Aggregator

Log Number: 4520272Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

It looks like they've been slowly repopulating the South Linac since the 1497 amp was replaced. I did notice the EMI shielding around the rack is arranged differently from before, maybe it just needs to be put back?

Log Number: 4520271Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Howard
DATE:             07/06/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4520268Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             07/06/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4520266Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Chaudhary
DATE:             07/06/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4520262Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW beam to Hall B.

Log Number: 4520260Logbook(s): 

• ELOG
• LERFLOG

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

Date : 07-05-26
Time : 23:50:28
Day : Sunday
Shift : Owl

Crew Chief : Price
Program Deputy: Duzik
Team : D
Arm : Christian
Designated SSO: Howard
LERF Operator:
Operators : Howard, Chaudhary, Christian

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

Log Number: 4520258Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl05

Saved: eforman 07-05-26 23:34:31 {A:i B:1 C:3 E:1060 A=BS B=CW C=BS D=BS 0R08=0.00 No dumps in.

Log Number: 4520257Logbook(s): 

• ELOG

Body: 

The Aux Power is what powers the filaments. When filaments are on and counted up, you get a hv ready and can toggle the HV on. When it doesn't go to HV, we make sure filaments are counted up and at correct voltages. After pushing master reset like the red button on the CPS, we can go ahead and slow start the HV. If it drops out for unknown reasons, do not take it to IDLE, call RF on-call to see if we can see anything that is causing a drop.

Log Number: 4520255Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4520252Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Don't no why it dropped HV but operator said they dropped it down idle and back and it still wouldn't go into HV. Should not take a zone to Idle when it drops HV due to the fact that filaments will need to be checked that they have counted up and back to what they were running. If you do this too fast without checking filaments are back up, it will not go to HV because the filaments aren't ready and you won't have a ready for HV enable. After filaments dropped for whatever reason unknown, HV drops out and that's all the cavity Quenches you see.

Log Number: 4520248Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

I was able to bring the zone back to idle shortly after returning from the SL service building. The crew chief had been unable to do this while I was on the phone with him. All I did locally was hit the front panel reset button and cycle the enable/disable key switch a couple times. There was a similar "aux" error to that described in the linked entry. I suppose if Hall B decides not to take beam for a while we could unbypass cavities 2-8, leaving 1 off because it was already bypassed.

Log Number: 4520247Logbook(s): 

• ELOG
• RFLOG

Entry Makers: eformanBody: 

After a rash of BLVFs from VIP1L25B, I lowered the ODVH of cavity 2 from 12 to 11. I noted that this cavity had the largest effect on the downstream neutron detector. We've been ~7 hours without a BLVF in 1L25 so far.

Log Number: 4520246Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

cavity 1 started experiencing arc faults when trying to recover RF, so Ben did an OLT on it

Log Number: 4520245Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L25-2
Username: eforman
Date/Time: 07-05-26_22:45:35
RF Status: Good
Tuner Status: Good
Comment: DRVH=11.000 Lowered from 12 -> 11 to try to control BLVFs. Seems to be working for the past 6 hours.
Previous OPS DRVH: 12
Special Instructions:

Log Number: 4520243Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

This cavity developed slow/sluggish tuning last month and had over temp on the stepper motor when it was constantly trying to tune and overheating. It will tune slowly if walked up with OLT but with tuner left in manual, any beam loading that changes cavity tuning will drop it out. If you constantly try to bring it up and it has 6kw CRFP being sent to the cavity, it will continue to trip until re-tuned and nominal CRFP. Tuner needs to be checked for operation and I think SRF has installed a high torque stepper on this cavity tuner.

Log Number: 4520240Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17344Title:
2L18 dropped out of high voltage

Summary:
Tried taking zone to idle then back up to HV with no luck.

Log Number: 4520239Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: eforman
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
ILM

Log Number: 4520238Logbook(s): 

• ELOG

Body: 

HYST AREA Version 7-0 has successfully cycled the following:

Area.Linacs.South

Total Time: 3.133 mins

Log Number: 4520237Logbook(s): 

• ELOG

Entry Makers: yoonBody: 

Log Number: 4520236Logbook(s): 

• ELOG
• CLOG

Tags: 

• Autolog

Body: LEM 9.19.5 was successfully run for the South Linac on 2026-07-05 22:14:48. The application phase took 00:01:45 to complete.