Aggregator

Log Number: 4472437Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4472436Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4472435Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-22-26
Time : 07:12:45
Day : Sunday
Shift : Day

Crew Chief : Humphry
Program Deputy: Buttles
Team : X
Arm : RadCon
Designated SSO: Thomas
LERF Operator:
Operators : Thomas

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

Log Number: 4472434Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Log Number: 4472433Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
2L13-2
Username: deir
Date/Time: 02-22-26_05:44:38
RF Status: Good
Tuner Status: Good
Comment: DRVH=8.800 Quenching at 8.9
Previous OPS DRVH: 0
Special Instructions:

Log Number: 4472432Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Lem Req Heat reduced to 31

Log Number: 4472431Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Lem Req Heat adjusted to 30

Log Number: 4472430Logbook(s): 

• ELOG
• RFLOG

Entry Makers: deirBody: 

Cavs 2 & 5 still only Checked in SRM.

Pushed 4,7,8 to ODVH. LEM REQ Heat at 87W per LEM.

Changed Cav 3 ODVH to 8.5 MV/m. Cavity starts to SOS and lose regulation above 9 MV/m. Even at 8.5 MV/m with no beam and 0 RATN, GASK is ~2.5 V.

Log Number: 4472429Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
2L14-3
Username: deir
Date/Time: 02-22-26_05:23:03
RF Status: Good
Tuner Status: Good
Comment: DRVH=8.500 High GASK w/ 0 RATN. Cavity starts to SOS at higher gradients with even without beam.
Previous OPS DRVH: 0
Special Instructions:

Log Number: 4472428Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L16-6
Username: deir
Date/Time: 02-22-26_05:14:00
RF Status: Bad
Tuner Status: Good
Comment: Cavity TDETA is stable at gradients >6.5 MV/m, but RFCM should probably be checked out. Could be run at lower gradients with tuner in manual. Leaving it GSET0 for now: https://logbooks.jlab.org/entry/4472425
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4472427Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

LEM Req Heat adjusted to 47

Log Number: 4472426Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

LEM Req Heat adjusted to 35

Log Number: 4472425Logbook(s): 

• ELOG
• RFLOG

Entry Makers: deirBody: 

Did an OLT and recovered it at 3.5 MV/m. CFQEA and GMES were unstable during the OLT process, CFQEA moreso. It was oscillating by as much as +/-20 deg. I chose a spot where GMES was the most stable and recovered it there while keeping the tuner in manual.

Forward power readback seemed to be responding and was steady. GMES and GASK also steady with loops closed. Cavity CFQEA/TDETA was highly unstable. Decided to try and ramp the cavity up a bit using the CRFP readback to keep it tuned and ignoring TDETA/CFQEA.

Recovered the cavity at 6.9 MV/m.

Log Number: 4472424Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
2L14-4
Username: deir
Date/Time: 02-22-26_03:48:11
RF Status: Good
Tuner Status: Good
Comment: DRVH=10.300 Consistent true arcs at 10.5
Previous OPS DRVH: 0
Special Instructions:

Log Number: 4472423Logbook(s): 

• ELOG

Body: 

It's the dehumidifier behind Exit Stair 1.

Went out and took a look at NL2 MDP. It also powers the breaker panel inside Exit Stair 1, so I was immediately suspicious. Checked outside the building and, sure enough, there was a dehumidifier. I called the control room and got an estimate for when the oscillations would start again and stood outside by the dehumidifier for that length of time. The dehumidifier turned on and I called the control room back to confirm if the forward power oscillations started again. They had.

Log Number: 4472422Logbook(s): 

• ELOG

Body: 

Looks like whatever is causing it is connected to the NL2 MDP.

Log Number: 4472421Logbook(s): 

• SRFLOG
• CLOG
• ELOG
• RFLOG

Entry Makers: deirBody: 

Reduced LEM REQ Heat to 45 W

Log Number: 4472420Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             02/22/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4472419Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Adjusted LEM REQ Heat per a hypothetical LEM

Log Number: 4472418Logbook(s): 

• ELOG
• POLOG

Body: