Aggregator

Operator SIGN IN

1 day 1 hour ago
Log Number: 4472199Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Chaudhary
DATE:             02/20/2026
SHIFT:               Day

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log
victorc

Operator SIGN IN

1 day 1 hour ago
Log Number: 4472198Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Janak
DATE:             02/20/2026
SHIFT:               Day

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log
janak

Current Stability

1 day 1 hour ago
Log Number: 4472197Logbook(s): Entry Makers: samariBody: 

Over a 10 minute run at 65 uA CW to the Pcub, the current sigma is .25 uA, the maximum value was 65.84 uA, and the min was 64.14 uA.

samari

1L13 released to Ops by SRF.

1 day 1 hour ago
Log Number: 4472193Logbook(s): Entry Makers: michaelmBody: 

1L13 released to Ops by SRF. Everything at ODVH save cav. 2 & 5.
Cavity 2 has trouble regulating; RFCM swap probably necessary (see attached)
Cav.
Cavity 5: Report of KMAI fault during PSS certification.

michaelm

Autolog save

1 day 1 hour ago
Log Number: 4472190Logbook(s): Tags: Body: saver ran from opsl632

Saved: samari 02-20-26 07:43:21 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. Autosave prior to restore.
samari

CREW CHIEF SIGN IN

1 day 2 hours ago
Log Number: 4472186Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 02-20-26
Time : 07:13:06
Day : Friday
Shift : Day

Crew Chief : Humphry
Program Deputy: Buttles
Team : B
Arm : RadCon
Designated SSO: Janak
LERF Operator:
Operators : Janak

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

1L10 Ramped up by Ops

1 day 2 hours ago
Log Number: 4472182Logbook(s): Entry Makers: deirBody: 

Cav 1 at ODVH, no issues.
Cav 2 started showing significant spikes in WG Vac once I got beyond about 13 MV/m. It would recover, but took time. Letting it sit at 14.3 MV/m now. ODVH is 15.2.
Cav 3 at ODVH. Tripped on KRRP High when making the final 0.3 MV/m push to the ODVH. Recovered it and ramped back up to ODVH with no issue.
Cav 4 at 15 MV/m, ODVH is 16 MV/m. Getting arc faults at >15 MV/m.
Cav 5 at ODVH, no issues.
Cav 6, similiar to Cav 2. Letting it sit at 16.6 MV/m. ODVH is 17.0 MV/m.
Cav 7 at ODVH, no issues..

deir

1L06 Heat load / Qo assessment

1 day 2 hours ago
Log Number: 4472180Logbook(s): Entry Makers: dchriBody: 

ATLis https://tasklists.jlab.org/atlis/tasks/119484

Investigating the high heat load in 1L06

Finishing the measurement started on Feb 19th 2026 (see linked ELog)

1Initial JT parameters:
Sample Time = 120
Max Position = 85

Initial Heater parameters:
Requested Heat Watts = 165
LEM Requested RF Heat = 100

STEPS:
1. Reduce ST (JT sample time) to 30s
2. Raise Max Pos to 90%
3. Raise heater 'REQ HEAT WATTS' to 80W
4.

dchri

1L07-5 KCCU drooping

1 day 3 hours ago
Log Number: 4472179Logbook(s): Entry Makers: deirBody: 

Cavit ywas SEL Quenching when transitioning to SELA. Saw it was only reaching about 10.8 MV/m out of the 12 MV/m GSET, so I increased KPOWLim a bit and was able to recover the cavity.

It dropped to SEL again a couple of hours later and started SEL Quenching again when transitioning to SELA. Decided to look into it a bit further...

KCCU has been unstable recently. It was pretty steady up until about 19:30 last night. It started drooping and cavity dropped to SEL. Filament voltage looks steady.

deir

Shift Information

Shift Day
CEBAF Program
MCC Crew Chief Humphry
MCC Operators Thomas
Program Deputy Buttles
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Recent PSS History

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