STUDIES OF PRIMARY ELECTRON SOURCES
Abstract
A tube structure designed to expose an oxide cathode to a controlled partial pressure of an alkaline-earth metal vapor is described and results obtained from the first tube are presented. Photoelectric yield measure are presented which illustrate the effect of the environment on the yield from a BaO coating. The system used for the simultaneous determination of the photoelectric and thermionic emission energy distributions from BaO is presented and described in detail. Measurements of the thermionic emission energy distribution are presented and these distributions are used in an evaluation of the analyzer system. Thermionic energy distributions are presented which provide evidence for a coating potential drop while drawing dc current from the coating and a measure of the potential profile of the coating is derived from these distributions. Results of a further study of the dependence of thermionic pulse emission, conductivity, and Sr evolution on the oxide thickness are presented for a tube which operated for only a limited time. Methods of formation of insulating films for thin film tunnel current devices are discussed. A12O3 was anodically formed using four electrolytic solutions, and 4 types of heat treatment were used.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1963
- Accession Number
- AD0406054
Entities
People
- D. E. Anderson
- W. G. Shepherd
Organizations
- University of Minnesota