STUDY OF FAILURE MECHANISMS IN HIGH-POWER RADIO-FREQUENCY-GENERATING DEVICES.
Abstract
Electrical test parameters of the traveling-wave tube and their relation to the gas ambient are presented. For tubes incorporating oxide-coated cathodes, decreases in cathode activity are correlated with integrated total and partial pressures in the operating tube. Contributions made by various processed tube components and subassemblies to the gas ambient of the operating vacuum tube are described. The most significant gas sources are the alumina-coated tungsten heater coil as a source of N2 and the kovar or molybdenum anode and plated-tungsten grid, as sources of H2, CO, and hydrogenous gases when plate current is drawn. A hydrogen-firing technique for reducing evolved gases is described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1964
- Accession Number
- AD0608362
Entities
People
- M. Friedman Axler
- R. A. Hein