Mechanical reliability of current alumina and beryllia ceramics used in microwave windows for gyrotrons
- 1 February 1983
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
The mechanical reliability was evaluated for the alumina and beryllia ceramics now used as microwave windows in the high-power (greater than or equal to 200 kW) high-frequency (greater than or equal to 60 GHz) gyrotron tubes being developed for plasma heating in fusion systems. Analysis of the stresses generated in the various window configurations and tube operating conditions indicated that significant tensile stresses are generated in the ceramic window by dielectric heating. As a result, we characterized the static and dynamic fatigue behavior and the inert strength distributions for these two ceramics (i.e., fatigue studies included the behavior in the fluorocarbon fluid used for window cooling at 22 and 48/sup 0/C and in both air (65% relative humidity) and distilled water at 22/sup 0/C. These data were then analyzed in order to construct reliability diagrams for these materials.Keywords
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