Aggregator

Log Number: 4529173Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17491Title:
2L05 Dropped HV

Summary:
Can't recover HV through zone screen.

Log Number: 4529165Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
1L22-6
Username: michaelm
Date/Time: 07-22-26_09:45:55
RF Status: Good
Tuner Status: Good
Comment: Cavity derate 15 > 13 for KRRP faults under load
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4529164Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L22-6
Username: chumphry
Date/Time: 07-22-26_09:44:30
RF Status: Good
Tuner Status: Good
Comment: DRVH=13.000 DRVH:13.00 Frequent trips at high current
Previous OPS DRVH: 14.5
Special Instructions:

Log Number: 4529163Logbook(s): 

• ELOG

Entry Makers: janakBody: 

Log Number: 4529158Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: michaelmBody: 

15 MV/m > 13 MV/m so far. History also shows some issues at 15 MV/m with KRRP faults under load. Circulator load replacement required? CRFP appears very reasonable for this current / gradient. (70 uA to Hall C 4th pass)

Log Number: 4529154Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4529146Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4529136Logbook(s): 

• ELOG

Entry Makers: janakBody: 

Attempted POFF optimization after several consecutive trips on this cavity. The optimization only changed POFF by 2 degrees and had not effect on trip rate.
Next step was to derate by 0.5 MV/m.
This seems to have helped, currently running at 65uA with no recent trips on this cavity
Updated ODVH

Log Number: 4529134Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L22-6
Username: janak
Date/Time: 07-22-26_09:20:54
RF Status: Good
Tuner Status: Good
Comment: DRVH=14.500 Frequent trips at high current at 15MV/m
Previous OPS DRVH: 15
Special Instructions:

Log Number: 4529131Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Log Number: 4529129Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Log Number: 4529127Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Recommend open loop tuning the cavity - probably zeroed off resonance

Log Number: 4529125Logbook(s): 

• ELOG

Entry Makers: janakBody: 

BPM is showing HI Y saturation, and IF gain delta

Log Number: 4529123Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

1L04-5 2.1
2L02-2 1.71
2L07-4 -.73
2L17-5 4.23
2L18-3 -5

Log Number: 4529120Logbook(s): 

• ELOG

Entry Makers: michaelmBody: 

Log Number: 4529114Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

Log Number: 4529107Logbook(s): 

• ELOG

Tags: 

• MCC8am

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Beam off.

Log Number: 4529106Logbook(s): 

• ELOG

Entry Makers: chumphryBody: 

All is Well

Log Number: 4529103Logbook(s): 

• ELOG

Entry Makers: janakBody: 

20 degree shift

Log Number: 4529099Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Humphry
DATE:             07/22/2026
SHIFT:               Day

The operator has read the following:

• ELOG
• PD Shift Plan
• Radiation Surveys for PSS Segments in Controlled Access
• PSS Log