ALS BL5.0 photon stop recovery

WEO07
17 Sept 2025, 13:20
20m
The Loop

The Loop

Lund, Sweden
Contributed Oral Presentation Absorbers Accelerators Session 1

Speaker

Will Hutcheson (Lawrence Berkeley National Laboratory)

Description

In June of 2023, the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory, Berkeley, California, United States, experienced a vacuum interlock event that caused a beam dump. Upon investigation, the vacuum technicians discovered a leak in the cooling system of a custom photon stop in Sector 5 (12 total). This paper will detail the event, the temporary restoration of operations, and the process of how a new photon stop was designed, analyzed, fabricated, assembled, tested, qualified, installed and commissioned in a fourteen week window. Over 20 years had passed since the original photon stop was installed in the ALS. Since then, the technology landscape has changed and many of the manufacturing capabilities have lapsed or become extinct not only in the United States, but across international boundaries. This is especially true of brazing. There is a parallel discussion of the causality for the failure which led to the destructive evaluation of the original photon stop. Finally, engineering looked at the thermal fatigue analysis and provided the operation staff with a specific tool to evaluate and maintain the new photon stop.

Funding Agency

This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231

Author

Will Hutcheson (Lawrence Berkeley National Laboratory)

Co-authors

Grant Cutler (Lawrence Berkeley National Laboratory) Lucas Kistulentz (Lawrence Berkeley National Laboratory) Nicolas Wenner (Lawrence Berkeley National Laboratory) Simon Morton (Lawrence Berkeley National Laboratory) Tom Swain (Lawrence Berkeley National Laboratory)

Presentation materials

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