Aggregator

Log Number: 4472180Logbook(s): 

• CLOG
• ELOG
• RFLOG
• SRFLOG

Entry Makers: dchriBody: 

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

Investigating the high heat load in 1L06

Finishing the measurement started on Feb 19th 2026 (see linked ELog)

1Initial 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 80W
4.

Log Number: 4472179Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Cavit ywas SEL Quenching when transitioning to SELA. Saw it was only reaching about 10.8 MV/m out of the 12 MV/m GSET, so I increased KPOWLim a bit and was able to recover the cavity.

It dropped to SEL again a couple of hours later and started SEL Quenching again when transitioning to SELA. Decided to look into it a bit further...

KCCU has been unstable recently. It was pretty steady up until about 19:30 last night. It started drooping and cavity dropped to SEL. Filament voltage looks steady.

Log Number: 4472178Logbook(s): 

• POLOG
• ELOG

Body: 

- Measured QE anisotropy of photocathode.

Log Number: 4472177Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
1L14-3
Username: deir
Date/Time: 02-20-26_04:52:39
RF Status: Good
Tuner Status: Good
Comment: Recovered by RF 2/12
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4472176Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
1L14-2
Username: deir
Date/Time: 02-20-26_04:52:39
RF Status: Good
Tuner Status: Good
Comment: Recovered by RF 2/12
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4472175Logbook(s): 

• MOLLER
• ELOG

Tags: 

• Moller
• PD

Entry Makers: jonesgaskelldwinesberdnikcipriandougBody: 

Hall A Techs reinstalled dump fencing at located at front of dump. Techs started process of removing lead bricks used as shielding in front of dump to make space for upcoming pion donut move. Techs also begin process of setting anchors/epoxy for pion donut stand.

Log Number: 4472174Logbook(s): 

• CLOG
• ELOG

Entry Makers: dchriBody: 

exspect changes to Cryo Heaters and JT valve

Log Number: 4472173Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl03

Saved: bschauml 02-20-26 00:41:13 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4472172Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Performed OLT, found max GMES of ~3.2 MV/m with 0.4 kW CRFP.

GMES stable with loops open. Cavity tripped immediately upon leaving expert mode. Reset and turned it back on and GMES/GASK and PMES/PASK became highly unstable.

Log Number: 4472171Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Jerone tried a few combinations of allsaves as well as tweaking all manner of phases and eventually settled on the tack that I have been taking tonight: use the allsave he took when he optimized phases to the 1D, download design, and set up from scratch.

The 0L03 match has been challenging every time we try to take data for it as the K1 range only goes so far before the wire scans exhibit a very substantial shoulder.

Log Number: 4472170Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Christian
DATE:             02/20/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4472169Logbook(s): 

• ELOG
• SRFLOG

Entry Makers: duttonBody: 

Completed +/- 225 khz tuner exercise on cavities:1,2,5,6,7

Log Number: 4472168Logbook(s): 

• ELOG
• BTLOG

Body: Emittance Measurement: IHA0L03 X-plane - A bit more reasonable. Taking a look at viewers at the higher K1s to figure out that shoulder.
qsUtility zigzag_dataColletor V7-34
HOSTNAME: opsl03 CED WORKSPACE: OPS CED LOGIN KEY: pro

Log Number: 4472166Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Fig. 1: Energy set in 2D
Fig. 2: Changes to phase/amplitude
Fig. 3-7: Viewer walk, much improved
Fig. 8: A reasonable harp swipe! Let's try to get that match data again.

Log Number: 4472165Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-19-26
Time : 23:11:35
Day : Thursday
Shift : Owl

Crew Chief : Deir
Program Deputy: Buttles
Team : A
Arm : RADCON
Designated SSO: Christian
LERF Operator:
Operators : Christian

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

Log Number: 4472164Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

I am attempting to get good data for a match. Beam with optics on design at ITV0L04 is shown in Fig. 2. With the MQJ0L03 quad set to zero as it is when zigzag is collecting IHA0L03 data, the beam is as shown in Fig. 3. With everything on design ITV0L03 is way off (Fig. 4) the 0.533 x 1.92 mm sigmas specified in CED. Tweaking the first two matching quads, MQJ0L02 and MQJ0L02A, produced a beam spot (Fig. 5) that fits the CED aspect ratio and produced a... different looking spot on 0L04. This doesn't look matchable. I'm going to revisit the booster setup.

Log Number: 4472163Logbook(s): 

• ELOG
• BTLOG

Body: Emittance Measurement: IHA0L03 X-plane - ABORTED - Data Is Garbage
qsUtility zigzag_dataColletor V7-34
HOSTNAME: opsl03 CED WORKSPACE: OPS CED LOGIN KEY: pro

Log Number: 4472162Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Orbit, viewers, and 0L03 harp scan before 0L03 match

Log Number: 4472160Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Fig. 1 & 2 - Viewers before booster ballpark phasing. I know the relative phases should be pretty close so I should be able to get the gangphase close before going to the spectrometer by making the beam spots look (more) reasonable on d/s viewers.
Fig. 3 & 4 - Viewers after booster ballpark phasing. Onward to the 2D!
Fig. 5 - Flattened orbit in preparation to go to 2D.
Fig. 6 - Beam as found
Fig. 7 - Took out 26 degree 7-cell offset
Fig.

Log Number: 4472159Logbook(s): 

• ELOG

Entry Makers: bschaumlBody: 

Fig. 1 & 2 - centered through MFX0I07
Fig. 3 & 4 - centered through A3 and A4
Checked MFX0I07 after this. Still good.
Fig. 5 - orbit after centering