Aggregator

Log Number: 4471771Logbook(s): 

• ELOG

Body: 

Only remaining area is 2L26 girders LCW valves. These will be done once their magnets are re-assembled and LCW hook up completed.

Log Number: 4471770Logbook(s): 

• ELOG

Body: 

HCO of 1S LCW valves and magnets performed, all good, HCO updated. Also did LCW valves shut for 2L03 swap. All associated valves open.

Log Number: 4471769Logbook(s): 

• POLOG
• ELOG

Body: Spot Location: (13250,19250), Charge: 1.998958

Laser Wavelength Atten Setting Laser Power Current HV PS Current QE PV Updated? Update Time/Reason Not Updated (nm) (W) (uA) </

Log Number: 4471768Logbook(s): 

• ELOG

Body: 

All leaks fixed, magnet re-installed

Log Number: 4471767Logbook(s): 

• ELOG

Body: 

Flow checks performed and passed IR check.

Log Number: 4471765Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

GASK was high enough to cause SOSing. Tried open-loop tuning but ultimately had to open up the attenuator considerably (9.3 -> 2) to get GASK into a reasonable range. This cavity is really touchy when it comes to tuner movement - no change for a long time, then huge swings with very few steps.

Log Number: 4471763Logbook(s): 

• SRFLOG
• CLOG
• ELOG

Entry Makers: dchriBody: 

ATLis https://tasklists.jlab.org/atlis/tasks/119484

Investigating the high heat load in 1L06

Initial JT parameters:
Sample Time = 120
Max Position = 85

Initial Heater parameters:
Requested Heat Watts = 165
LEM Requested RF Heat = 100

STEPS:
1. Reduce ST (JT sample time) to 30s
2. Raise Max Pos to 90%
3. Raise heater 'REQ HEAT WATTS' to 200W
4.

Log Number: 4471762Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

Cavity had trouble coming up. OLT and letting it rest at 11.5 MV/m (drive high 12 MV/m)

Log Number: 4471761Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: dchriBody: 

Spikes in VIP1L0640 while bringing up cavity 5

Initially, Forward power was way too high. open loop tune, walked cavity up...

Going to let it sit at 7.5 MV/m

Anything above that causes a Vac fault

Log Number: 4471760Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             02/17/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4471759Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: kprice 02-18-26 00:14:45 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4471758Logbook(s): 

• ELOG

Body: 

Subcontractor is tentatively scheduled to loaded revised Central Chiller System software on Thursday 2-19-26 which will require Building 60 chillers, primary pumps, secondary pumps, cooling tower pumps, and cooling tower fans to be switched to manual operation. The existing remote differential pressure sensor located at Test Lab TLA Air Handling Unit 58-AHU-2 will need to be replaced and revised control software loaded. Loading the revised control software will require a brief shutdown of 58-AHU-2 which conditions the TLA R&D Chem Room.

Log Number: 4471757Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-17-26
Time : 23:15:06
Day : Tuesday
Shift : Owl

Crew Chief : Price
Program Deputy: Buttles
Team : D
Designated SSO: Christian
LERF Operator:
Operators : Christian

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

Log Number: 4471756Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been GSET 0:
2L14-6
Username: bschauml
Date/Time: 02-17-26_22:36:27
RF Status: Bad
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - No CRFP Readback - ELOG 4471755
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4471755Logbook(s): 

• ELOG
• RFLOG

Entry Makers: bschaumlBody: 

Ramping the GLOD during an OLT did not produce any forward power but did produce gradient. Tuning proceeded normally apart from that, being careful about GLOD settings to tune the cavity to the typical peak GMES for a C25.

Log Number: 4471752Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: samari 02-17-26 22:18:40 {A:5 B:3 C:1 E:345 A=Tune B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4471751Logbook(s): 

• ELOG

Entry Makers: samariBody: 

Reverting the 0L match back to design fixed things greatly, then matching at IHA0L03 with the setup_345 workspace made for much improved optics at IHA0R05, a further 0L10 match made it very good. We are still getting ILM1L04B trips at anything > 40 uA given this setup, so more troubleshooting in orbit is required. Transmission is >90 across all 4 beams, and I believe this set up should be good for injector SME quality assurance.
Fig one, A/C orbit, Fig 2 A transmission, Fig 3 B wrt C, Fig 3 D wrt D.

Log Number: 4471750Logbook(s): 

• ELOG
• RFLOG

Entry Makers: bschaumlBody: 

We had the full 14 kV last night but this bay didn't come back up with the rest of them. There's also the weirdness of bay 2, but that's been like that for a while and the cavities seem to be doing just fine. Rama took a look at it and confirmed that I should open a PR.

Log Number: 4471741Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: samari
Areas: Injector

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09

Log Number: 4471737Logbook(s): 

• ELOG

Body: 

Comments:

Post Match, design is .23 x .59

Laser Used:

A Laser

Sigmas:

Peak 1 - x Sigma: 0.5817 Peak 2 - u Sigma: 0.3814 Peak 3 - y Sigma: 0.4257