Channels: R195TDISC, R195GLOS
1L09-5 was recovered today by the RF team. In bringing back this cavity to reference we noticed that there was some bad backlash.
We leveraged Tom's idea of moving the motrs back and forth by a few kHz until the backlash seems to get better.
This helped the backlash get better but it is still present.
The following cavity histories have been updated:
1L13-7
Username: kerns
Date/Time: 06-25-25_14:30:12
RF Status: Good
Tuner Status: Good
Comment: Recovered and optimized RF to ODVH=10.9 Mv/m after 50 ohm resistor replaced.
Special Instructions:
Maintenance Tag: Component: 50 Ohm Resistor
Check magnet output connections in connector of magnet output cable, and inside the supply itself for the following SCE's:
MQP5C10- Found loose connections in both locations. Tightened and will continue to monitor current/voltage readback until later today. Leaving PTW-7785 open for now.
MQR2C08- Found nothing loose. Will check magnet connections inside the tunnel at next opportunity.
MQKAR06- Found loose connections inside the supply.
The following cavity histories have been updated:
2L12-4
Username: holben
Date/Time: 06-25-25_14:19:15
RF Status: Bad
Tuner Status: Good
Comment: Klystron shorted. Hi-pot fails <500 Vdc @ 4.5 ma. Varian SN 272 Needs to be replaced.
Special Instructions:
Maintenance Tag: Component: Other
The following cavity histories have been updated:
Zone 1L18
Username: kerns
Date/Time: 06-25-25_13:55:38
RF Status: Good
Comment: Recovered RF in cavities 4,6,7 and 8 after it was opened today.
Special Instructions:
Maintenance Tag: Component: Other
"Blue Pig" ion pump power supply swapped out with Gamma SPCe.
SPCe ready for network support to run ethernet cable to connect to OPSSL17SW1.
Software can complete work on the control screen once the supply is connected.
Performed local test of installation. Ion pump would not start. Supply would not get above 50V then times out. This matches the behavior of this pump when on the old "blue pig" supply. Suspect issue with cable, pump, or vacuum downstairs. Will investigate issue next maintenance day with tunnel access.
The following cavity histories have been updated:
1L08-8
Username: kerns
Date/Time: 06-25-25_13:08:05
RF Status: Bad
Tuner Status: Good
Comment: Bypassed and stepped off +100 k for bad arc detector failing arc detector tests.
Special Instructions:
Maintenance Tag: Component: Arc Detector
In reference to: https://logbooks.jlab.org/entry/4405372
The 5th pass horizontal separator will require re-phasing due to the soft IOC was rebooted and the POFF for each cavity was changed.
The following cavity histories have been updated:
1L08-8
Username: kerns
Date/Time: 06-25-25_13:03:35
RF Status: Bad
Tuner Status: Good
Comment: RFCM replaced and arc detector card replaced, Both tests still fail meaning bad arc det. PMT on cavity. Bypassed and stepped off +100k
Special Instructions:
Maintenance Tag: Component: Arc Detector
The following cavity histories have been updated:
1L02-7
Username: kerns
Date/Time: 06-25-25_12:56:55
RF Status: Good
Tuner Status: Good
Comment: Replaced RFCM and probe cable. Restored and optimized RF at ODVH= 8.0 Mv/m.
Special Instructions:
Maintenance Tag: Component: RFCM {Removed SN: 136, Replacement SN: 215}
| Shift | Day |
|---|---|
| CEBAF Program | Physics!! |
| MCC Crew Chief | Schoene |
| MCC Operators | Humphry, Barker, Samari |
| Program Deputy | Nissen |
| Announcements |
