Aggregator
CIS on-call: weekly summary
Quiet week, no calls, few emergent issues.
Photocathode and laser health:
Figure 1: QE measurements. Reason for jumps unclear, could be related to x/y stage reproducibility (performed QE scan w/ homing) and/or unexplained motion of the laser itself.
Figure 2: extinction ratio data, no values below 1000, unremarkable.
Beam studies and laser table measurements:
- BSList #118932: measured BPM spectrum at IPM0L03 as a function of time, hoping to see a correlation with BCM heater jacket.
TMG waveform scope missing beam sync
The errors in the TMG waveform measurement are a result of the scope not getting beam sync triggers.
Figure 1: blue trace showing constant 5 V on beam sync input.
So the cable is connected, but the distribution chassis isn't sending me any pulses. I will come back with a scope later today and trace the signal.
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-25-26
Time : 09:32:30
Day : Wednesday
Shift : Day
Crew Chief : Humphry
Program Deputy: Buttles
Team : X
Arm : RadCon
Designated SSO: Thomas
LERF Operator:
Operators : Thomas
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
APPROVED Perform PM service for the counting house CRU's
COMMENT ON Perform PM service for the counting house CRU's
How to go back to UVA RTP HV Driver
Since the UVA RTP HV Driver is the hot spare, these are the instructions on how to back-out of JLab RTP HV Driver installation and go back to the UVA driver:
1. Turn off the JLab RTP Driver from the control screen and unplug the power from the front of the driver boxes.
2. Disconnect the JLab HV Driver cables to the RTP crystals. These are 6 cables.
3. Reconnect RTP crystals cables to UVA driver. These are 5 cables - UVA has only one common ground cable labeled "33".
4. Unplug Hel Flip fiber from JLab driver and send it back to the IA driver instead of the nHel Flip fiber.
COMMENT ON Perform PM service for the counting house CRU's
Forgive my ignorance, what is a CRU?
What spaces will be affected -- just Hall A, B, C counting house control rooms, one at a time? Additional areas?
What's the estimate for how long a single outage will take?
With answers to the above, only remaining item is to ensure Hall work coordinators also approve.
QuickPic - NL Full Survey
APPROVED Chassis removal SL02B12
Starting Beam studies up to 1D
Autolog save
Program Deputy Summary, presented 2026-02-25
FSD Masking Tool: Successful Destination masking to: Inj500KeV
QuickPic - Closed VBV1L25A/B and VBV1L26A/B for DP work
COMPLETED Startup of Two Additional Central Chilled Water System Chillers and Associated Primary and Secondary Pumps and Final Commissioning
iochdmag restored
QuickPic - SL Full Survey
Operator SIGN IN
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-25-26
Time : 07:22:48
Day : Wednesday
Shift : Day
Crew Chief : Mock
Program Deputy: Buttles
Team : B
Arm : RADCON
Designated SSO: Thomas
LERF Operator:
Operators : Thomas
This stamp certifies that the above Crew Chief has read/reviewed/received the following:










