Aggregator
West Arc LCW: Lowering Flow
A weld crack has been found on the North Cooling Tower for the West Arc LCW. Facilities is reducing the West Arc LCW flow at this time to reduce build-up of heat and the crack worsening. They'll then begin T/Sing. ATLis forthcoming.
iocsl05rfcry restored
IOC MAC address change
Southeast Linac JTs
Southeast Linac JT valves for 2L05-2L13 (2L02-2L04 are warm) were manually set to 5% less than their current position ahead of the Southeast Linac power outage. The JTs will be frozen during the outage so this was done to avoid overfilling.
Cryomodules will be refilled as necessary after the power outage.
Program Deputy Summary, presented 2025-11-20
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 11-20-25
Time : 07:55:29
Day : Thursday
Shift : Day
Crew Chief : Blackshaw
Program Deputy: Rothe
Team : E
Arm : RadCon
Designated SSO: NA
LERF Operator:
Operators :
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
APPROVED Flow checks on ZA, XP and YB dipoles
COMMENT ON Examine IBCAD00C cavity (SAM 2025-2026)
Survey and Alignment work summary
CIS Work Summary 11/19/2025
ACG Report 11/19/25
FSD control updates in E3 & 2L03 complete
C75-05 Acceptance Testing
COMPLETED Remove Chopper Relay Chassis To Adjust Its Heater Relays
The 4-20 mA signal conditioning boards attached to each of the heater relays Have been removed. The control wires are now directly wired to the heater SSRs. New relays were available and installed in place of the old relays. the Chassis was reinstalled and its operation was validated.
FML SAD Update - 11/19
COMMENT ON Startup of Two Additional Central Chilled Water System Chillers and Associated Primary and Secondary Pumps and Final Commissioning
The initial refrigerant charge was added to Chiller 60-CH-4 today. The charge will be topped off Friday during the factory startup process. The initial refrigerant charge will be added to Chiller 60-CH-3 tomorrow in preparation for Friday factory startup. Controls point to point checks continued.
ATLis Comments Daily Digest
COMMENT ON PSS Video System Upgrade
COMMENT ON Miscellaneous RF SAM work
Disconnected klystron and pulled back to reveal bad o-ring seal with metal fragments embedded. Snooped without Marmond clamp and leaked all around. Cleaned out channel and put new o-ring in and resealed and tested. Held 1.5 PSI for over an hour and then developed a very slow leak again. Found a regulator plug and the source regulator leaking pretty good at higher pressures. Had trouble getting line out off upper source regulator with fluorescent light fixture directly in front of the regulator line. Will need higher ladder and long reach to replace and tube tomorrow and retest.
Hall C pressure switches replaced
I&C requested that MSS turn on helium supply to Hall C. Purpose to verify the helium exhaust system functionality after pressure switches replaced. System check out checked good. Upon completion requested MSS turn off helium supply to Hall C.










