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CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 04-16-26
Time : 07:27:42
Day : Thursday
Shift : Day
Crew Chief : Blackshaw
Program Deputy: Ogur
Team : E
Arm : Humphry
Designated SSO: Janak
LERF Operator:
Operators : Humphry, Janak
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
Crew Chief Shift Log, 2026-04-16 OWL
Start of shift: 6 uA to Hall C. BSY2C tripped, DC power troubleshooting.
Crew Chief Timesheet Summary: 16 Apr 2026 OWL
LO disturbances? or maybe just the weather...
I've been snooping around for about an hour now
... Trying to investigate the South Linac LO after it brought south RF down
Figure 3:
Seems that, perhaps, chasing LO disturbances is really just chasing the weather
Perhaps better insulating would help?
RF Health Check - Quick Check after unexpected disturbance in BPM's
Comment: Quick Check after unexpected disturbance in BPM's
Beam Conditions:
Total Linac Current (R2XXITOT) = 11.94
Hall A Current (IBC1H04CRCUR2) = 0
Hall B Current (IPM2C24A.IENG) = 2.75544
Hall C Current (IBC3H00CRCUR4) = 5.94
Hall D Current (IBCAD00CRCUR6) = 0
BSY Current (IBC4C00CRCUR5) = 0
INJ Energy (MMSINJEGAIN) = 38.9312
NL Energy (MMSLIN1EGAIN) = 345
SL Energy (MMSLIN2EGAIN) = 345
Gradient Problems:
0L02-7 Klystron Cathode Current (KCCU)=0.00402832 (<=0.7A)
0L03-1 Local Oscillator Power (LOPW)=54 (<=70mW)
1L04-8 GLDER=213 (>=200) with RF OFF - Check Detuning
1L06-1 GLDER=430 (>=200)
MDB1L27H voltage irregularity
The trim card for this magnet was swapped along with many others as a part of general optics troubleshooting on April 9th, ATLis 119983. Seems like after the swap, voltage got a little weird. It's not affecting current though, but I think a reseat or another swap might be a decent idea. All readbacks before the swap on the 9th were stable.










