the filaments to warm up for awhile prior to turning on HV. Cavity recovered without issue.

Log Number: 4490259Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Started unbypassing and unGSET0 zones follow the Atlis

Log Number: 4490258Logbook(s): 

• ELOG

Body: 

DC Power has now completed all tasks up to #11. DCP verified the LCW flow at the magnet before all testing. We hi-potted the isolated magnet to 1.35 kV DC, with a maximum leakage current of 510 μA. Resistance and inductance measurements were performed and are attached to this ATLis. YBBS06 shunt leads were reconnected to the magnet, and current was driven through the magnet using a benchtop power supply to verify shunt operation. We verified shunt operation by setting the module setpoint and driving the module. Everything was as expected and operational.

Log Number: 4490257Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4490256Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L08-3
Username: evonda
Date/Time: 04-21-26_15:16:40
RF Status: Good
Tuner Status: Good
Comment: Allowed filaments to warm up for awhile prior to turning on HV. Cavity covered without issue.
Special Instructions:

Maintenance Tag: Component: Other

Log Number: 4490251Logbook(s): 

• ELOG

Body: 

Performed MPS documentation checks of BLM cable penetrations in Injector and East Arc regions (4/20). Investigated FSD wiring in Tagger Service Building for Beam Transport Monitor and Amorphous Radiator with Hall D (4/21). Updated MPS documentation accordingly. S. Bruhwel, L. Krylach, L. Leung

Log Number: 4490250Logbook(s): 

• ELOG

Body: 

Task approved by work supervisor.
Prejob brief complete.

Log Number: 4490247Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-04-21 14:29:34 The output from the myRestore execution was as follows: iocsb4b systemEnum@2026-04-21 14:29 2(2) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocsb4b (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success

Log Number: 4490246Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

LOPW was varying between ~160mw and 260 mw. Replaced RFCM to correct LOPW and restored and optimized cavity RF at ODVH= 10Mv/m.