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CREW CHIEF SIGN IN

1 day 3 hours ago
Log Number: 4475293Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 03-10-26
Time : 07:11:13
Day : Tuesday
Shift : Day

Crew Chief : Mock
Program Deputy: Schoene
Team : B
Arm : Barker
Designated SSO: Thomas
LERF Operator:
Operators : Barker, Thomas

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

Box Supplies Were Turned Off

1 day 3 hours ago
Log Number: 4475291Logbook(s): Tags: Body: 

The following box supplies were TURNED OFF by version 2-16 of the Box Supply Cycling Script:
ARC1A Ramp Rate = 6.964 A/s
ARC2A Ramp Rate = 6.712 A/s
ARC3A Ramp Rate = 9.294 A/s
ARC4A Ramp Rate = 9.299 A/s
ARC5A Ramp Rate = 9.307 A/s
ARC6A Ramp Rate = 8.835 A/s
ARC8A Ramp Rate = 10.637 A/s
ARC9A Ramp Rate = 9.322 A/s
ARCAA Ramp Rate = 10.852 A/s
DOG1E Ramp Rate = 2.750 A/s
DOG2E Ramp Rate N/A
DOG3E Ramp Rate N/A
DOG4E Ramp Rate N/A
DOG5E Ramp Rate N/A
DOG6E Ramp Rate N/A
DOG7E Ramp Rate N/A
DOG8E Ramp Rate N/A
DOG9E Ramp Rate N/A
RSEP8A Ramp Rate = 10.104 A/s
RSEP9A

alarms

Prebuncher + buncher phasing

1 day 3 hours ago
Log Number: 4475289Logbook(s): Entry Makers: samariBody: 

I loaded the values for the prebuncher and buncher from the 2024 all save (pb=3.55, b=4.3 gset), and phased accordingly.

Fig 1: Prebuncher + buncher off
Fig 2: Prebuncher on
Fig 3: Buncher+prebuncher on

samari

VL Steer to 1D

1 day 4 hours ago
Log Number: 4475288Logbook(s): Entry Makers: samariBody: 

Loaded All save from previously known 140 KeV set up (wiens off), then threaded beam through to the 1D with all warm RF off. I had to make a few solenoid changes to get good enough beam for transport. I roughly centered through all lenses up to 1D. Attached is the viewer walk and the differences from the all save.

samari

Autolog restore

1 day 5 hours ago
Log Number: 4475285Logbook(s): Tags: Body: saver ran from opsl632
Data from: /usr/opdata/burt/allsnap/05-09-24_15:52:54
Restored file: /tmp/03-10-26_05:02:34.snap


Downloading 2024 run all save
samari

Opened VBV0I06, closed booster valves

1 day 5 hours ago
Log Number: 4475284Logbook(s): Entry Makers: deirBody: 

Reset masking to Injector 500keV.

Opened up VBV0I06 to clear FSD. Closed the valves around the booster. The 0I06 valve was closed as a precaution to protect the booster. Since we are back to being limited to Mode 0, the booster RF cannot be turned on so there is no issue with keeping those valves closed.

deir

Autolog save

1 day 5 hours ago
Log Number: 4475283Logbook(s): Tags: Body: saver ran from opsl632

Saved: samari 03-10-26 05:02:15 {A:i B:5 C:2 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. Autosave prior to restore.
samari

COMMENT ON Gun2 photocathode Heat and Activation - March 2026

1 day 6 hours ago
Log Number: 4475272Logbook(s): Body: 

The SLSP-5247-4 GaAs photocathode mounted on puck #3 has been activated with 15 yo-yo's (5 mm mask). The puck has been inserted in the gun with the ear at about 15 degrees CCW from the vertical direction (same angle as before). At the long manipulator, this corresponds to 25 degrees.

The HV bias was set to "5" on the battery box. The picoammeter was set 200 nA Full Scale then 2 uA after the second yo-yo.

The Cs was heated with 4.6 A (0.98 V) and vacuum went to 9 nA. The first QE Cs peak started to show up after 14 minutes.

suleiman

Exit Stair 4 Dehumidifier Off and No Longer Detuning

1 day 9 hours ago
Log Number: 4475269Logbook(s): Entry Makers: samariBody: 

17 hours ago at around 8:05, the exit stair 4 dehumidifier was turned off to verify that it was the cause of the detuning. We see that when it is turned off it has a massive effect. While it was on, we saw many cavities frequently hitting their step limit of 50k (middle graph in Fig 1). Afterwards, the cavities are tuning regularly and have consistent forward power (fig 2).

It would be really helpful to do this same exercise with the exit stair 1 dehumidifier, as we see the exact same issue happening in zones 1L16:1L21.

samari

Shift Information

Shift Day
CEBAF Program
MCC Crew Chief Mock
MCC Operators Barker, Thomas
Program Deputy Schoene
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