Aggregator

Log Number: 4509000Logbook(s): 

• POLOG
• ELOG

Entry Makers: suleimanBody: 

Alerted MCC before we have to trun off amplifiers.

Log Number: 4508999Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl02
Data from: /usr/opdata/burt/allsnap/06-05-26_23:33:51
Restored file: /tmp/06-06-26_08:54:18.snap

Log Number: 4508998Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl02
Data from: /usr/opdata/burt/allsnap/06-05-26_16:28:24
Restored file: /tmp/06-06-26_08:53:16.snap

Log Number: 4508996Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: victorc 06-06-26 08:20:58 {A:i B:1 C:3 E:1060 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. dump(s) in.

Log Number: 4508995Logbook(s): 

• ELOG
• LERFLOG

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

The operator has read the following:

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

Log Number: 4508994Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Janak
DATE:             06/06/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4508993Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Degrader beam studies in progress.

Log Number: 4508992Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4508991Logbook(s): 

• BTLOG
• ELOG

Entry Makers: kpriceBody: 

Fig 1 shows that master slit interception is very very slightly higher when the central plug is *retracted*. The location of the central plug should have no bearing on MS interception at all. I could believe in the possibility of it seeing a hint of backscatter from the central plug when it's inserted but this seems to show the opposite, if only very slightly.

The angles of the central plug and C slit wrt y also make me suspicious.

Log Number: 4508990Logbook(s): 

• ELOG
• LERFLOG

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

Date : 06-06-26
Time : 08:02:19
Day : Saturday
Shift : Day

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

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

Log Number: 4508988Logbook(s): 

• BTLOG
• ELOG

Entry Makers: dchriBody: 

Previous test ran to FC#1
Today's test ran to FC#2

Fig. 1 - Previous test
Fig. 2 - Today's test (interception)
Fig. 3 - Today's test (positions)
Fig. 4 - Another look from previous test and today's test

- CC Noticed when central plug is taken out, master slit interception increases

- Gun uA sags throughout (as opposed to Fig.1 where previous test shows gun uA having more of a 'wave' like pattern

- Noticed a separation drift between IPM2I00A (X vs Y)

- Previous test A1 interception steady. Today's test A1 interception starts low then rises

- Previous test Laser Hut Temp steady.

Log Number: 4508985Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: deirBody: 

This occurred twice when ramping gradient in 2L05-8 in SEL. The first time VBV2L05B and both VBV2L06A and VBV2L06B closed, dropping RF in both zones. The second time, only VBV2L05B and VBV2L06A closed, dropping RF in 2L05.

No response in 2L05-8 WG Vac. Can see a response in 2L06 beamline vac.

Was able to recover it into SELAP at 12.0 then walk it back up to its ODVH of 16.8 without any issue.

Log Number: 4508984Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

MBC4A27H - mismatch
not taking setpoint
re-seed and took setpoint

... awaiting beam mode = 0 before cycle

Log Number: 4508983Logbook(s): 

• ELOG

Body: 

FE Onset Measurements for 2L03: https://logbooks.jlab.org/entry/4508981

Log Number: 4508982Logbook(s): 

• ELOG
• LERFLOG

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

The operator has read the following:

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

Log Number: 4508981Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Powered on DRADS05A.

Figure 3, Cav 1: FE Free up to 21 MV/m.
Figure 4, Cav 2: FE Free up to 21 MV/m.
Figure 5, Cav 3: FE Free up to 20.5 MV/m. Slight amount of FE starting at 20.5, but still below the FE Onset of 10 mRem/hr at 21 MV/m.
Figure 6, Cav 4: FE Onset at 18.5 MV/m
Figure 7, Cav 5: FE Onset at 18.5 MV/m
Figure 8, Cav 6: FE Onset at 17.7 MV/m
Figure 9, Cav 7: FE Free up to 21 MV/m
Figure 10, Cav 8: FE Onset at 13.5 MV/m. Cavity 8 limited to 18.8 MV/m. Was getting quench faults, so I masked the quench bits and tried to push it beyond 18.8, but the GMES readback seemed to saturate.

Log Number: 4508980Logbook(s): 

• BTLOG
• ELOG

Entry Makers: dchriBody: 

https://tasklists.jlab.org/bslist/tasks/120407

Fig. 1 - positions
Fig. 2 - some light steering back to RELs beforehand
Fig. 3 - RELs zeroed per BSList