STUDIES OF PRIMARY ELECTRON SOURCES
MINNESOTA UNIV MINNEAPOLIS ELECTRON TUBE RESEARCH LAB
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A new structure for chemically reducing BaSrO cathodes using carbon is described. An analysis of thermal 6hanges in cathodes under long pulse current drain, and computer solutions to the equations resulting from the analysis, are presentedandthe problem of cathode sparking is discussed in terms of the indicated thermal instability. Further studies of the dependence of cathode properties of coating thickness and of photoemission from BaO are presented. Preparation of thin oxide films on vacuum-deposited Al and Be layers by reaction with an oxide atmosphere, and of MgO films by ion sputtering in an inert gas discharge, is described. The sputtering technique is also applied to produce Ta films as substrate materials. A system for monitoring the complex impedance of tunnel devices as a function of time and of dc bias is described.
- Electricity and Magnetism