Aggregator
0L04 module is dry, insulating vacuum climbing
Contacted SRF re: loss of 0L04 insulating vacuum
NLinac autopumpdown start
Injector vacuum started going downhill around VIP0L01
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 08-14-26
Time : 15:28:08
Day : Friday
Shift : Swing
Crew Chief : Forman
Program Deputy: Park
Team : X
Arm : Anthony
Designated SSO: Shriner
LERF Operator:
Operators : Anthony, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
[Late Entry] Large NL GP shift during Thunderstorm
Noticed a lot of oscillation in the 1A SLM during the thunderstorm @~1320. Spent some time looking for bad actors but then noticed the beam spot looked quite different as well so I tried adjusting NL gang phase. Found it had shifted 4 degrees.
Crew Chief Shift Log, 2026-08-14 DAY
Start of shift: CW beam to B/C/D
Crew Chief Timesheet Summary: 14 Aug 2026 DAY
HYST AREA 7-0 Cycles Magnets for LEM
LEM South Linac
The following cavities have been UnGSET 0: 2L11-7
The following cavities have been UnGSET 0:
2L11-7
Username: alexs
Date/Time: 08-14-26_15:02:31
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Recovered to drive high after klystron arc
Special Instructions:
Maintenance Tag: Component: Other, Component: Operator Entry - See SME
Preemptive 2-hour escalation notifications made regarding NL 2K cold box trip
2K Cold Box Trip Bring Down NL RF
CHL2 2K trip during thunderstorm
Downtime Incident CREATED: 2K Cold Box Trip Takes Down N.Linac RF
IICAD00B reporting non-physical spikes during lightning storm
When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.
IIC3P03 reporting non-physical spikes during lightning storm
When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.
IIC3H04 reporting non-physical spikes during lightning storm
When lightning activity significantly increased during the thunderstorm this afternoon, we started getting trips on this ion chamber. Initially it was chalked up to magnet and RF instability from the heavy rain and lightning, but then it was noticed that these spikes are also occurring with the beam off. It appears some flaw in the electrical system may be setting them off rather than the beam.
LERF Operator Shift Log, 2026-08-14 DAY
Start of shift: LERF to Power Permit.










