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Opened VBV0I06, closed booster valves

13 hours 30 minutes 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

13 hours 30 minutes 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

14 hours 41 minutes 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

17 hours 5 minutes 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

Operator SIGN IN

18 hours 26 minutes ago
Log Number: 4475267Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             03/10/2026
SHIFT:               Owl

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log
msmith

Operator SIGN IN

18 hours 29 minutes ago
Log Number: 4475266Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Samari
DATE:             03/10/2026
SHIFT:               Owl

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log
samari

MXM3R04 Mismatch

18 hours 47 minutes ago
Log Number: 4475265Logbook(s): Entry Makers: alexsBody: 

Current suddenly dropped to 0 and voltage increased ~1 V. Jostling the current setpoint woke it back up.

alexs

CREW CHIEF SIGN IN

19 hours 25 minutes ago
Log Number: 4475263Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 03-09-26
Time : 23:02:02
Day : Monday
Shift : Owl

Crew Chief : Deir
Program Deputy: Schoene
Team : A
Arm : Smith
Designated SSO: Samari
LERF Operator:
Operators : Samari, Smith

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

2L25 Commissioning Swing Shift

20 hours 10 minutes ago
Log Number: 4475262Logbook(s): Body: 

Set out to confirm FE measurements for Cavities 1 and 3.
Cavity 3 appears to have popped a new field emitter (?) at some point. Found FE onset at 6.2 MV/m and the cavity quenching at ~11 MV/m after running at 18 MV/m on Friday. No event today that might signify a new field emitter. Cavity gradient was very unstable in both SEL and
Pulsed. Gradient would randomly start drooping. And towards the end of the new one hour run at 10.5 MV/m, the gradient began stepping up and down by several MV/m.

drury

1L02-7 lost comms, dropped zone HV

20 hours 13 minutes ago
Log Number: 4475261Logbook(s): Entry Makers: alexsBody: 

RFCM lost comms and dropped high voltage (figure 1,2). A local reset brought it back to life, and recovered HV and RF. Listing this as an OPS-PR for RF SME review and because there is a lingering limit fault on the comms screen I have forgotten how to clear (figure 3). No other steps with the RFCM were taken besides the local reset.

alexs

2L25 Liquid Level Alarm

21 hours 59 minutes ago
Log Number: 4475258Logbook(s): Entry Makers: johnwBody: 

Around 7:00pm, 2L25 dropped into its low level alarm. This appears to be due to RF starting up. The liquid level has come back up to near its normal, but is less stable than before. The JT valve responded as expected, and no other issues are noted.

Note: The LEM value and/or the REQ Heat Watts for this cryomodule may need to be adjusted.

johnw

Shift Information

Shift Swing
CEBAF Program
MCC Crew Chief Humphry
MCC Operators Anthony, Shenenberger, Shriner
Program Deputy Schoene
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