Recent Log Entries
COMPLETED Hall B Cold Cathode Cable Replacement (2023 SAD)
Fopt - After Cycling 2,3A
Log Number: 4175589Logbook(s): Tags: Body: Fopt 7.7 completed successfully. The runtime settings include a sample count of 15, a minimum current of 4, and an operating regime of Standard with Excitation in 1S Region. The corrector and RF kicks applied were 1.48165 and 1.48165 volts respectively. The max. amplitude setting was 1 millimeters. The files for this run were saved in the directory /cs/opshome/hlapps/optics/diforb/23sep070723. The X and Y stability of the machine during the run was 0.123491 and 0.0540901 (mm) respectively.
1L18 HPA update
Log Number: 4175586Logbook(s): Entry Makers: lfarrishBody:
Good Morning
1L18 HPA had repair work done yesterday Sam found a broken wire (current sense resistor) in the HPA late afternoon. I repaired that connection also replaced the ground cable to the ground stick Sam will inspect that this morning. Resistor for Klystron 3 looked bad but it measured 49.8 ohms all good. They will continue work on this zone this morning.
COMMENT ON YA PM's
Log Number: 4175579Logbook(s): Body:
Update from yesterday (6-Sept): https://logbooks.jlab.org/entry/4175379
2L21 - Cav 1 causing GMES Fault in Cav 4
Log Number: 4175578Logbook(s): Entry Makers: deirBody:
Zone dropped out of HV on Cavity 4 GMES fault, as it has many time over the past days.
However, when I was trying to recover the zone this time, something very weird happened.
All of the cavities were off, zone was put back into HV, and I started to turn the cavities on one-by-one.
Turning on Cav 1 introduced some GMES into Cav 4, dropping the zone out of HV.
Fig 3: Can see a GMES response in Cav 4 when Cav 1 is turned on. R2L4CRFP is reading zero (I think the readback for this may be a bit funky) as well as R2L4GASK.
Crew Chief Shift Log, 2023-09-07 OWL
Log Number: 4175577Logbook(s): Tags: Body:
CEBAF SHIFT LOG
Shift Summary
Start of shift: Continuation of ORFP, measuring V-dispersion out of 3
2L18 diode curves
COMMENT ON 1L18 CPS current sense fault
QuickPic - 1L17 dropped out of filaments on cav 4 fil volts high
Crew Chief Timesheet Summary: 07 Sep 2023 OWL
Log Number: 4175573Logbook(s): Tags: Body:
Accelerator
PHYSICS
STUDIES
RESTORE
ACC
DOWN
OFF (SAD)
Planned
0
0
8
Fopt 23sep070640 results: After correcting H. Disp out of 4A
Fopt - After 4A Dispersion Correction
Log Number: 4175567Logbook(s): Tags: Body: Fopt 7.7 completed successfully. The runtime settings include a sample count of 15, a minimum current of 4, and an operating regime of Standard with Excitation in 1S Region. The corrector and RF kicks applied were 1.48165 and 1.48165 volts respectively. The max. amplitude setting was 1 millimeters. The files for this run were saved in the directory /cs/opshome/hlapps/optics/diforb/23sep070640. The X and Y stability of the machine during the run was 0.0601271 and 0.0397216 (mm) respectively.
Fopt failure
Fopt
Log Number: 4175565Logbook(s): Tags: Body: Fopt 7.7 completed successfully. The runtime settings include a sample count of 15, a minimum current of 4, and an operating regime of Standard with Excitation in 1S Region. The corrector and RF kicks applied were 1.48165 and 1.48165 volts respectively. The max. amplitude setting was 1 millimeters. The files for this run were saved in the directory /cs/opshome/hlapps/optics/diforb/23sep070636. The X and Y stability of the machine during the run was 0.0467024 and 0.0389258 (mm) respectively.
