Aggregator

Log Number: 4537969Logbook(s): 

• ELOG
• LERFLOG

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

Date : 08-05-26
Time : 07:31:03
Day : Wednesday
Shift : Day

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

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

Log Number: 4537966Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

seems like beam ramp up to 70uA was (initially) reasonably fine, until even orbit lock (Arc 4) was tuned on. Soon after, the parade of 3R10 BLM trips led us to hunting for solutions.

Possibly ReCap restore (prior to even orbit locks turning on) may help... Also maintenance day begins in 30min...

\_(o_o)_/

Log Number: 4537961Logbook(s): 

• ELOG

Body: 

We made an access to check the p-trap and tygon hoses in building 95. No signs of anything obvious that would contribute to the O2 reading we are experiencing in the vent stack. There was no access to the hall C dump alcove due to time and current activation, but an access at first opportunity is recommended as an inspection.
Observation:
nothing out of place in building 95
New BPM (?) in the hall C alcove.

We will continue to monitor and troubleshoot the intermittent O2 spikes.

Log Number: 4537960Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW to B and D. Hall C taking Harp swipes.

Log Number: 4537959Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Beam off for maintenance day.

Log Number: 4537958Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4537956Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4537952Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17615Title:
Machine orbit corrections to alleviate ILM3R10 trips

Summary:
Tune beam dumplette to dumplette to try to isolate the problem.Duration:
1 minute

Time Down:
05-Aug-2026 0

Log Number: 4537951Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System Masking for: BeamLossMonitor
User: kprice
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
ILM8T09

Log Number: 4537950Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17614Title:
Troubleshooting more ILM3R10 trips

Summary:
Were tripping 3R10 BLM with xC at higher current.

Log Number: 4537942Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L14-1
Username: benesch
Date/Time: 08-05-26_07:04:47
RF Status: Good
Tuner Status: Good
Comment: DRVH=6.700 Arc Rate Management new emitter likely, two hour interval at 7
Previous OPS DRVH: 0
Special Instructions:

Log Number: 4537940Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17614Title:
Bringing in Arc 6 vertical

Summary:
Were tripping 3R10 BLM with xC at higher current. Ramping up xC slowly to 70 uA while we manually bring in Arc 6 vertical positions since we don't entirely trust Arc6Orb.

Log Number: 4537937Logbook(s): 

• ELOG

Entry Makers: delacruzBody: 

Scan data from:

08042026_22:17:08

08042026_22:15:01

The harp is producing usable data after repairs (preamp replacement).

Log Number: 4537932Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17613Title:
Touching up orbit into 6L

Summary:
Starting tripping 3R10 BLM. Hoping steering 5R into 6L here fixes the problem.

Log Number: 4537931Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: jhoward
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: 4537929Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17613Title:
Touching up orbit into 6L

Summary:
Starting tripping 3R10 BLM.

Log Number: 4537927Logbook(s): 

• ELOG
• RFLOG

Entry Makers: victorcBody: 

Cavity tripped out of SELAP on PLDE and the RF On script couldn't recover it. Did a POFF optimization and it came back up after that.

Log Number: 4537926Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 17612Title:
QE

Summary:
Daily QE MeasurementDuration:
7 minutes

Time Down:
05-Aug-2026 06:22

Time Up:
05-Aug-2026 06:29

Log Number: 4537925Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System Masking for: BeamLossMonitor
User: victorc
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
ILM8T0

Log Number: 4537924Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: CryoModule
User: victorc
Areas: NorthLinac SouthLinac

CryoModule Devices:
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26