Thermionic emission with allowance for individual ion fields
Abstract
Averaging of thermionicemission current density is carried out in terms of the distribution function of corrections to output energy for large values of the dimensionless parameter h. The effect of ioncharge discreteness on currentdensity calculations for plasma accelerators, MHD generators, plasmatrons, and thermionic converters is investigated. It is shown that ioncharge discreteness has little effect at small average cathodeelectricfield intensities, but that the effect becomes substantial at higher intensities and leads to a significant increase in the current density of electron emission. It is concluded that the effect of ioncharge discreteness may be neglected in firstapproximation calculations for thermionic converters, but must be taken into account in calculations for plasma accelerators, plasmatrons, and MHD generators.
 Publication:

Zhurnal Tekhnicheskoi Fiziki
 Pub Date:
 June 1976
 Bibcode:
 1976ZhTFi..46.1356P
 Keywords:

 Current Density;
 Electric Potential;
 Ion Charge;
 Thermionic Cathodes;
 Thermionic Emission;
 Charge Distribution;
 Hot Cathodes;
 Magnetohydrodynamic Generators;
 Plasma Accelerators;
 Plasmatrons;
 Poisson Equation;
 Probability Density Functions;
 Temperature Distribution;
 Thermionic Power Generation;
 Work Functions;
 Plasma Physics