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The following cavities have been GSET 0: 1L11-6

1 day 8 hours ago
Log Number: 4472444Logbook(s): Tags: 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

dthomas

The following cavities have been GSET 0: 1L11-5

1 day 8 hours ago
Log Number: 4472443Logbook(s): Tags: 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

dthomas

Operator SIGN IN

1 day 10 hours ago
Log Number: 4472439Logbook(s): 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
dthomas

CREW CHIEF SIGN IN

1 day 11 hours ago
Log Number: 4472435Logbook(s): 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:
chumphry

Pushed 2L14 a bit harder tonight

1 day 13 hours ago
Log Number: 4472430Logbook(s): 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.

deir

The following cavity histories have been updated: 2L16-6

1 day 13 hours ago
Log Number: 4472428Logbook(s): Tags: 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

deir

Recovered 2L16-6...RFCM troubles?

1 day 13 hours ago
Log Number: 4472425Logbook(s): 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.

deir

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MCC Operators Chaudhary, Yoon
Program Deputy Buttles
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