STUDIES OF ELECTRON TUBE MATERIALS AND THERMIONIC EMISSION PROCESSES
Abstract
The development of a diode to study oxide cathodes in a high-purity ambient was continued. The dynamics of gas evolution during processing of an oxide cathode and the sources of the several gas components present in an operating diode were studied by techniques involving omegatron mass spectrometers. Studies will determine adequate processing methods and establish the reproducibility of the diodes used for thermionic emission measurements. The work was carried out with diodes having oxide-coated platinum-based cathodes and platinum anodes. Efforts were also directed toward the conception of a theoretical basis which would permit reconciliation of all the phenomena observed during the investigations with barium-coated polycrystalline nickel. An anti-parallactic, smallaperture photometer probe with an automatic adapter to accommodate varying tube screen curvatures was developed for measuring discrete values from the screen pattern. A 21-inch face dummy tube, containing all the essential and critical features of the final microscope tubes, was successfully heat-processed in the oven which was built to process sealed-off-type microscope tubes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 05, 1961
- Accession Number
- AD0257997