Overview of Fabrication Techniques and Lessons Learned With Accelerator Vacuum Windows

TL;DR

This paper reviews fabrication techniques, operational lessons, and safety considerations for vacuum windows used in accelerators, emphasizing design, testing, failure analysis, and lifespan extension methods.

Contribution

It provides a comprehensive overview of vacuum window design, fabrication, testing, failure modes, safety strategies, and strength calculation methods, including FEA, for accelerator applications.

Findings

Failure modes and safety strategies for vacuum windows.

Methods for calculating vacuum window strength, including FEA.

Operational lessons learned from decades of use at Fermilab.

Abstract

Vacuum thin windows have been used in Fermilab's accelerators for decades and typically have been overlooked in terms of their criticality and fragility. Vacuum windows allow beam to pass through while creating a boundary between vacuum and air or high vacuum and low vacuum areas. The design of vacuum windows, including Titanium and Beryllium windows, will be discussed as well as fabrication, testing, and operational concerns. Failure of windows will be reviewed as well as safety approaches to mitigating failures and extending the lifetimes of vacuum windows. Various methods of calculating the strengths of vacuum windows will be explored, including FEA.