Aggregator

Log Number: 4472205Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Please see attached. Issue tracked over from last run. Recommend remeasuring signal levels and swapping RFCM as J. Settle recommended if issue persists.

Log Number: 4472203Logbook(s): 

• ELOG

Tags: 

• MCC8am

Body:  PD SUMMARY

Injector: Low-E optics setup to ILD -- proving challenging from the booster on. 

Log Number: 4472201Logbook(s): 

• ELOG
• RADLOG

Entry Makers: chumphryBody: 

Log Number: 4472199Logbook(s): 

• ELOG
• LERFLOG

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

Log Number: 4472198Logbook(s): 

• ELOG
• LERFLOG

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

Log Number: 4472197Logbook(s): 

• POLOG
• ELOG

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.

Log Number: 4472196Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Beam current stability

Log Number: 4472193Logbook(s): 

• ELOG

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.

Log Number: 4472192Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Reported by C. Kerns during PSS certification.

Log Number: 4472191Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632
Data from: /usr/opdata/burt/allsnap/02-10-26_17:08:12
Restored file: /tmp/02-20-26_07:43:40.snap

Log Number: 4472190Logbook(s): 

• ELOG

Tags: 

• Autolog

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.

Log Number: 4472189Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: samari
Areas: Injector

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09

Log Number: 4472188Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: High Voltage was turned off for:
R22
R23
R24
R25
R26
R27
R28
R29
R2A
R2B
R2C
R2D
R2E
R2F
R2G
R2H
R2I
R2J
R2K
R2L
R2M
R2N
R2O
R2P
R2Q

Log Number: 4472187Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4472186Logbook(s): 

• ELOG
• LERFLOG

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:

Log Number: 4472185Logbook(s): 

• ELOG

Body: 

Reduced 1L14, 1L15, 1L16, 1L17, and 1L18 to Target GSets (as opposed to ODVH) identified in the spreadsheet to improve heater margin in the NL.

Log Number: 4472182Logbook(s): 

• ELOG
• RFLOG

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..

Log Number: 4472181Logbook(s): 

• ELOG

Body: 

Measurement finished with all cavities 2 through 8 measured

More details in the ELog https://logbooks.jlab.org/entry/4472180

Log Number: 4472180Logbook(s): 

• CLOG
• ELOG
• RFLOG
• SRFLOG

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.

Log Number: 4472179Logbook(s): 

• ELOG

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.