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APPROVED Troubleshoot Hall C LCW readbacks
COMPLETED CEBAF/Halls PSS Certification SAM25
Vacuum Group Summary 2026-05-18
HYST AREA 7-0 Cycles Magnets for eDT
eDT V2-41 Design Setpoints Download - Back on design for Hall C pass change
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 05-18-26
Time : 16:31:55
Day : Monday
Shift : Swing
Crew Chief : Richardson
Program Deputy: Drury
Team : C
Arm : Shriner
Designated SSO: Anthony
LERF Operator:
Operators : Anthony, Shenenberger, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
D orbit as-found after cycling only ArcA box supply. Unlikely to cycle rest of West Arc
Once DC Power finished inspecting the ArcA box supply and handed it back to ops, there was concern from both operations and optics that cycling the entire west arc box supplies and all trims carried a significant risk of completely throwing off orbits and requiring time-consuming re-tuning of the main machine. As a sanity check, cycled only the ArcA box supply twice and checked D beam orbit. Orbit reproduced well up to AE02 (5th pass separator has not been phased yet, so losing beam here is expected), so we will heed the advice of the beam transport experts and resume the Hall C pass change.
PASS5 has been enabled in alarm handler
Hall C Dump LCW Signals
Figure 1: Comparison of the four FSD signals against diagnostic ones (except in the third from the top chart). Figure 2: FSD system. Figures 3-7: LCW commander where the diagnostic signals are gotten from. Figure 8: Hall C Dump Screen: note a mix between FSD signals and diagnostic ones.
Downtime Incident CLOSED: Arc10, SME reported need to shutdown for investigation
Operator SIGN IN
Testing ARC10 Magnet Thermal Interlock Chassis Upon Loss of Communcation
Noticed communication for the new ARC10 Magnet Thermal Interlock Chassis installation was not working. Went out an confirmed the chassis heartbeat was working. Upon futher discussion we asked the crew chief for permission to check the functionality of the chassis. After approval was given we ramped down ARC10 and removed the klixon status connection. The chassis functioned as expected and interlocked ARC10. ARC10 was brought back up and cycled.
- Peirce, Coleman
Operator SIGN IN
Operator SIGN IN
COMMENT ON MPS system maintenance and repairs during physics run
IONTG01 Card Ch#1 tripped leading up to the FSD card issue over the weekend. The card had previously been replaced, but the new card began showing higher noise levels than the original. We replaced it with another spare card, and it is now operating as expected. We will continue to monitor its performance.
Downtime Incident CREATED: Arc10, SME reported need to shutdown for investigation
Hall B & Hall C Pass Change
@ 1400 beam was halted to all halls to prepare for pass change. Halls were brought to Controlled Access
Pass 1 & 2 Separators turned off.
6T transport magnets set on design.
Fig. 3 shows extraction region for B, C, and D. C is on the left being extracted. B and D on the right (same spot) being recirculated.
At shift change left off steering in the 6T region.
iocbd1 restored
COMMENT ON Routine Maintenance of ODH Systems (Managed by SSG).
LERF: OM219 (Lab 6) was reading low and triggered an alarm. We recalibrated the sensor and returned it to service. Since the backup sensor, OM220, is currently bypassed, we staged the portable unit in the lab to provide local alarm and ODH coverage in the event OM219 fails again.”










