Aggregator

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

Log Number: 4508979Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Facilities reset a chilled water pump locally. Temperatures in the injector are steadily recovering and laser amps are all nice and cool. We are switching from SAM -> ACC for BSList 120407.

Log Number: 4508978Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Injector
User: dchri

Log Number: 4508977Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: RF was turned on in:
R02
R03
R04

Log Number: 4508976Logbook(s): 

• ELOG
• POLOG

Tags: 

• Autolog

Body: 

Log Number: 4508975Logbook(s): 

• ELOG
• POLOG

Tags: 

• Autolog

Body: 

Log Number: 4508973Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Log Number: 4508972Logbook(s): 

• ELOG

Entry Makers: dchri

Log Number: 4508971Logbook(s): 

• ELOG

Entry Makers: suleimanBody: 

Got a call about the laser room temperature alarm - see Figure 1. Asked MCC to turn off the laser amplifiers.

Went downstairs, the injector area is way warmer than usual. The air units above the gun and above the booster are only blowing hot air.

Ops found the readbacks from these units are flat - see linked entry.

Once air units are working fine and temperature is back to normal, Ops can turn back on the laser amplifiers.

Log Number: 4508970Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Noticed that it felt quite warm downstairs in the injector. We looked at tunnel temps and they've been unresponsive since 6/02 @ 05:20. The Injector SB temps seem to be responding appropriately.

Facilities on-call was contacted earlier and they said the system seemed to be holding at the setpoints, but if they were just looking at instantaneous values or a small time-span in the archiver, then this could have been missed.

Fig 3: Some NL AHU Temps also seem to be unresponsive: AHU01, AHU02, AHU03, AHU04, and AHU05. Rack temps don't seem to be affected. AHUs went unresponsive on 6/01.

Log Number: 4508969Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Went down into the injector at the request of CIS to verify that the injector hut AC was powered on.

Figs 1 & 2: These two disconnect switches are on the wall to the right as you approach the gap between the laser hut and the wall. These are both off. The one in figure 2 seems to be spare, but don't know what the other one is.

Figs 3,4: These switches are located on the injector hut itself and they are both powered on.

Figs 5,6: Everything in the breaker panel is on except for breaker #10. This one seems to be a spare according to the diagram.

Log Number: 4508968Logbook(s): 

• ELOG

Body: ACC=>BOXES=>LAM1C=>MLAM1C has been enabled in alarm handler

Monitoring LAM1C during high-energy reconfig

Log Number: 4508967Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

No beam at the moment due to the laser hut temp issue. This could(?) be a downtime but it seems the alternate program in the shift plan is to switch to SAM if not actively sending beam. We'll pick up with some FE onset measurements that we weren't able to complete last night.

CIS on-call is enroute to further investigate laser hut based on our findings. Injector requested to remain in controlled access. Updates to follow.