Aggregator
FSD Masking Tool: Successful System UN-Masking for: BeamLossMonitor
FSD Masking Tool: Successful System Masking for: BeamLossMonitor
2L15-3,4 derated due to SOSing
Log Number: 4472682Logbook(s): Entry Makers: victorcBody:
Noticed cavity 3 SOSing first. Tried OLT. Kept SOSing over 4 MV/m (ODVH = 5.5 MV/m). Noticed much more negative GLOD than usual for ~0.40 kW CRFP. CRFP also seemed pretty unstable.
While OLTing cavity 3, cavity 4 starting SOSing. OLT'd cavity 4 but it would SOS again over ~7.5 MV/m (ODVH 12.7 MV/m).
Left cavity 4 at 7 MV/m and cavity 3 at 4 MV/m. Pair is stable for now there.
1L05-7 in SELA mode is odd
MOLLER Install Update 02/23/2026
Log Number: 4472680Logbook(s): Tags: Entry Makers: jonesgaskelldwinesdougberdnikciprianBody:
Hall A techs started process of removing cable trays, LCW piping and Unistrut braces, from blue utility platform. Hall A tech set and epoxied 16 anchors for pion donut. Also reinstalled dump fencing access door fencing section.
ATLis Comments Daily Digest
Log Number: 4472679Logbook(s): Tags: Body:
*/
ATLis Comments Posted 18:00 Sunday February 22 through 18:00 Monday February 23
AES DC power Systems
Hi-Pot ARC 7 Magnet YBBS04 in the Accelerator Tunnel
2026-02-23 12:02 - Kevin O'Brien
The OPS DRVHs for the following cavities have been updated: 1L05-7
Log Number: 4472678Logbook(s): Tags: Body:
The OPS DRVHs for the following cavities have been updated:
1L05-7
Username: lrichard
Date/Time: 02-23-26_17:41:00
RF Status: Good
Tuner Status: Good
Comment: DRVH=12.400 ODVH changed due to Special Instructions/Program Requirements
Previous OPS DRVH: 12.4
Special Instructions:
The OPS DRVHs for the following cavities have been updated: 1L05-7
COMMENT ON RF work for 2026 HCO
Log Number: 4472676Logbook(s): Body:
2L08-8 RF repair and restore, broken cable/connector GMES. 2L08-3 developed Filament Volt High Fault getting back into filaments. 2L09-6 still has 0.0V CWWT voltage after IR cards swapped, needs SRF check IR voltage out of cryo-module. 2L14-6 has no CRFP but good CRRP, needs RFCM replaced, 2L16-6 TDETA unstable due to incorrect CRFP/CRRP readbacks and phase loop not locking, needs RFCM replaced. 2L19-6 has no CRFP/CRRP readbacks and needs RFCM replaced. 2L21-6 had KMAI faults due to filaments at 6.9 V and KMAV of 2kV, KCCU at .9 A.
ACG Report 02/23/2026
Log Number: 4472674Logbook(s): Tags: Body:
Progress on new SME Alarm Notification System
HLAPP fsd_monitor Support
FSD Masking Tool: Successful System UN-Masking for: BeamLossMonitor
FSD Masking Tool: Successful System Masking for: BeamLossMonitor
The following cavity histories have been updated: 2L09-6
Log Number: 4472671Logbook(s): Tags: Body:
The following cavity histories have been updated:
2L09-6
Username: kerns
Date/Time: 02-23-26_17:06:23
RF Status: Bad
Tuner Status: Good
Comment: IR cards swapped and still 0.0 V CWWT. Next, need SRF to check IR/cable at cryo-module.
Special Instructions:
Maintenance Tag: Component: Other
The following cavity histories have been updated: 2L16-6
Log Number: 4472670Logbook(s): Tags: Body:
The following cavity histories have been updated:
2L16-6
Username: kerns
Date/Time: 02-23-26_17:03:05
RF Status: Bad
Tuner Status: Good
Comment: Bad CRFP/CRRP readbacks making phase loop/tdeta unstable. Needs RFCM replaced.
Special Instructions:
Maintenance Tag: Component: RFCM
The following cavity histories have been updated: 2L21-6
Log Number: 4472669Logbook(s): Tags: Body:
The following cavity histories have been updated:
2L21-6
Username: kerns
Date/Time: 02-23-26_17:00:24
RF Status: Bad
Tuner Status: Good
Comment: Tube recovered correctly and needs to run overnight to check output.
Special Instructions:
Maintenance Tag: Component: Tube
2L21-6 KMAI over 3.5mA
Log Number: 4472668Logbook(s): Entry Makers: kernsBody:
Found the KMAI at over 3.5mA, KCCU at .9a with KFVM set at 6.9v with 2kV KMAV. Set filaments back down to 6.2v with 0.0 KMAV and tube is recovering to a KCCU of .79A with 1.668mA KMAV. Will need to leave run here over night to see if the tube KCCU get better that .79 A.
The following cavity histories have been updated: 2L19-6
Log Number: 4472663Logbook(s): Tags: Body:
The following cavity histories have been updated:
2L19-6
Username: kerns
Date/Time: 02-23-26_16:36:21
RF Status: Bad
Tuner Status: Good
Comment: Measured power at RFCM CRFP/CRRP ports. Needs RFCM replaced to correct.
Special Instructions:
Maintenance Tag: Component: RFCM
1L13 dropped HV
The following cavity histories have been updated: 2L14-6
Log Number: 4472660Logbook(s): Tags: Body:
The following cavity histories have been updated:
2L14-6
Username: kerns
Date/Time: 02-23-26_16:15:26
RF Status: Bad
Tuner Status: Good
Comment: Tested RFCM CRFP port and found no readback with 5dbm inputed. Needs RFCM replaced.
Special Instructions:
Maintenance Tag: Component: RFCM
Shift Information
| Shift | Day |
|---|---|
| CEBAF Program | |
| MCC Crew Chief | Humphry |
| MCC Operators | Thomas |
| Program Deputy | Buttles |
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