  Radio frequency (RF) windows are historically a point where failure occurs in
input-power couplers for accelerators. To understand more about the reliability
of high power RF windows, lifetime testing was done on 700 MHz coaxial RF
windows for the Low Energy Demonstration Accelerator (LEDA) project of the
Accelerator Production of Tritium (APT) program. The RF windows, made by
Marconi Applied Technologies (formerly EEV), were tested at 800 kW for an
extended period of time. Changes in the reflected power, vacuum, air outlet
temperature, and surface temperature were monitored over time. The results of
the life testing are summarized.
