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20uA scan with RTP drivers off
IOC MAC address change
StepNGraph error
I was using StepNGraph v3-4 (ops) from JMenu fig 1and during a scan of psub_pl_ipos (rotatable waveplate stepper motor) the app threw the error in fig 2, stopped running.
Tried to abort, did not work.
Pressed Quit, then it aborted and asked to restore values, which I acknowledged, and that worked.
2L25 U-Tubes Complete
COMMENT ON HCO 0R08 BCM electronics
COMMENT ON remove unused fiber/bnc chassis from hall c counting house
APPROVED HCO 0R08 BCM electronics
Program Deputy Summary, presented 2026-02-19
COMMENT ON 1L06 Heat load / Qo assessment
Measurement performed once more, but only tested cav 2 & 5 due to time constraints
More details in the ELog https://logbooks.jlab.org/entry/4471984
Difference is setpoints in Requested Heat & LEM RF Heat,
Allowed Requested Heat to reach setpoint & allowed JT to settle before adjusting LEM RF Heat from 120 --> 80W (arbitrary)
Cavity 2 when turned off had a Low JT of ~76%
Cavity 5 had a Low JT of ~71%
Cav 2 dropped JT by 2% to 5% (typical-ish)
Cav 5 dropped JT by 5% to 8% (unusually high reduction)
Between yesterday's measurement and today's;
Cav 5 seems to be the most problematic cavity
1L06 Heat load / Qo assessment
ATLis https://tasklists.jlab.org/atlis/tasks/119484
Investigating the high heat load in 1L06
Perform same measurement as on Feb 18th 2026 (see linked ELog)
Difference is setpoints in Requested Heat & LEM RF Heat,
Allowed Requested Heat to reach setpoint & allowed JT to settle
before adjusting LEM RF Heat from 120 --> 80W (arbitrary)
Initial JT parameters:
Sample Time = 120
Max Position = 85
Initial Heater parameters:
Requested Heat Watts = 165
LEM Requested RF Heat = 100
STEPS:
1. Reduce ST (JT sample time) to 30s
2. Raise Max Pos to 90%
3. Raise heater 'REQ HEAT WATTS' to 80W
4.
QuickPic - NL Full Survey
QuickPic - SL Full Survey
Operator SIGN IN
SL CHL going to trip
SLinac/FEL SC1R Planned Trip
FSD Masking Tool: Successful Destination masking to: Inj500KeV
COMPLETED Replace MQPAA25 20A SCE
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-19-26
Time : 07:27:54
Day : Thursday
Shift : Day
Crew Chief : Blackshaw
Program Deputy: Buttles
Team : E
Arm : RadCon
Designated SSO: Janak
LERF Operator:
Operators : Janak
This stamp certifies that the above Crew Chief has read/reviewed/received the following:










