Accession Number : AD0284678

Title :   DISCHARGE EFFECTS IN A CESIUM DIODE

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : COGGINS,JAMES LAWSON

Report Date : 15 AUG 1962

Pagination or Media Count : 1

Abstract : The feasibility of neutralizing the electron space charge in a cesium thermionic converter with ions formed by the collisions of electrons with neutral atoms was investigated. Equations were set up for the ion density and subsequent potential function for a low-pressure plasma in which the ions are formed by collisions of atoms with electrons emitted from the cathode with a Maxwellian velocity distribution. The special case of zero field at he emitter was taken to simplify the mathematics. Voltage-versus-current characteristics were determined experimentally for a cesium diode with a low work-function impregnated tungsten emitter operating at 1410 K and an electrode spacing of 0.254 cm. Cesium vapor pressures corresponding to condensation temperatures of 30 C, 100 C, and 155 C were used. The results indicated that higher cesium pressures, leading to more dense plasmas and successive collisions between electrons and excited atoms, are needed for complete spacecharge neutralization. (Author)

Descriptors :   *DIODES, *SPACE CHARGE, *THERMIONIC EMISSION, ANODES, ATOMS, CATHODES, CESIUM, ELECTRONS, IONIZATION, IONS, THERMIONIC CONVERTERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE