Aggregator

Log Number: 4513329Logbook(s): 

• HCLOG
• ELOG

Entry Makers: bbarkerBody: 

Log Number: 4513327Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: UNMasked Hall C Normal Target FSD

Log Number: 4513326Logbook(s): 

• ELOG

Body: Calibration ParametersHall:CTarget: 10cm DummyPass: 3Note: Calibrated On:2026-Jun-15 07:14Calibrated By: samariFile:C-2026-06-15_0714_10cm_Dummy_Pass-3.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)Compton1,795</td

Log Number: 4513325Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Masked Hall C Normal Target FSD

Log Number: 4513323Logbook(s): 

• ELOG
• LERFLOG

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

Date : 06-18-26
Time : 11:25:22
Day : Thursday
Shift : Day

Crew Chief : Richardson
Program Deputy: Nissen
Team : X
Arm : Barker
Designated SSO: Thomas
LERF Operator:
Operators : Barker, Thomas

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

Log Number: 4513324Logbook(s): 

• HDLOG
• HALOG
• HCLOG
• HBLOG
• ELOG
• SADLOG

Tags: 

• PD

Entry Makers: nissenBody: 

The plan is to go down during the maintenance day next week and do a closer inspection to determine the course of action on repairing/replacing the magnet and beam pipe.

There will be a meeting to plan the maintenance day work at 9:00 am in the MCC conference room on Monday the 22nd.

Log Number: 4513313Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl05

Saved: lrichard 06-18-26 11:24:28 {A:i B:1 C:3 E:1060 A=BS B=CW C=CW D=BS 0R08=70.14 No dumps in.

Log Number: 4513297Logbook(s): 

• ELOG

Entry Makers: dthomasBody: 

Log Number: 4513284Logbook(s): 

• DCLOG
• ELOG

Entry Makers: bbarkerBody: 

Swapping trim card caused mismatch of two djacent channels in this rack. Recovered to setpoint fine, will cycle at next FSD trip.

Log Number: 4513276Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Body: 

these were responding the right way last run. None of the cables or chassis were replaced during the SAM other than the cryomodule. For these two cavities, it is as if we are running with no interlock on the window temperature. Set point for the trip is positive and the readback is negative. This will never trip even if it exceeds -4V

Log Number: 4513272Logbook(s): 

• ELOG

Body: 

The BSList that was performed to verify mitigation:
https://tasklists.jlab.org/bslist/tasks/120407

Log Number: 4513252Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17202Title:
Hall C CH Rack Room Temperatures

Summary:
Hall C's rack room temps are getting very hot, causing the DAQ to not be useable.

Log Number: 4513250Logbook(s): 

• ELOG

Tags: 

• MCC8am

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: xB/C Beam

Log Number: 4513244Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Barker
DATE:             06/18/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4513243Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             06/18/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4513242Logbook(s): 

• ELOG

Entry Makers: samariBody: 

Lowered to 50 and 65% respectively and got nuissance diffuser trips even without the ion chamber current dropping anywhere near the dynamic threshold (see fig 1). I bumped both up 15%, to 65 and 80 % for IC 1 and 2 respectively. I then lowered threshold for IC 1, which doesn't trip all the way down to 20% (fig 2). The behavior seemts to point to something being odd with IC 2? Final settings in fig 3

Log Number: 4513234Logbook(s): 

• HCLOG
• ELOG

Entry Makers: shrinerBody: 

After consulting with experts, Hall staff requested to resume taking data.

Log Number: 4513233Logbook(s): 

• ELOG

Body: 

On the next maintance day, I would like to work with this chassis one more time before closing out this ATLiS / Epass.

Since we had to remove the attenuator boards, the signal read back levels are clipping. I think that I have a solve for this, but it involves swapping out the internal ADC boards with a modified version. I am working with the fab shop to do these changes on some spare boards. My plan would be to perform the board swap in situ (with chassis power off of course) and see if this takes care of the clipping.

Log Number: 4513228Logbook(s): 

• ELOG
• LERFLOG

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

Date : 06-18-26
Time : 07:22:04
Day : Thursday
Shift : Day

Crew Chief : Schoene
Program Deputy: Nissen
Team : B
Arm : Thomas
Designated SSO: Barker
LERF Operator:
Operators : Barker, Thomas

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

Log Number: 4513227Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: xB at 320 nA on H2, xC at 40 uA on 10cm Dummy