Aggregator

Log Number: 4490566Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Entry Makers: msmithBody: 

Cavity 3: Quench limited around 19.5 MV/m

Log Number: 4490565Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Inj500KeV
User: deir

Log Number: 4490563Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Alarms say Exit Stair 1 door was opened. Investigating now.

Log Number: 4490562Logbook(s): 

• DCLOG
• ELOG

Entry Makers: msmithBody: 

Log Number: 4490560Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             04/23/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4490559Logbook(s): 

• SRFLOG
• CLOG
• ELOG

Entry Makers: dchriBody: 

Liquid Levels in 2L25 getting low due to JT valve being locked at ~60%
Heaters are ramping down, Levels will recover. Expect minor Alarms such as Liquid Levels to go in and out of alarm until Flow Measurements are complete

Log Number: 4490558Logbook(s): 

• CLOG
• ELOG

Entry Makers: dchriBody: 

It's not from 2L25 Flow Meter measurements. Cryo is looking into it

Log Number: 4490557Logbook(s): 

• HBLOG
• PRADLOG
• ELOG
• TARGETLOG

Body: 

We flowed helium with flow rate 110cc/min at room temperature (~293K) at 11:00 pm on Aprl 22, 2026.
The cryochiller was turned on at 11:20 pm. The following is the target screen overview after truning on the cryochiller.

Log Number: 4490555Logbook(s): 

• ELOG
• LERFLOG

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

Date : 04-22-26
Time : 23:14:03
Day : Wednesday
Shift : Owl

Crew Chief : Deir
Program Deputy: Sereno
Team : A
Arm : RADCON
Designated SSO: Smith
LERF Operator:
Operators : Smith

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

Log Number: 4490556Logbook(s): 

• SRFLOG
• CLOG
• ELOG

Entry Makers: dchriBody: 

Q0 Measurements via Flow Meter on Zone 2L25
https://tasklists.jlab.org/atlis/tasks/120026

Ramping down Cryo Heaters to ~30W or so
JT Valve will be manipulated for measurements
Cryo stability is being watched

Log Number: 4490553Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift:

Log Number: 4490552Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4490551Logbook(s): 

• ELOG
• RFLOG

Entry Makers: bschaumlBody: 

Infodumped any screen that looked vaguely useful.

Log Number: 4490550Logbook(s): 

• ELOG

Body: 

HYST AREA Version 7-0 has successfully cycled the following:

MQJ0L01
MQJ0L02
MQJ0L02A
MQJ0L03A
MQJ0L03
MQJ0L04
MQJ0L05
MQD0L06
MQB0L07
MQB0L08
MQB0L09
MQB0L10

Total Time: 1.167 mins

Log Number: 4490549Logbook(s): 

• ELOG

Body: 

HYST AREA Version 7-0 has successfully cycled the following:

MFX2I01
MFX1I03
MFG1I04A
MFX0I01
MFA0I03
MFD0I04
MFA0I05
MFX0I05
MFX0I06
MFX0I07

Total Time: 0.683 mins

Log Number: 4490548Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01
Data from: /usr/opdata/burt/allsnap/04-21-26_22:22:02
Restored file: /tmp/04-22-26_22:14:41.snap


Setting up for the next phase of MOLLER study

Log Number: 4490547Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01

Saved: bschauml 04-22-26 22:14:23 {A:i B:3 C:2 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. Autosave prior to restore.

Log Number: 4490545Logbook(s): 

• ELOG

Body: HALLD has been disabled in alarm handler

Nuisance alarms.

Log Number: 4490543Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

To help assure the MOLLER folks that our spin flippers are flipping correctly (right): Figure 1 shows the various BdLs that the Injector Steering Script sets for various flip configurations. Note that "Flip Right" sets a positive BdL in each solenoid. The field for both solenoids is currently set to be positive, each with a positive current, as shown in Figures 2 and 3. The Spin Controls screen in figure 4 shows, in the middle column, the positive currents for each solenoid. However, the Flip State readback on the bottom of the screen says "Flip Left" because this is the end result of the VWien precessing spin downwards and the spin flipper solenoids precessing the downward spin in a right-handed direction.

Log Number: 4490542Logbook(s): 

• ELOG
• SRFLOG

Body: 

Completed a one hour run on cavity 3 at 20.1 MV/m
Cavity 4: Emax = 22.8 MV/m with a one hour run at 22.5 MV/m Heavy Field emission
Cavity 8: Emax = 15.3 MV/m with a one hour run at 14.8 MV/m light FE

We are ready to do some dP/dt Qo's tomorrow for comparison with the mass flow measurements being done on Owl shift