EFFECT OF SCHOTTKY EMISSION ON THERMIONIC CONVERTER CURRENTS IN IGNITED MODE
Abstract
A theoretical model of a cesium thermionic converter operating in the ignited mode is investigated to determine the possible role of Schottky emission produced by the accelerating field of an ion rich emitter sheath in causing the high currents observed in that mode. The electric field intensity adjacent to the emitter is determined as a function of plasma density, electron temperature, and emitter sheath potential by integration of Poisson's equation between sheath edge and emitter. The interelectrode plasma is considerated to be uniform. Simultaneous solution of relationships permits generation of currentvoltage characteristics. The Schottky effect is a substantial contributing factor in the production of observed high currents. The present analysis yields currents which saturate with reduced load voltage in contrast to the behavior of experimental characteristics. This strongly suggests the operation of other mechanisms, in addition to the Schottky effect, which produce a reduction of work function with reduction of load voltage. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1962
- Accession Number
- AD0288092
Entities
People
- G.l. Johnston