Aggregator
OMB01, ABIL tag #9409, Expected Removal Date changed.
OM2, ABIL tag #8249, Expected Removal Date changed.
COMMENT ON Routine Maintenance of ODH Systems (Managed by SSG).
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 03-09-26
Time : 15:45:37
Day : Monday
Shift : Swing
Crew Chief : Richardson
Program Deputy: Schoene
Team : X
Arm : Shriner
Designated SSO: Shenenberger
LERF Operator:
Operators : Shenenberger, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
MXM3S03 Appears to reach proper current with new coefficient in place
Follow-up Re: IIX1L02_gDsRt increased at 1420
COMMENT ON RF work for 2026 HCO
COMMENT ON PSS Video System Upgrade
The following cavity histories have been updated: 1L23-8
The following cavity histories have been updated:
1L23-8
Username: kerns
Date/Time: 03-09-26_15:18:08
RF Status: Bad
Tuner Status: Good
Comment: Needs filament board replaced. Causing HV drops.
Special Instructions:
Maintenance Tag: Component: Filament Board
1L23-8 Dropping HV
Filament board was suspected to be bad back on Feb 12,2026 but was never replaced as DEIR stated in ELOG 4474925. It has been dropping HV due to filament readback problem which requires a new filament bd. that we didn't have one for replacement. It will run for a while if left in HV but eventually we need to get a C100 filament bd. in it so the HV will quit dropping !! Will also need to check new filament fiber or fiber to copper connections before it is taken out of HV.
COMMENT ON Hall C Vacuum Controls HCO/Troubleshooting
Replaced Valve FSD Chassis for Hall C with upgraded spare.
After replacing found a missing ground issue that prevented correct readbacks for valve positions.
Fixed and showing good readbacks.
Tomorrow will continue further HCO/Troubleshooting in Hall C.
IOC channel access required for srf commissioning
ODH Mobile Units - Sensor Aging Alarm
The following cavity histories have been updated: 1L12-6
The following cavity histories have been updated:
1L12-6
Username: holben
Date/Time: 03-09-26_14:58:17
RF Status: Bad
Tuner Status: Good
Comment: Replaced Klystron L3 #206 with Stellant #228. Waiting to be tested.
Special Instructions: , HPA breaker tripped
Maintenance Tag: Component: Tube {Removed SN: L3 #206, Replacement SN: Stellant #228}
IIX1L02_gDsRt increased at 1420
GMES sum didn't change from period before it was turned off. Higher gamma rate coincided with restoration of gradient. I believe the electrometer was supposed to be swapped today but I deleted the ATLis email so I can't be sure. Dose rate is back down now.
Box Supplies Turned on and Cycled Once
The following box supplies were TURNED ON AND CYCLED ONCE by version 2-16 of the Box Supply Cycling Script:
ARC1A Ramp Rate = 7.400 A/s
ARC3A Ramp Rate = 9.294 A/s
ARC5A Ramp Rate = 9.307 A/s
ARC9A Ramp Rate = 8.832 A/s
RSEP9A Ramp Rate = 4.865 A/s
COMMENT ON Gun2 photocathode Heat and Activation - March 2026
COMMENT ON RF work for 2026 HCO
East Arc Box supplies are good to turn on
Received word from Operability that the LCW manifold was put back in place. The East Arc Box supplies are good for turn on. Arc 1, 3, 5, 9, and RSEP9.
Arc 7 still a no go due to YBBS06.
DC power has pulled out E-Stop on the affected box supplies so we can turn them on remotely.










