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Phaser Results

23 hours 41 minutes ago
Log Number: 4516268Logbook(s): Body: Results where Job # is 1026 {29} CAVITY PHASE ERROR (DEGREES) OUTCOME PHASE (DEGREES) START DATE DURATION (SECONDS) CORRECTION DATE CORRECTION ERROR REASON 2L20-8 BYPASSED 24-Jun-2026 23:59 0 24-
yoon

CREW CHIEF SIGN IN

1 day ago
Log Number: 4516261Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 06-24-26
Time : 23:30:35
Day : Wednesday
Shift : Owl

Crew Chief : Howard
Program Deputy: Nissen
Team : D
Arm : Chaudhary
Designated SSO: Price
LERF Operator:
Operators : Price, Chaudhary, Christian

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

COMMENT ON RF Maintenance June 24th, 2026

1 day 1 hour ago
Log Number: 4516250Logbook(s): Body: 

RF maintenance day summary

NL( +10MeV from the maintenance work )

1L07-1 FCC replacement 

1L09-2 Tube replacement +5.7MeV

1L09-5 removed attenuation and Klystron characterization

1L20-1 2.5w drive amp replacement +4.3

1L21-5 Arc detector work 

SL (+43MeV from the maintenance work)

2L02- 2,3,4,5,6,7,8 recovery after cavity 1 T/S +25.2MeV

2L07-4 Arc detector work +3.7MeV

2L20-8 recovery +2.2MeV

2L25-FCC replacement

2L26-3 Bay 1HV recovery +12.2 MeV

While bringing back the machine we they had to bypass 1L23-8 (high KCCU -4.2MeV) and few cavities in 2L03 and 2L05( for 120Hz oscillati

jkt

2L03 and 2L05 instability

1 day 1 hour ago
Log Number: 4516249Logbook(s): Entry Makers: jktxgomezBody: 

recovering 2L03 and 2L05 after the maintenance day took more time than expected. Cavities were unstable and can't stay in SELAP . Looking at the waveforms all cavities had 120 Hz component in GMES and PMES.
At this point it had to be the fcc power supply chassis or the power supply for the pre-amplifier possibly causing this. We had seen something similar in 1L03 in the past.

Xavier went to the zones and measured the ripple on the 24 V power supply for multiple zones in SL

2L03
DC value 23.6 V, AC 0.572 V

bachiman

Shift Information

Shift Owl
CEBAF Program
MCC Crew Chief Howard
MCC Operators Deir, Chaudhary, Christian
Program Deputy Nissen
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