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SL MO LO PLDER GLDER Issue Update
COMMENT ON RF Maintenance June 30th, 2026
LEM North Linac
Downtime Incident CREATED: EESRF recovering 1L04-3
The OPS DRVHs for the following cavities have been updated: 1L04-4
The OPS DRVHs for the following cavities have been updated:
1L04-4
Username: kerns
Date/Time: 07-02-26_15:15:38
RF Status: Good
Tuner Status: Good
Comment: DRVH=9.000 Drive getting weak at 11.0 Mv/m, GASK at~4v with 0.0 RATN.
Previous OPS DRVH: 11
Special Instructions:
The following cavity histories have been updated: 1L04-8
The following cavity histories have been updated:
1L04-8
Username: kerns
Date/Time: 07-02-26_15:11:38
RF Status: Good
Tuner Status: Good
Comment: Cavity 8 recovered from tuner issues after tuner checks and RFCM replacement. ODVH= 10.3
Special Instructions: Leave tuner in manual
Maintenance Tag: Component: Other
The following cavity histories have been updated: 1L04-3
The following cavity histories have been updated:
1L04-3
Username: kerns
Date/Time: 07-02-26_15:10:18
RF Status: Good
Tuner Status: Bad
Comment: Dang. Cavity 3 not recovered, no gradient in OLT. Needs RFCM like cav. 8.
Special Instructions:
Maintenance Tag: Component: Other
The following cavity histories have been updated: 1L04-8
The following cavity histories have been updated:
1L04-8
Username: kerns
Date/Time: 07-02-26_15:08:46
RF Status: Good
Tuner Status: Bad
Comment: Cavity 8 recovered. Cavity 3 still has problem with no gradient found in OLT. Needs RFCM like 8.
Special Instructions: Leave tuner in manual
Maintenance Tag: Component: Other
The following cavity histories have been updated: 1L04-8
The following cavity histories have been updated:
1L04-8
Username: kerns
Date/Time: 07-02-26_15:06:03
RF Status: Good
Tuner Status: Good
Comment: Cavity recovered after tuning problems solved. ODVH=10.3 Mv/m and optimized.
Special Instructions: Leave tuner in manual
Maintenance Tag: Component: Other
The following cavity histories have been updated: 1L04-3
The following cavity histories have been updated:
1L04-3
Username: kerns
Date/Time: 07-02-26_15:06:03
RF Status: Good
Tuner Status: Good
Comment: Cavity recovered after tuning problems solved. ODVH=10.3 Mv/m and optimized.
Special Instructions:
Maintenance Tag: Component: Other
Vacuum Group Summary 2026-07-02
Crew Chief Shift Log, 2026-07-02 DAY
Start of shift: NL taken to RA for continued YBBS06 work.
Crew Chief Timesheet Summary: 02 Jul 2026 DAY
1L15-2 DC Overload Moments after HV
Had correct KCCU and a reasonable KMAI at ~.8 ma with no KMAS voltage. Ran for a couple of minutes and the CPS dropped on DC Overload. Locked zone back up and found cavity 2 kly. resistor shattered again and also noted ModAnode extreme heat smell. Cavity 2 ModAnode resistor is white corona painted and looks good but cavity 1 resistor is almost burned in half. We will need to check the modanode resistor before plugging cav2 resistor back in.










