Aggregator

Log Number: 4473311Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632
Data from: /usr/opdata/burt/allsnap/02-20-26_10:39:09
Restored file: /tmp/02-27-26_07:36:57.snap


downloading MOLLER V=H=0

Log Number: 4473310Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: samari 02-27-26 07:36:42 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. Autosave prior to restore.

Log Number: 4473308Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-27-26
Time : 07:09:27
Day : Friday
Shift : Day

Crew Chief : Humphry
Program Deputy: Schoene
Team : X
Arm : RadCon
Designated SSO: Thomas
LERF Operator:
Operators : Barker, Thomas

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

Log Number: 4473307Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: High Voltage was turned off for:
R02
R03
R04
R12
R14
R15
R16
R17
R18
R19
R1A
R1B
R1C
R1D
R1E
R1F
R1G
R1H
R1I
R1J
R1K
R1L
R1M
R1N
R1O
R1P
R1Q

Log Number: 4473306Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: High Voltage was turned off for:
R22
R23
R24
R25
R26
R27
R28
R29
R2A
R2B
R2C
R2D
R2E
R2F
R2G
R2H
R2I
R2J
R2K
R2L
R2M
R2N
R2O
R2P
R2Q

Log Number: 4473305Logbook(s): 

• POLOG
• ELOG

Body: 

- Continue with measurements of electrical pick-up of real-time helicity signal.

Log Number: 4473303Logbook(s): 

• POLOG
• ELOG

Body: Spot Location: (13250,19250), Charge: 4.23076

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

Log Number: 4473301Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

This cavity continues to struggle. I have OLT'd it and it seems to be doing a bit better but im not hopeful it will stay that way.

Log Number: 4473300Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Head is already bypassed. Not sure why it alarmed

Log Number: 4473299Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Cavity has SOS'd while 5MV/m multiple times this shift. OVDH is 3.9 and the target gset is 0 so I've reduced it to 3.9 for now.

Log Number: 4473298Logbook(s): 

• ELOG

Body: 

New measurements by request for 1L05-{2, 5, 7} https://logbooks.jlab.org/entry/4473293
and 1L10-{1, 5} https://logbooks.jlab.org/entry/4473297

Log Number: 4473297Logbook(s): 

• SRFPLASMA
• SRFLOG
• ELOG

Entry Makers: kpriceBody: 

Cavity 1: Decarads 1 and 10 ~7000. ~12.3 MV/m starting.

Cavity 5: Decarad 10 ~9700. ~11.8 MV/m starting.

Turned Decarad HV off and restored initial GLOS values. Also put linac quads back where I found them.

Log Number: 4473293Logbook(s): 

• SRFPLASMA
• SRFLOG
• ELOG

Entry Makers: kpriceBody: 

Cavity 2: Took one set of measurements with background that was too high, so killed that file and fixed the background situation with linac quads. Let vacuum settle for a long time before taking second run, as Decarads quieted along with recovering vacuum. Started at ~14.3 MV/m; Decarad 9 at ~8700.

Log Number: 4473289Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Found cavities 3 and 4 sitting below their target gsets and cavity 5 sitting a little high. Nothing was in the logbook about 3 and 4, cavity 5 was OLT's on swing and brough back a little high. I walked everything back to their target gsets.

Log Number: 4473286Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             02/26/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4473284Logbook(s): 

• ELOG

Entry Makers: samariBody: 

Starting by loading up the updated setup_345 design values. After a while of trying to figure out a solution to the problem of much more emittance in both X and Y than expected and overall puzzling optics beyond what either Victor or I could backpropagate, Victor and I realized by varying 0L02/A quads while looking at ITV0L03 that the beam was extremely coupled. We empirically set MQS0L01 to -10 G/cm and found that it uncoupled the planes well. This is a definite mystery, as we should have no coupling and the degrader solenoid is off.

Log Number: 4473283Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: samari 02-26-26 23:21:02 {A:5 B:3 C:1 E:345 A=CW B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4473281Logbook(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: 4473282Logbook(s): 

• ELOG
• RFLOG

Entry Makers: victorcBody: 

Ops got the verbal OK from RF SME to turn 1L19 back on after the bad 5V supply was replaced, fixing the arc test fault issues. However, the zone is currently not marked readied in the SRM so, until that happens, Ops will keep RF off for 1L19.

Log Number: 4473280Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System 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