Aggregator
MBD5C11H mismatch
arc 9 pathlength (my bad)
Correcting arc 9 path length took longer than it should have because I got the sign for the GOF change wrong. This became clear only when the CC saw the result after the experienced operator steered arc 9 manually. It got much worse instead of better.
ABS=(hardware)-GOF-SOF.
Thus to move the beam out in 1 mm radius to gain Pi mm pathlength to take the dogleg off straight-ahead, GOF = -1.
ATLis Comments Daily Digest
ARC9 X-plane ArcSteer Results
QuickPic - Manual corrector steer of 9A
Steered 8T line to 3C05
QuickPic - GP/PL/GP
Pass 5(H) Separator Issues
While trying to bring these guys up to begin phasing, something with the DSETs seem to be preventing the script from running to completion. DSET values seemingly indefinitely bouncing between two values. We saw this same issue with cavities 1, 2, and 4. Cavity 3, however, tripped in the SlowGlos step of the script on both attempts to bring it up.
dogCalc V0-14 download
Crew Chief Update Regarding 5 Pass H. Cavity Phasing
5th pass horizontal cavities are having issues when they hit the DSET ramp step of their turn on script (more detailed log entry to follow on this issue). I've contacted RF on-call in case this was a quick fix but they weren't sure what the issue was. Since they've been here all day and they shift plans says to only request remote assistance, I've decided to not call them in to fix the issue. Before, we give up completely on the horizontal separators, I wanted to give Software on-call a ring and rule out a software issue.
Operator SIGN IN
Operator SIGN IN
QuickPic - RF Sep. History & Baseline
QuickPic - MQA5A02 mismatch, took setpoint and cycled
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 07-25-26
Time : 15:25:13
Day : Saturday
Shift : Swing
Crew Chief : Blackshaw
Program Deputy: KLarrieu
Team : E
Arm : Anthony
Designated SSO: Shriner
LERF Operator:
Operators : Anthony, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
iocsoftw3spce restored
Downtime Incident CREATED: Restoring CEBAF, 5H separator on/phasing, restore beam to halls
Crew Chief Shift Log, 2026-07-25 DAY
Start of shift: Down for 1L12-5 WGP










