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Injector Setup As Found
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FSD Masking Tool: Successful System Masking for: BeamLossMonitor
FSD Masking Tool: Successful Destination masking to: Injector
Field Emission Onset Measurements in 1L25
Cav 1: Onset @ 9.5 MV/m, 10 Rem/Hr @ 13.5 MV/m
Cav 2: Onset @ 8.5 MV/m, 10 Rem/Hr @ 12.5 MV/m
Cav 3: Onset @ 9.5 MV/m, 10 Rem/Hr @ 15 MV/m
Cav 4: Onset @ 12.0 MV/m, 10 Rem/Hr @ 17.5 MV/m
Cav 5: Onset @ 7.7 MV/m, 10 Rem/Hr @ 11 MV/m
Cav 6: Onset @ 9.2 MV/m, Quench @ 13.7 MV/m
Cav 7: Onset @ 12.0 MV/m, 10 Rem/Hr @ 18.5 MV/m
Cav 8: Onset @ 10.7 MV/m, 10 Rem/Hr @ 17 MV/m
2L03 Commissioning Swing Shift
1st shift testing this cryomodule.
Brought all cavities up to ~ 4 MV/m without problems
Tested interlocks - Arc, Cold Window, BLVac and WGVac- all good
Checked tuners on Cavities 3 and 4
Cavity 3 tunes down to 1497.013 MHz but no further.
Cavity 4 tunes down to 1497.001 MHz but no further
Both cavities tuned freely after reversing direction
No faults or limit switch activation noted
Field Emission Onset Measurements in 1L05
Cav 1: Onset @ 13 MV/m, quenching above 13.5 w/ steadily increasing WG vacuum
Cav 2: Onset @ 9.7 MV/m, quenching above 14.7
Cav 3: Bypassed
Cav 4: Onset @ 14.5 MV/m, admin/quench limited at 21. The upstream beamline decarad jumped up partway through the ramp (at about 19.5) so I may revisit this one later.
Cav 5: Onset @ 11 MV/m, quenching at 13.2
Cav 6: FE free up to 15.4 MV/m, where cavity quenches in SEL. Was initially quenching at 12.1 w/ no field emission so I pulse processed up to 15.6 where (fig. 5) we were getting frontend saturation.
Cav 7: Bypassed
Cav 8: Bypassed
ATLis Comments Daily Digest
Follow-up Re: Differences between UVA RTP HV Driver and JLab RTP HV Driver
1- The first difference is not a problem. Ultimately, MOLLER compares the definition of helicity to the polarimeters in the Hall (Moller and Compton) to find the real helicity of the electron beam.
2- The second difference is a result of mis-labeling and this was fixed. Actually, there is no difference here.
COMMENT ON Removal and Installation of Girders 2L25A & 2L26A
COMPLETED EVL001 LOTO Evaluation 1L21
ACG Report 02/18/2026
ReCap Documentation and Training Presentation
1L06 EPICS Helium Flow Meter Controls
PT0L02 Degrader Comm Alarm Active
CED updates for 2L03/2L25
COMMENT ON Implement a Gamma IP controller for CEBAF gun anode biasing and current monitoring, following the method used in UITF
COMMENT ON Implement a Gamma IP controller for CEBAF gun anode biasing and current monitoring, following the method used in UITF
Checked Labeling of Cables of UVA RTP HV Driver - RTP 2 was mislabeled
Checked the labeling of RTP 2 crystal HV cables. It turned out that we mislabeled cable 3 and cable 4 during our work in November 2024 - see Figures 1 and 2. The original and correct label is on the black plastic cap. The white label was put in when we cut the cables to add the WAGO connectors.
The labeling was corrected. This explains why when we installed the new Driver we had to swap cables - see linked entry. So at the end, there is no difference in the cabling of the two drivers, just we mislabeled the cables on the old driver.
COMMENT ON RF work for 2026 HCO
PSS Cert completed for 2L04, 2L12, 2L18 and 2L25 after repairs completed this week to get them into HV. 2L25-7 developed a ModAnode Volt High Fault after HV dropped out and back on several times for cert and won't go back into HV until new ModAnode board installed most likely. 2L04-2 RFCM locked up and had to have a RD1 installed to get into HV for cert (been up all week until minutes before cert. !!!) 2L08-8 had the RFCM replaced for a HV enable fault and it was checked out in HV also today.










