Aggregator

Log Number: 4496634Logbook(s): 

• ELOG

Tags: 

• Autolog
• MCC8am

Body:  */ ATLis Comments Posted 18:00 Thursday May 07 through 18:00 Friday May 08 AES Safety Systems Routine Maintenance of ODH Systems (Managed by SSG).

2026-05-08 16:05 - Liliia Krylach

Log Number: 4496628Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl05

Saved: eforman 05-08-26 17:31:07 {A:i B:5 C:2 E:345 A=BS B=CW C=Tune D=CW 0R08=5.07 C dump(s) in.

Log Number: 4496627Logbook(s): 

• HBLOG
• ELOG

Entry Makers: eformanBody: 

Twice in the past hour, we have had bursts of noise on the upstream halo counters that seem to be uncorrelated to beam in the machine. In figs. 1 & 2 the upstream halo counter is in brown, injector BCM is in pink. Note that the noise in the upstream halo counter appears while sending beam and trips the beam off. Despite beam off, the noise continues for several minutes until it suddenly stops without intervention.
Hall B was contacted and their system expert is investigating.

Log Number: 4496620Logbook(s): 

• DCLOG
• ELOG

Entry Makers: shrinerBody: 

took setpoint and cycled; no TC swap

Log Number: 4496618Logbook(s): 

• ELOG
• LERFLOG

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

Date : 05-08-26
Time : 15:26:56
Day : Friday
Shift : Swing

Crew Chief : Forman
Program Deputy: Drury
Team : X
Arm : Shriner
Designated SSO: Shenenberger
LERF Operator:
Operators : Anthony, Shenenberger, Shriner

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

Log Number: 4496616Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

Hall D beam currently using chopper slit A. When A slit was closed down to 17mm, current stability was very poor, bouncing between 0 & 28 nA while trying to send 25 nA. Opening the Hall D slit reduces current instability to +/- 2 nA.

No deleterious effects on Hall B halo rates noted.

We were sending Hall C witness tune beam at the time in addition to B & D CW.

Log Number: 4496615Logbook(s): 

• HBLOG
• ELOG

Entry Makers: alexsBody: 

Not long after opening Hall D's slit in an attempt to stabilize their current, began seeing jumps in upstream halo rates at Hall B. We assumed this was a consequence of increased bleedthrough, but now we're seeing counts with the beam off, tripping FSD on halo counts without actually sending. We are confused, to say the least.

Log Number: 4496614Logbook(s): 

• ELOG
• SRFLOG

Body: 

No major update.

Log Number: 4496613Logbook(s): 

• ELOG

Body: 

The sensor for OM205 in the LERF has been replaced. The unit will be returned to service after 2-day warm-up period.

Log Number: 4496609Logbook(s): 

• HBLOG
• ELOG

Entry Makers: alexsBody: 

Log Number: 4496607Logbook(s): 

• HBLOG
• ELOG

Entry Makers: alexsBody: 

Log Number: 4496604Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Looks like over owl shift we were maintaining 180 nA with about 420 on the xB atten.

There's some obvious horizontal drift pre-chopper that's tracking with loss in the chopper, and thus xB attenuator and gun current.

Log Number: 4496603Logbook(s): 

• POLOG
• ELOG

Entry Makers: eformanBody: 

Log Number: 4496602Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Anthony
DATE:             05/08/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4496600Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Shenenberger
DATE:             05/08/2026
SHIFT:               Swing

The operator has read the following:

Log Number: 4496599Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Shriner
DATE:             05/08/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4496585Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

Found the Hall D slit open (-1) sending beam to B & D (fig. 1). Closed D slit down to 17mm per standing order.

Log Number: 4496580Logbook(s): 

• POLOG
• ELOG

Entry Makers: eformanBody: 

Hall B current started becoming erratic, noted that increasingly higher attenuator required to maintain current & frequent max-juice trips. Adjusting hall B laser phase from -121.3 to -123.3 stabilized the current and reduced the attenuator to a more reasonable level.

Log Number: 4496579Logbook(s): 

• HBLOG
• ELOG

Entry Makers: bbarkerBody: 

Log Number: 4496573Logbook(s): 

• ELOG

Entry Makers: dthomas