A Fitting Model for Thermionic Emission at High Electric Fields

Author

Chang, Chieh-Yu ; Lin, Ming-Chieh

Author_Institution

Fu Jen Catholic Univ., Taipei

fYear

2007

Firstpage

164

Lastpage

164

Abstract

Summary form only given. Thermionic emission cathodes are widely used in microwave tubes. In the temperature limited (TL) region, the Richardson-Dushman equation, corrected for the Schottky effect applies. In the fully space charge limited (FSCL) region, the Child-Langmuir law applies. There were many empirical models proposed for fitting the I-V characteristics of thermionic emission cathodes. The self-consistent model has been demonstrated to be a good fit to the I-V characteristics of thermionic emission cathodes at high electric fields by comparing with the experiments performed by Fortgang (2002), giving excellent agreement. Detail analysis and the fitting results is presented.

Keywords

Poisson equation; Schottky effect; microwave tubes; thermionic cathodes; Child-Langmuir law; I-V characteristics; Poisson equation; Richardson-Dushman equation; Schottky effect; fitting model; fully space charge limited region; high electric fields; microwave tubes; temperature limited region; thermionic emission cathodes; Cathodes; Distribution functions; Electron devices; Electron tubes; Laboratories; Poisson equations; Power capacitors; Space charge; Temperature; Thermionic emission;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on

Conference_Location

Albuquerque, NM

ISSN

0730-9244

Print_ISBN

978-1-4244-0915-0

Type

conf

DOI

10.1109/PPPS.2007.4345470

Filename

4345470