Aggregator

Log Number: 4503840Logbook(s): 

• ELOG

Body: Calibration ParametersHall:DTarget: JD70-107 55um 45/135 degPass: 5.5Note: Calibrated On:2026-May-03 18:47Calibrated By: alexsFile:D-2026-05-03_1847_JD70-107_55um_45_135_deg_Pass-5.5.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4503839Logbook(s): 

• FMLOG
• ELOG

Entry Makers: dchriBody: 

experts contacted and looking into it. Voltage is dancing around it's limit HIHI setpoint of ~500. Will continue to monitor

Log Number: 4503838Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

contacted facilities

Log Number: 4503833Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: jhoward 05-24-26 23:13:57 {A:i B:5 C:3 E:345 A=BS B=CW C=CW D=CW 0R08=61.20 No dumps in.

Log Number: 4503832Logbook(s): 

• ELOG
• LERFLOG

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

Date : 05-24-26
Time : 23:13:04
Day : Sunday
Shift : Owl

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

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

Log Number: 4503831Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW to halls B, C, and D.

Log Number: 4503829Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4503826Logbook(s): 

• HDLOG
• ELOG

Entry Makers: yoonBody: 

Log Number: 4503825Logbook(s): 

• ELOG

Body: Calibration ParametersHall:DTarget: 1.1x10-3 Al 100umPass: 5.5Note: Calibrated On:2026-May-02 07:48Calibrated By: msmithFile:D-2026-05-02_0748_1.1x10-3_Al_100um_Pass-5.5.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)East Wa

Log Number: 4503818Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

recovering on its own

Log Number: 4503813Logbook(s): 

• ELOG
• LERFLOG

Body: The following entry was placed in the Accelerator Bypassed-Interlocks Log (ABIL) Device: OM207 Function: Oxygen Monitor Location: LERF Tunnel - Zone 04 Purpose: Repeated False alarms. Ops investigated area and found no ODH hazards. No Adjacent heads bypassed Exp.

Log Number: 4503812Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

Adjacent heads still active (203 & 204).

Ops responders investigated and declared LERF vault to have no ODH hazards present

OM207 bypassed.

Log Number: 4503808Logbook(s): 

• ELOG

Entry Makers: eforman

Log Number: 4503802Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

Fig. 1
Noticed A3 interception would gently rise into FSD trip again and again. Eventually, A3 interception will hit a peak of ~0.5 and plummet to essentially zero.

Fig. 6,7
Repeated BLA trips from suspected injector discharge

Once after beam is restored, A4 interception will spike up and then drop by ~30% or so and flatten out

Some following trends to the A3 rise are shown in the Figures below,

BPM 0I05
BPM 0L09
Hall D current and Ion Chambers
...

Log Number: 4503800Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

Log Number: 4503796Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             05/24/2026
SHIFT:               Swing

The operator has read the following:

Log Number: 4503791Logbook(s): 

• ELOG

Entry Makers: janakBody: 

No current change

Log Number: 4503780Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

Noticed the 1A SLM looked terrible and 6S01 IDX was increasing, so tried to fix that. The spot looked much better after moving the NL GP knob to the left, but I noticed a spike in 6R10 and 5S01 IDX so I backed off some of those changes. Beam doesnt look as nice on the SLM but the IDX rates were better.

Fig 1) 1A SLM before
Fig 2) 1A SLM after first correction
Fig 3) 1A SLM after backing off some of the corrections
Fig 4) plot of these 3 IDX vs GP
Fig 5) IDX summary after adjustments

Log Number: 4503765Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L05-4
Username: eforman
Date/Time: 05-24-26_16:51:49
RF Status: Good
Tuner Status: Good
Comment: DRVH=18.700 Tripping frequently & suspect beam instability when running 60 uA to xC
Previous OPS DRVH: 19
Special Instructions: to run LEM at 940

Log Number: 4503762Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             05/24/2026
SHIFT:               Swing

The operator has read the following:

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