  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.
