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QuickPic - Handphased 1L21, running Phaser
CIS Work Summary 03/13/2026
Operator SIGN IN
QuickPic - Set 2L13 LEM req heat to 20W
Operator SIGN IN
H. Dispersion 1A and 2L
Autolog save
30 Hz Generator Issues
The dispersion pattern is breathing quite significantly and is basically unusable. I've tried to capture how much the 30 Hz bpms differ in the two attached images below. We attempted lowering the GSETs of the 1L21 cavities to make sure that RF stability isn't the issue and it did not help. Maybe another timing issue?
FudgeIt
iocsoftw3spce restored
LEM North Linac
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 03-15-26
Time : 15:20:37
Day : Sunday
Shift : Swing
Crew Chief : Forman
Program Deputy: Roblin
Team : F
Arm : Yoon
Designated SSO: Schaumloffel
LERF Operator:
Operators : Schaumloffel, Yoon
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
LEM North Linac
FudgeIt
LEM North Linac
The OPS DRVHs for the following cavities have been updated: 1L21-4
The OPS DRVHs for the following cavities have been updated:
1L21-4
Username: janak
Date/Time: 03-15-26_15:25:53
RF Status: Good
Tuner Status: Good
Comment: DRVH=4.000 ODVH changed due to Special Instructions/Program Requirements
Previous OPS DRVH: 8.9
Special Instructions:
The OPS DRVHs for the following cavities have been updated: 1L21-3
The OPS DRVHs for the following cavities have been updated:
1L21-3
Username: janak
Date/Time: 03-15-26_15:25:32
RF Status: Good
Tuner Status: Good
Comment: DRVH=4.000 ODVH changed due to Special Instructions/Program Requirements
Previous OPS DRVH: 8.8
Special Instructions:
The OPS DRVHs for the following cavities have been updated: 1L21-2
The OPS DRVHs for the following cavities have been updated:
1L21-2
Username: janak
Date/Time: 03-15-26_15:25:08
RF Status: Good
Tuner Status: Good
Comment: DRVH=4.000 ODVH changed due to Special Instructions/Program Requirements
Previous OPS DRVH: 6.4
Special Instructions:










