Aggregator

Log Number: 4473317Logbook(s): 

• ELOG
• RADLOG

Entry Makers: dthomasBody: 

Log Number: 4473315Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             02/27/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4473314Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
Zone 2L08
Username: geesaman
Date/Time: 02-27-26_07:56:09
RF Status: Good
Comment: The door for SL08B18 was not fully shut. It is now closed and the interlocks clear.
Special Instructions: fault cleared by resetting CPS control panel switches (cycle one on left, then three on right, then fault reset)

Maintenance Tag: HPA Door SL08B18

Log Number: 4473312Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Inj500KeV
User: samari

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.