Aggregator

Log Number: 4474704Logbook(s): 

• POLOG
• ELOG

Entry Makers: chgarciaBody: 

Notice how the gun vacuum was recovering after the HV trip off, then at 16:29:03 the gin IP current increases, instead of continuing to drop. Then it stabilizes and decrease again very, very slowly (Fig. 2. ).
Fig. 3. shows the voltage at that time was 5 kV.

No evidence of HVPS curren precursor, Fig. 4. Gun was delivering 60 uA for beam ops before the HV tripped off.

There is no indication of precursor field emission from the anode current either, Fig. 5. Nor from DecaRads (Fig. 6). The signal shown by DecaRads is from beam.

Log Number: 4474703Logbook(s): 

• POLOG
• ELOG

Entry Makers: mockBody: 

.

Log Number: 4474702Logbook(s): 

• ELOG

Entry Makers: mockBody: 

Have a major alarm for iocsl25rffcc7 MEMBLOCK.

Looks like FCC 6 and FCC 2 also have low memory but only in minor alarm currently.

Log Number: 4474699Logbook(s): 

• POLOG
• ELOG

Entry Makers: beneschBody: 

not good

Log Number: 4474698Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: High Voltage was turned off for:
R02
R03
R04

Log Number: 4474697Logbook(s): 

• ELOG
• LERFLOG

Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 03-06-26
Time : 07:11:18
Day : Friday
Shift : Day

Crew Chief : Mock
Program Deputy: Schoene
Team : B
Arm : Barker
Designated SSO: Janak
Operators : Barker, Janak

This stamp certifies that the above Crew Chief has read/reviewed/received the following:

Log Number: 4474695Logbook(s): 

• ELOG

Body: ACC=>IOCS=>SOUTH_LINAC=>iocsl4=>camac=>iocsl4:noXrate has been disabled in alarm handler

Intermittent alarm. Ops-PR'd: https://logbooks.jlab.org/entry/4474694

Log Number: 4474694Logbook(s): 

• ELOG

Entry Makers: deirBody: 

2L15-5

Intermittent. Was Ops-PR'd end of last run as well...attached as a reference.

Log Number: 4474693Logbook(s): 

• POLOG
• ELOG

Body: 

- Measured lasers A and D circular polarization.
- Measured laser A polarization versus RTP Pockels Cell HV.
- Gun tripped with large vacuum spike - will investigate today.

Log Number: 4474692Logbook(s): 

• ELOG

Body: ACC=>VACUUM=>EAST_ARC=>ARC1=>VIP1A26 has been disabled in alarm handler

Alarming while disabled. Noisy readback. https://logbooks.jlab.org/entry/4440526

Log Number: 4474691Logbook(s): 

• ELOG

Body: ACC=>VACUUM=>EAST_ARC=>ARC1=>VIP1A26 has been enabled in alarm handler

ENA

Log Number: 4474690Logbook(s): 

• SRFPLASMA
• ELOG

Entry Makers: jhowardBody: 

Log Number: 4474689Logbook(s): 

• SRFPLASMA
• ELOG

Entry Makers: deirBody: 

Background for the Return Beamline head is > 10 mRad/hr. This is with RF Off in zones 1L12->1L26.

Cav 6: Pushed until another DecaRad head was ~10k. Return beamline gets very high very quickly. Started FE Onset at 19.2 MV/m.

Cav 7: Similar to Cav 6. Pushed until a second DecaRad head was ~10k. Started FE Onset at 16.8 MV/m. Did a second measurement with the GLOS Step Size reduced to 0.02.

Cav 8: Similiar to the other two cavities. Pushed until another DecaRad head was ~10k. Started FE Onset at 15.2 MV/m.

Log Number: 4474688Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Cav 1: KRRP limited at about 15.5 MV/m. Pretty unsteady decarad readings. Perhaps a contender for pulse processing.
Cav 2: Quench limited at 10.5 MV/m. Masked quench and tried to push higher, still limited to 10.5 MV/m.
Cav 3: Quenching above 8.8 MV/m.
Cav 4: Quenching at 21.5 MV/m with or without mask enabled.
Cav 5: Quench limited at 20.5 MV/m with or without mask enabled. Started measurements at 20.3 MV/m.
Cav 6: Quench limited at about 16.8 MV/m with or without mask enabled. started measurements a tad bit lower.
Cav 7: Quench limited at 19.2 MV/m with or without mask enabled.

Log Number: 4474687Logbook(s): 

• MOLLER
• ELOG

Tags: 

• Moller
• PD

Entry Makers: jonesgaskelldwinesdougkashyberdnikciprianBody: 

Hall techs continued progress on blue utility platform. Hall techs moved Drift pipe base from test lab to hall. Electricians started process of electrically connecting JIB crane.

Log Number: 4474686Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-03-06 02:48:27 The output from the myRestore execution was as follows: iocnl26rffcc1 Rf12Fcc_V2 Pause: 60 second(s) Execute: /cs/opshome/burt/REBOOT/Rf12Fcc/DLOAD_ICAL.csh iocnl26rffcc1 (success) c100_rffcc@2026-03-06 02:48 72(72) restored c100_ecal@2026-03-06 02:48 19(19) restored Execute: myRestore -execute -P c100_ecal -t R1Q1_ECAL -m BLDGNUM=1 ZONE=Q CAV=1 (success) c100_ecal@2025-01-18 09:02 19(19) restored Execute: burtwb -r 3 -f /cs/opshome/burt/REBOOT/Rf12Fcc/snap-kc/

Log Number: 4474685Logbook(s): 

• ELOG
• RFLOG

Entry Makers: jhowardBody: 

We seem to have lost connection to 1L26-1 FCC. At the FCC the heartbeat looks fine, so it may be a software thing. iocin2 also looks fine, which we are directed to look at. Combo screen looks fine, but expert screen is showing something is not communicating. Not sure if this is a Software or RF fix.

OPs-PRing for now, and we will leave the cavity off when we recover the zone from FE measurements

Log Number: 4474684Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Deir
DATE:             03/06/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4474683Logbook(s): 

• SRFPLASMA
• ELOG

Entry Makers: jhowardBody: 

Log Number: 4474682Logbook(s): 

• ELOG
• RFLOG

Entry Makers: jhowardBody: 

It is not throwing up any faults that would prevent it from going into HV, but we have not had a chance to look in the service building. We will update when we do.