Aggregator
iCalibrate: Hall D
2L25 zone dropped RF
"xB request 325nA"
"xB BNR for target purge"
Hall A charge asymmetry (Parity DAQ runs 18909-18917)
ATLis Comments Daily Digest
Log Number: 4408242Logbook(s): Tags: Body:
*/
ATLis Comments Posted 18:00 Saturday June 28 through 18:00 Sunday June 29
AES DC power Systems
Copy of Troubleshoot TSB5C Box Supply
2025-06-29 01:06 - James Coleman
Box sup
"xD resumes 200nA"
"xD BNR for orientation change"
Autolog save
Operator SIGN IN
Operator SIGN IN
CREW CHIEF SIGN IN
Log Number: 4408182Logbook(s): Body:
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 06-29-25
Time : 14:48:31
Day : Sunday
Shift : Swing
Crew Chief : Richardson
Program Deputy: Nissen
Team : X
Arm : Shriner
Designated SSO: Yoon
LERF Operator:
Operators : Yoon, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 06-29-25
Time : 14:48:31
Day : Sunday
Shift : Swing
Crew Chief : Richardson
Program Deputy: Nissen
Team : X
Arm : Shriner
Designated SSO: Yoon
LERF Operator:
Operators : Yoon, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
Crew Chief Shift Log, 2025-06-29 DAY
Log Number: 4408176Logbook(s): Tags: Body:
CEBAF SHIFT LOG
Shift Summary
Start of shift: Beam to xABCD.
Crew Chief Timesheet Summary: 29 Jun 2025 DAY
Log Number: 4408174Logbook(s): Tags: Body:
Accelerator
PHYSICS
STUDIES
RESTORE
ACC
DOWN
OFF (SAM)
Planned
8
0
0
1L23 FE Checks
QuickPic - Hall D radiator change to JD80-212 45/135 at 200 nA
iCalibrate: Hall D
1L23 further derated to reduce field emission
Log Number: 4408158Logbook(s): Entry Makers: alexsBody:
It was noted that the 1L23 NDX neutron rates jumped this morning, right around the time 1L23-8 quenched multiple times and had to be derated. Gradually adjusted the GSET, and sure enough the cavity had popped a field emitter. Derated it a further 1.3 MV/m to reduce neutron rates 2.8 rem/hr. Not quite back at previous levels, but at the 1 MV/m : 1 rem/hr limit.
The OPS DRVHs for the following cavities have been updated: 1L23-8
Log Number: 4408149Logbook(s): Tags: Body:
The OPS DRVHs for the following cavities have been updated:
1L23-8
Username: alexs
Date/Time: 06-29-25_14:14:00
RF Status: Good
Tuner Status: Good
Comment: DRVH=10.000 Derated 1.3 MV/m for 2.8 rem/hr neutron reduction
Previous OPS DRVH: 11.3
Special Instructions: