Aggregator

Log Number: 4472909Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L25-5
Username: msmith
Date/Time: 02-25-26_04:50:46
RF Status: Good
Tuner Status: Good
Comment: DRVH=9.000 Neutron Dose
Previous OPS DRVH: 12
Special Instructions:

Log Number: 4472906Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Cavity was struggling to come back when turning the zone on following the 1L10-2 FE Onset

Log Number: 4472905Logbook(s): 

• SRFPLASMA
• SRFLOG
• ELOG

Entry Makers: msmithBody: 

As Kitty noted in the linked log, the discriminator wanders quite a bit then takes time to come back in, Cavity 2 is quench limited around 16.5 MV/m.

We tried quench masking to push the gradient a little further but it did not help. Still quenches around 16.5.

Log Number: 4472904Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             02/25/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4472903Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

The highest GSET I can manage without the cavity tripping on CWWT is 6.6 MV/m. Updated ODVH to this value, though it was set at 6 MV/m for this reason at the end of last run.

Log Number: 4472902Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
2L11-2
Username: bschauml
Date/Time: 02-24-26_23:43:36
RF Status: Good
Tuner Status: Good
Comment: DRVH=6.600 Waveguide Window Temperature Fault
Previous OPS DRVH: 0
Special Instructions:

Log Number: 4472901Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-24-26
Time : 23:18:18
Day : Tuesday
Shift : Owl

Crew Chief : Deir
Program Deputy: Buttles
Team : A
Arm : RADCON
Designated SSO: Smith
LERF Operator:
Operators : Smith

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

Log Number: 4472900Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

After using LEMi to increase the GSET of 0L04-8, I set the injector energy to the 4D spectrometer. Dropping 0L04-8 by about 0.2 MV/m put the 4D00.XPOS at 0 mm, and ropping a further 0.1 MV/m put us at the center of the 4D00 viewer.

Log Number: 4472899Logbook(s): 

• ELOG

Tags: 

• Testing

Entry Makers: morroneBody: 

Cav4 Emax= 21 Mv/m. 1 hour run completed and field emissions survey done.
Cav5 Emax not completed. Reached 19.5 Mv/m twice before tripping. Reason undermined.

Turned of RF and HV. Secured for the evening.

Log Number: 4472898Logbook(s): 

• ELOG
• SRFLOG

Body: 

Finished +/- 2kHz loop for cavity 7 then moved to gradient and FE measurement
For cavity 7: reached 22.4 MV/m before cavity quenched. No FE up to this gradient. Completed a one hour run at 21.9 MV/m
For cavity 5: Reached 21.6 MV/m. With a lower loaded Q (1.6E7), we're measuring 6 - 7 kW of Fwd Pwr. Seeing many waveguide vac and arc faults. May just call Emax at 21.6 MV/m.
Some mild FE above 20.5 MV/m ~ 400 mR/hr

Log Number: 4472897Logbook(s): 

• ELOG

Body: 

HYST AREA Version 7-0 has successfully cycled the following:

Area.Injector.Linac

Total Time: 0.617 mins

Log Number: 4472896Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

LEMi 3.12 successfully applied the gradient profile to the injector with an elapsed time of 00:00:02.

Log Number: 4472895Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
0L03-6
Username: bschauml
Date/Time: 02-24-26_21:24:39
RF Status: Good
Tuner Status: Good
Comment: DRVH=7.000 Lowering to raise energy lock cavity GSET
Previous OPS DRVH: 8.5
Special Instructions:

Log Number: 4472894Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
0L03-5
Username: bschauml
Date/Time: 02-24-26_21:24:11
RF Status: Good
Tuner Status: Good
Comment: DRVH=5.000 Lowering to raise energy lock cavity GSET
Previous OPS DRVH: 7
Special Instructions:

Log Number: 4472893Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System Masking for: BeamLossMonitor
User: bschauml
Areas: Injector

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

Log Number: 4472892Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Injector
User: bschauml

Log Number: 4472891Logbook(s): 

• ELOG

Body: 

Most recent set of measurements for 1L05 complete: https://logbooks.jlab.org/entry/4472886

Log Number: 4472890Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Dropping cavities 7 and 8 by 2 MV/m each to increase the graident in 0L04-8 for better regulation

Log Number: 4472889Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
0L03-8
Username: bschauml
Date/Time: 02-24-26_21:04:33
RF Status: Good
Tuner Status: Good
Comment: DRVH=5.000 Lowering to raise energy lock cavity GSET
Previous OPS DRVH: 7.5
Special Instructions:

Log Number: 4472887Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
0L03-7
Username: bschauml
Date/Time: 02-24-26_21:04:05
RF Status: Good
Tuner Status: Good
Comment: DRVH=5.000 Lowering to raise energy lock cavity GSET
Previous OPS DRVH: 9
Special Instructions: