Aggregator
QuickPic - SL Full Survey
Operator SIGN IN
SL CHL going to trip
SLinac/FEL SC1R Planned Trip
FSD Masking Tool: Successful Destination masking to: Inj500KeV
COMPLETED Replace MQPAA25 20A SCE
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-19-26
Time : 07:27:54
Day : Thursday
Shift : Day
Crew Chief : Blackshaw
Program Deputy: Buttles
Team : E
Arm : RadCon
Designated SSO: Janak
LERF Operator:
Operators : Janak
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
RF On/Off turned HV Off
RF On/Off turned HV Off
COMMENT ON Removal and Installation of Girders 2L25A & 2L26A
OLT 1L06-4
QE Measurement
FSD Masking Tool: Successful System UN-Masking for: BeamLossMonitor
Restored RF to zones turned off for FE Onset
The following cavity histories have been updated: 1L07-4
The following cavity histories have been updated:
1L07-4
Username: kprice
Date/Time: 02-19-26_06:18:31
RF Status: Good
Tuner Status: Good
Comment: C100 Bypassed - Not ready in SRM, preventing accidental turn-on
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
CIS Work Summary 02/18/2026
COMMENT ON Post SAM FE onset measurements C75 and C100 cryomodules
Measurements for troublesome zone 1L10, minus cavity 8 (bypassed): https://logbooks.jlab.org/entry/4471961
This zone would likely benefit from some pulse processing/further conditioning. It looked like some of the FE was reducing over time.
1L10 FE Onset
Cavity 1 - Took data twice, first file is probably junk. Cavity seemed to be struggling to tune, but there wasn't much improvement the second time. Started at ~10 MV/m, Decarad 1 ~8000.
Cavity 2 - Had some trouble ramping gradient. Discriminator wanders quite a lot when any change is made.
COMMENT ON Post SAM FE onset measurements C75 and C100 cryomodules
Swing shift took measurements for 1L05 and 1L25:
1L05: https://logbooks.jlab.org/entry/4471928
1L25: https://logbooks.jlab.org/entry/4471931










