Aggregator

Log Number: 4488084Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Janak
DATE:             04/16/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4488068Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: bjacob 04-16-26 07:32:08 {A:i B:3 C:2 E:345 A=BS B=CW C=CW D=BS 0R08=5.94 No dumps in. Start of Day Shift.

Log Number: 4488063Logbook(s): 

• ELOG
• LERFLOG

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

Date : 04-16-26
Time : 07:27:42
Day : Thursday
Shift : Day

Crew Chief : Blackshaw
Program Deputy: Ogur
Team : E
Arm : Humphry
Designated SSO: Janak
LERF Operator:
Operators : Humphry, Janak

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

Log Number: 4488059Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: 6 uA to Hall C. BSY2C tripped, DC power troubleshooting.

Log Number: 4488058Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 8 0 0

Log Number: 4488051Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

I've been snooping around for about an hour now
... Trying to investigate the South Linac LO after it brought south RF down

Figure 3:
Seems that, perhaps, chasing LO disturbances is really just chasing the weather

Perhaps better insulating would help?

Log Number: 4488042Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

Comment: Quick Check after unexpected disturbance in BPM's
Beam Conditions:
Total Linac Current (R2XXITOT) = 11.94
Hall A Current (IBC1H04CRCUR2) = 0
Hall B Current (IPM2C24A.IENG) = 2.75544
Hall C Current (IBC3H00CRCUR4) = 5.94
Hall D Current (IBCAD00CRCUR6) = 0
BSY Current (IBC4C00CRCUR5) = 0
INJ Energy (MMSINJEGAIN) = 38.9312
NL Energy (MMSLIN1EGAIN) = 345
SL Energy (MMSLIN2EGAIN) = 345

Gradient Problems:
0L02-7 Klystron Cathode Current (KCCU)=0.00402832 (<=0.7A)
0L03-1 Local Oscillator Power (LOPW)=54 (<=70mW)
1L04-8 GLDER=213 (>=200) with RF OFF - Check Detuning
1L06-1 GLDER=430 (>=200)

Log Number: 4488041Logbook(s): 

• DCLOG
• ELOG

Entry Makers: victorcBody: 

The trim card for this magnet was swapped along with many others as a part of general optics troubleshooting on April 9th, ATLis 119983. Seems like after the swap, voltage got a little weird. It's not affecting current though, but I think a reseat or another swap might be a decent idea. All readbacks before the swap on the 9th were stable.

Log Number: 4488040Logbook(s): 

• DCLOG
• ELOG

Entry Makers: victorcBody: 

Wouldn't take setpoint. Trim card swapped in has Analog Block 1.

Noting that the first trim card swap on 04/09/2026 was by DC Power due to general optics troubleshooting as a part of ATLis 119983.

Log Number: 4488036Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl02

Saved: dchri 04-16-26 05:08:52 {A:i B:3 C:2 E:345 A=BS B=CW C=CW D=BS 0R08=6.03 No dumps in.

Log Number: 4488035Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16739Title:
MDB1L26H mismatch, needs trim swap

Summary:
Ops is responding and will swap the trim card Duration:
10 minutes

Time Down:
16-Apr-2026 04:57

Time Up:

Log Number: 4488032Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16739Title:
MDB1L26H mismatch, needs trim swap

Summary:
Ops is responding and will swap the trim card Duration:
2 minutes

Time Down:
16-Apr-2026 04:57

Time Up:

Log Number: 4488024Logbook(s): 

• HBLOG
• ELOG

Entry Makers: kpriceBody: 

Log Number: 4488023Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16738Title:
Hall B dipole BSY2C trip on water flow

Summary:
Trip on water flow. came back no problem.

Log Number: 4488022Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16738Title:
Hall B dipole BSY2C trip on water flow

Summary:
Trip on water flow. came back no problem.

Log Number: 4488021Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

came back without issue. Cycling twice before resuming

Log Number: 4488019Logbook(s): 

• HBLOG
• ELOG

Entry Makers: kpriceBody: 

Log Number: 4488018Logbook(s): 

• HBLOG
• ELOG

Entry Makers: kpriceBody: 

Log Number: 4488017Logbook(s): 

• HBLOG
• ELOG

Entry Makers: kpriceBody: 

Log Number: 4488014Logbook(s): 

• ELOG

Body: 

Troubleshooting showed that the internal flow meter had failed. Since all box supplies have redundant flow sensors (internal and external) the decision was made to disable the internal sensor.