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QuickPic - 1L11 back up with cavs 5/6 GSET 0
Follow-up Re: 1L11 heat monster? -Plots:HM cavs1-6, filmntV trip cav5
R1BXHTPA lower when cavity 5 off than for 1-4.
Also OpsPrd cavs 5/6 and GSET 0 due to 1L11 dropping out of HV again:
Cavity 5 had been back on for ~20 mins. Drops in filament voltage on cavity 5
started when cavity 6 was turned off. Tripped at almost ~15 mins with cavity 6 off.
Cavity 5 filament voltage dropped from 6.1 to 3.9
The following cavities have been GSET 0: 1L11-6
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
The following cavities have been GSET 0: 1L11-5
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
"Will restore 1L11 and GSET 0 cavs 5 and 6"
1L11 HV trip: cav5 fil vlts low when cav6 off
Operator SIGN IN
QuickPic - RF Captain Screen
QuickPic - Box Supply/Shunt Screens
CREW CHIEF SIGN IN
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:
QuickPic - End of Shift Magnet Screens
The OPS DRVHs for the following cavities have been updated: 2L13-2
2L17 Reduced to Target GSETs
2L19 Reduced to Target GSETs
Pushed 2L14 a bit harder tonight
The OPS DRVHs for the following cavities have been updated: 2L14-3
The OPS DRVHs for the following cavities have been updated:
2L14-3
Username: deir
Date/Time: 02-22-26_05:23:03
RF Status: Good
Tuner Status: Good
Comment: DRVH=8.500 High GASK w/ 0 RATN. Cavity starts to SOS at higher gradients with even without beam.
Previous OPS DRVH: 0
Special Instructions:
The following cavity histories have been updated: 2L16-6
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










