Multivariate regression methods for crossed-field amplifiers analyzing tube performance at final test and cathode quality

Cathode technology for Crossed-Field Amplifiers (CFAs) has progressed from hot oxide types such as oxide powders, cermets, and dispensers, to cold secondary emitter types, such as Platinum and Beryllium. However, some production designs still require the usage of the hot oxide cathodes. This is due to costly on-going development and lack of availability of special cold-type cathode materials needed for these certain product lines. Unfortunately, several oxide powders that have been used for years are no longer produced, forcing engineers to explore other oxide powder combinations. Also, the nature of the hot oxide cathode manufacturing process allows for a margin of cathode variability, ultimately leading to finished device test variability and short cathode life in the field.