Aggregator

Log Number: 4472447Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl03

Saved: dthomas 02-22-26 11:06:15 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4472446Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dthomasBody: 

Log Number: 4472445Logbook(s): 

• CLOG
• ELOG

Body: 

R1BXHTPA lower when cavity 5 off than for 1-4.

Also OpsPrd cavs 5/6 and GSET 0 due to 1L11 dropping out of HV again:

Cavity 5 had been back on for ~20 mins. Drops in filament voltage on cavity 5
started when cavity 6 was turned off. Tripped at almost ~15 mins with cavity 6 off.

Cavity 5 filament voltage dropped from 6.1 to 3.9

Log Number: 4472444Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
1L11-6
Username: dthomas
Date/Time: 02-22-26_10:26:31
RF Status: Bad
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Cav 5 low fil volts when cav 6 turns off during heat monster
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4472443Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
1L11-5
Username: dthomas
Date/Time: 02-22-26_10:26:31
RF Status: Bad
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Cav 5 low fil volts when cav 6 turns off during heat monster
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4472442Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Entry Makers: dthomas

Log Number: 4472441Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dthomasBody: 

Cavity 5 had been back on for ~20 mins, drops in filament voltage on cavity 5
started when cavity 6 was turned off. Tripped at almost ~15 mins with cavity 6 off.

Cavity 5 filament voltage dropped from 6.1 to 3.9

Log Number: 4472439Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             02/22/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 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