Aggregator
Operator SIGN IN
The following cavity histories have been updated: Zone 2L08
The following cavity histories have been updated:
Zone 2L08
Username: geesaman
Date/Time: 02-27-26_07:56:09
RF Status: Good
Comment: The door for SL08B18 was not fully shut. It is now closed and the interlocks clear.
Special Instructions: fault cleared by resetting CPS control panel switches (cycle one on left, then three on right, then fault reset)
Maintenance Tag: HPA Door SL08B18
FSD Masking Tool: Successful Destination masking to: Inj500KeV
Autolog restore
Autolog save
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-27-26
Time : 07:09:27
Day : Friday
Shift : Day
Crew Chief : Humphry
Program Deputy: Schoene
Team : X
Arm : RadCon
Designated SSO: Thomas
LERF Operator:
Operators : Barker, Thomas
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
RF On/Off turned HV Off
RF On/Off turned HV Off
CIS Work Summary 02/26/2026
QE Measurement
1L21-5 OLT
Hall C: OM03 briefly alarmed
1L21-5 reduced gradient
COMMENT ON Post SAM FE onset measurements C75 and C100 cryomodules
New measurements by request for 1L05-{2, 5, 7} https://logbooks.jlab.org/entry/4473293
and 1L10-{1, 5} https://logbooks.jlab.org/entry/4473297
1L10-{1, 5} FE onset
1L05-{2, 5, 7} FE onset measurements
Cavity 2: Took one set of measurements with background that was too high, so killed that file and fixed the background situation with linac quads. Let vacuum settle for a long time before taking second run, as Decarads quieted along with recovering vacuum. Started at ~14.3 MV/m; Decarad 9 at ~8700.
2L13 cavities found off target gsets
Found cavities 3 and 4 sitting below their target gsets and cavity 5 sitting a little high. Nothing was in the logbook about 3 and 4, cavity 5 was OLT's on swing and brough back a little high. I walked everything back to their target gsets.
Operator SIGN IN
Injector Work Summary
Starting by loading up the updated setup_345 design values. After a while of trying to figure out a solution to the problem of much more emittance in both X and Y than expected and overall puzzling optics beyond what either Victor or I could backpropagate, Victor and I realized by varying 0L02/A quads while looking at ITV0L03 that the beam was extremely coupled. We empirically set MQS0L01 to -10 G/cm and found that it uncoupled the planes well. This is a definite mystery, as we should have no coupling and the degrader solenoid is off.










