Aggregator

Log Number: 4468962Logbook(s): 

• ELOG

Entry Makers: bjacobBody: 

We will not be sending beam down either of these lines for today's beam studies. Additionally, VBV0L01B is on another unmasked channel so we will still be alerted if this valve closes.

Making this log because, while we have standing orders indicating that masking VBV3D00 is okay, I couldn't find any documentation on VBV5D00. According to the Injector Quick reference doc, VBV5D00 is disconnected at this time. As such, it may make sense to add VBV5D00 to ABIL.

Log Number: 4468961Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Destination Masking to: Inj5MeV
User: dthomas

Log Number: 4468960Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             02/07/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4468958Logbook(s): 

• ELOG
• LERFLOG

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

Date : 02-07-26
Time : 07:24:44
Day : Saturday
Shift : Day

Crew Chief : Blackshaw
Program Deputy: Mock
Team : E
Arm : RadCon
Designated SSO: Thomas
LERF Operator:
Operators : Thomas

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

Log Number: 4468956Logbook(s): 

• POLOG
• ELOG

Body: 
Record

Log Number: 4468955Logbook(s): 

• ELOG

Body: 

More 1L02 recovery: https://logbooks.jlab.org/entry/4468952

Log Number: 4468954Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Log Number: 4468953Logbook(s): 

• POLOG
• ELOG

Body: 
Record

Log Number: 4468952Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Picking up from last night to push gradient in the last two cavities of 1L02. Also looks like there might be some room to keep pushing cavity 4 if I take it slow. LEM req heat is set per hypothetical LEM at 990 MeV.

Took a break from ramping gradient to try tuning this zone after finding cavity 8 quench limited to ~9 MV/m. Cavity 1 seems to be driving the slightly elevated beamline vacuum for this zone, along with having a worrisome constant KRRP of ~0.12.

Pushed cavity 4 to 7.6 MV/m (quench limited). Got cavity 7 to its ODVH but only managed 9.1 MV/m in cavity 8 in the end.

Log Number: 4468951Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: Ran from opsl05

Finished after 19 iterations.

GREY: RF OFF
RATNI RED: <= 3.0 dB
GASKL RED: <1.8 V or > 2.4 V

Log Number: 4468950Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

It wasn't very effective...

Log Number: 4468949Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Lots of improvement in CRFP and GASK, though both still high. Slight improvement in klystron reflected power, though also still high.

Log Number: 4468948Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Looks a little happier now.

Log Number: 4468947Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Virtually no change in anything except klystron reflected power, which was reduced from 0.04 to 0.02.

Log Number: 4468946Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Forward power changes with gradient and tuner movement when both loops are open. Shouldn't it stay roughly constant once the GLOD is set to put ~0.4 kW into the cavity?

Tuning didn't do much here.

Log Number: 4468945Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

At least when setting GLOD for open-loop tuning, the CRFP readback stays at zero for quite a while after gradient appears in the cavity. Tuning seems to have done some good for this one, though I did trade a little klystron reflected power to bring the GASK way down. Don't mind the very long excursion I took with the tuner in the middle there, I was probing some weird behavior in the detune angle.

Log Number: 4468944Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl03

Saved: msmith 02-07-26 02:46:44 {A:5 B:3 C:1 E:340 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in.

Log Number: 4468943Logbook(s): 

• ELOG

Entry Makers: msmithBody: 

Fig.1-6: Viewer walk after setup
Fig.3: Changes to magnets
Fig.4-5: Final Orbit

Log Number: 4468942Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

This cavity detunes wildly every time it trips. I tried to find the best spot to zero the detune angle but it may need to be revisited. I'll run trim up/trim down when I'm finished with this zone as well.

Log Number: 4468941Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl03

Saved: msmith 02-07-26 01:09:22 {A:5 B:3 C:1 E:340 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in.