Aggregator

Log Number: 4543810Logbook(s): 

• POLOG
• ELOG

Entry Makers: suleimanBody: 

Preparing for Helicity Decoder Board beam study.

With Tsettle = 100 us.

Log Number: 4543809Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

CW inhibited. Masking set to 1D.

Log Number: 4543807Logbook(s): 

• ELOG
• SRFLOG

Body: 

Field Emission Measurements

2L24 - https://logbooks.jlab.org/entry/4543806
2L23 - https://logbooks.jlab.org/entry/4543782
2L05 - https://logbooks.jlab.org/entry/4543776

2L03 - omitted due to HV body current faults
2L03 - https://logbooks.jlab.org/entry/4543775

Log Number: 4543806Logbook(s): 

• SRFLOG
• ELOG
• RFLOG

Entry Makers: dchriBody: 

Scroll to last image for Vacuum & CWWT overview plot

Cavity 1
Limited by max single DecaRad 01 head < 10,000
* I had not realized DecaRad 9 exceeded 10,000 mR/hr until cavity 2 testing concluded
Start GLOS = 2.69
Start GMES = 17.7
Ramp up GLOS = 3.44
Ramp up GMES = 22.3
DecaRad 01 = ~9360
DecaRad 09 = ~12,224 (highest)

Cavity 2
Limited by Admin Limit GMES < 24 MV/m
* I had not realized DecaRad 10 exceeded 10,000 mR/hr until the test began
* Levels reduced quickly once the test began, my hope is that the DecaRad did not become saturated
* DecaRad 10 < 10,000 once cavity 2 = 18.2 MV/m
Start GL

Log Number: 4543805Logbook(s): 

• ELOG

Entry Makers: dchri

Log Number: 4543804Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-08-20 02:28:06 The output from the myRestore execution was as follows: iocsoftw4spce systemEnum@2026-08-20 02:28 2(2) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocsoftw4spce (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success

Log Number: 4543803Logbook(s): 

• SRFLOG
• CLOG
• ELOG
• RFLOG

Entry Makers: dchriBody: 

Parasitically logging 2L24 Flow Meter data during Field Emission testing
I am not ramping heaters or adjusting JT valves
This is for data logging purposes only

Future ATLis:
https://tasklists.jlab.org/atlis/tasks/121136

Log Number: 4543786Logbook(s): 

• ELOG
• RFLOG
• SRFLOG

Entry Makers: dchriBody: 

Fig. 1 - 2L24 GOOD in Hot checkout
Fig. 2 - JAM south RF authorized

Fig. 3 - Field Emission ATLis status is 'OK'
ATLis 118604
https://tasklists.jlab.org/atlis/tasks/118604
DecaRad is verified connected to zone 2L24 - per ATLis comment

Fig. 4 - Rates with RF Off determined to be < 10 mR/hr
Fig. 5 - Vacuum nominal

Log Number: 4543783Logbook(s): 

• ELOG

Entry Makers: dchriBody: 

Log Number: 4543782Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

Cavity 1: Started at 21 MV/m without quenching. Missed the "config decarad" step...aborted and started again at 21 MV/m.
Cavity 2: Quench >18.9.
Cavity 3: Started at 21 MV/m without quenching.
Cavity 4: Quench >12.7
Cavity 5: Started at 21 MV/m without quenching.
Cavity 6: Quenches above 20.6 MV/m.
Cavity 7: unable to raise gradient much above 20 despite increasing GLOS. Starting at 20 MV/m.
Cavity 8: Started at 24 MV/m

Log Number: 4543780Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             08/20/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4543776Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

Cavity 1: Started at 21 MV/m without quenching.
Cavity 2: Started at 21 MV/m without quenching.
Cavity 3: Cavity quenches above 19.7 MV/m (GLOS=3.75)
Cavity 4: Started at 21 MV/m without quenching. Field emission < 10 mRem/h
Cavity 5: Started at 21 MV/m without quenching.
Cavity 6: Started at 21 MV/m without quenching. Field emission < 10 mRem/h
Cavity 7: Started at 21 MV/m without quenching. Downstream vacuum valves closed. Restarted at 20.5 MV/m to completion
Cavity 8: Started at 21 MV/m without quenching.

Log Number: 4543775Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Not sure if this related to 2L03-8 modanode voltage. Ops-PRd for tracking. Moving on to 2L05 for FE Onset.

Log Number: 4543774Logbook(s): 

• ELOG
• RFLOG

Entry Makers: eformanBody: 

Attempting to run FE measurement on 2L03 but zone trips out of HV on body current.

Log Number: 4543773Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Bypassing so we can continue FE Onset.

Log Number: 4543770Logbook(s): 

• ELOG
• SRFPLASMA

Body: 

Set up DecaRads on 2L03, 2L05, 2L23 & 2L24.
Pulled DecaRad setups from 1L24 & 1L25.

All chs on all systems read normal background counts after set up.

Measured bias voltage of each chassis locally, to ensure a no-load bias of 0.5v, +/- .005.
Only the 2L24 bias was low; adjusted from 0.483v locally, to 0.510, and back to 0.500.
During this time, ch.10 inexplicably jumped to 6000+ cps, but that is likely just noise from turning the biasing pot.

The Epics readbacks all have slight offsets, but, assuming the channels are still linear, it's likely that the change in voltage, from unloaded tubes

Log Number: 4543769Logbook(s): 

• ELOG

Tags: 

• Autolog
• MCC8am

Body:  */ ATLis Comments Posted 18:00 Tuesday August 18 through 18:00 Wednesday August 19 AES RF Systems Perform rfMiram12GeV 1-0

2026-08-19 10:08 - Xavier Gomez

Would like to include

Log Number: 4543768Logbook(s): 

• ELOG

Body: 

Running FE Onset measurements on 2L03, 2L05, 2L23, 2L24

Log Number: 4543767Logbook(s): 

• ELOG

Entry Makers: jhowardBody: 

Log Number: 4543766Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Everything working as expected, v3.0 will be released soon.