Aggregator

Log Number: 4490604Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Signal going down instead of up with test function on

Log Number: 4490603Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: michaelmBody: 

2L26:
Bay 4 not making it to HV. (Cav. 6/8)
2L26-1 drops zone from HV on high reflected power

ARCs: All 8 arc detectors okay.

IRs:
-Cold test: Cav. 1 non-responsive; cav. 7 responding wrong direction when cold window test actuated. All 8 channels trigger FSD when trip set point below readback.
-Warm test: All 8 warm window test driving voltage down, not up.

Log Number: 4490602Logbook(s): 

• CLOG
• ELOG
• SRFLOG

Log Number: 4490599Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Log Number: 4490597Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

With RF, window heats up - voltage should go up. When test function is actuated, the voltage goes down - which is backwards from the intent - on all 8 channels.

Log Number: 4490596Logbook(s): 

• ELOG

Body: 

Good to go. RRD on-issue.

Log Number: 4490593Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Going more negative instead of positive

Log Number: 4490592Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Log Number: 4490590Logbook(s): 

• ELOG

Body: 

Completed installation of the 500um x 9mm slits.

Log Number: 4490589Logbook(s): 

• CLOG
• ELOG
• SRFLOG

Body: 

Started ramping down heaters at 2L25 in preparation for switchover to local control.

Log Number: 4490588Logbook(s): 

• ELOG

Entry Makers: deirBody: 

At 01:45 last night, the NL dropped to Restricted Lockdown. The iFix alarms panel shows the reason was the personnel door was opened for Exit Stair 1. Checking the door status, it shows the ES1 doors were made up.

I went out to ES1 to check and I didn't see any personnel or vehicles, and the door maglites were illuminated.

When the guards dropped off the door check, it shows that Exit Stair 1 was checked at 01:45. The guards don't have a way to unlock that door, so I'm assuming the door was physically jostled to verify that it was locked, causing the NL to drop to lockdown.

Log Number: 4490587Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Cav. 6/8

Log Number: 4490586Logbook(s): 

• ELOG

Tags: 

• MCC8am

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Started

Log Number: 4490585Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Barker
DATE:             04/23/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4490583Logbook(s): 

• BTLOG
• ELOG
• POLOG

Body: 

Photocathode Anisotropy Measurements:
https://logbooks.jlab.org/entry/4490439

Log Number: 4490582Logbook(s): 

• BTLOG
• POLOG
• ELOG

Body: 

MOLLER Wien symmetry tests:
https://logbooks.jlab.org/entry/4490459

Log Number: 4490580Logbook(s): 

• ELOG

Entry Makers: cryoBody: 

HDR AM WALKS. NOTHING TO REPORT.

Log Number: 4490579Logbook(s): 

• POLOG
• ELOG

Body: 

Daniel and I emptied the barrel in the North West Sump Pit close to the NL gate. Daniel is considering adding a sump pump.

Log Number: 4490578Logbook(s): 

• SRFLOG
• CLOG
• ELOG

Entry Makers: dchriBody: 

mostly took measurements for cavity 1. Will continue tomorrow with remaining cavities.

Log Number: 4490577Logbook(s): 

• ELOG
• SRFLOG

Body: 

Came in and started ramping cryo heaters down. After the slow ramp down, I calibrated the meter to be within tolerance. Initial Calibrations took some time, however, now that it's done it should not need to be redone for the rest of this measurement. I began taking cavity dissipation measurements around 2:30 am. Below are some rough results. More precise results will follow after analyzing the data in detail. However, for now, the below results should suffice. The remaining cavities will be measured tomorrow.