Aggregator

Follow-up Re: Downtime Incident CREATED: 0L03-4 No Forward Power

14 hours 58 minutes ago
Log Number: 4487081Logbook(s): Body: 

Cavity #3 Klystron lost cathode current at recovery of the Injector after a controlled access. KMAV displayed a 0.700 Vdc reading when 0 Volts was requested. 0.700 Vdc on the Mod Anode should not have caused the drastic reduction in cathode current from ~ 1.2 A. to 0.23 A. Cathode current recovered to 1.21 A. after Filament Voltage was raised from 5.9 to 7.9 Vdc. It took about ~26 minutes for the cathode current to recover to the former value. This voltage increase should not cause any issues unless the Klystron has been damaged internally.

holben

rayTrace Data Collection: MHB0L04H to SDL0R08 - X plane - Successful run for x plane in injector.

15 hours 14 minutes ago
Log Number: 4487073Logbook(s): Body: username = ryanmb, hostname = opsl07, CSUE version = 1-23
login_key = pro, workspace = OPS

Data collection parameters:
corr2_s = 36.4081755003566
input_momentum = 6.73999802152278
launch_s = 46.3751795003566
corr2_initial_bdl = 10.5
alpha = -1.307436551712937
emit = 1.413382274777768E-08
start_element = MHB0L04H
config_file = /a/opsdata/fiefdata/fileio/r/rayTrace_12GeV/config/F1-0/10Turns/IPM0L06_to_ILD_x_10turn.xml
max_orbit = 1.5
corr2_momentum = 32.5053162270802
measure_dwell = 50
start_pass = 1
ryanmb

2L03-3 KBCU fault

15 hours 20 minutes ago
Log Number: 4487070Logbook(s): Entry Makers: kernsBody: 

Fault is indicated when there is no KCCU output. This is caused be no filament heaters. Replaceing the filament board to correct will require lockout of CPS to get into the HPA cabinet and also SRPD while HPA is open during beam operation.

kerns

COMMENT ON RF Maintenance and Repairs for Physics Run 2026

15 hours 24 minutes ago
Log Number: 4487069Logbook(s): Body: 

Worked on a list of 24 legacy zone cavities that have problems and either GSET 0 or bypassed that will require beam permit time to troubleshoot RF problems before the 4 Gev beam run. With the beam jitter testing this weekend, seven cavities have been turned off this weekend and today and the list seems to be growing rapidly while maintenance time is nil. Plans need to be discussed soon 2L11-8 comm's problem and two about 6 zones in the South were cable checked but that and 2L03 transformer install work is about all we could do with the machine without beam interruption and testing.

kerns

Operator SIGN IN

15 hours 57 minutes ago
Log Number: 4487061Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Schaumloffel
DATE:             04/13/2026
SHIFT:               Swing

The operator has read the following:
bschauml

Operator SIGN IN

16 hours 7 minutes ago
Log Number: 4487059Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             04/13/2026
SHIFT:               Swing

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

MBC9S06H Mismatch

16 hours 38 minutes ago
Log Number: 4487053Logbook(s): Entry Makers: bjacobBody: 

Took set point and cycled without issue. It is the 3rd time it has done this in the last couple of hours. Likely needs a trim card swap.

bjacob

rayTrace Data Collection: MHB0L04H to SDL0R08 - X plane - ABORTED - Aborted due to beam loss. Noticed after two full turns.

16 hours 42 minutes ago
Log Number: 4487051Logbook(s): Body: username = ryanmb, hostname = opsl07, CSUE version = 1-23
login_key = pro, workspace = OPS

Data collection parameters:
corr2_s = 36.4081755003566
input_momentum = 6.73999802152278
launch_s = 46.3751795003566
corr2_initial_bdl = 10.5
alpha = -1.307436551712937
emit = 1.413382274777768E-08
start_element = MHB0L04H
config_file = /a/opsdata/fiefdata/fileio/r/rayTrace_12GeV/config/F1-0/10Turns/IPM0L06_to_ILD_x_10turn.xml
max_orbit = 1.5
corr2_momentum = 32.5053162270802
measure_dwell = 50
start_pass = 1
ryanmb

CREW CHIEF SIGN IN

16 hours 46 minutes ago
Log Number: 4487047Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 04-13-26
Time : 15:27:42
Day : Monday
Shift : Swing

Crew Chief : Forman
Program Deputy: Ogur
Team : F
Arm : Yoon
Designated SSO: Schaumloffel
LERF Operator:
Operators : Schaumloffel, Yoon

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

Shift Information

Shift Day
CEBAF Program
MCC Crew Chief Humphry
MCC Operators Blackshaw, Janak
Program Deputy Ogur
Announcements

Access Status

Recent PSS History

recent pss history graph