Initial testing results of scandia-doped tungsten dispenser cathodes

Abstract

Spectra-Mat, Inc has developed a kilogram-scalable process for manufacturing scandia-doped tungsten powder for tungsten matrices for high current density cathodes. To validate the powder, diode testing has been performed, with multiple cathodes from a single lot and multiple powder lots. Performance results of that testing as well as initial life test data will be presented. Cathodes are consistently providing 5 A/cm ² at or below 860°C.