Title :
A Fitting Model for Thermionic Emission at High Electric Fields
Author :
Chang, Chieh-Yu ; Lin, Ming-Chieh
Author_Institution :
Fu Jen Catholic Univ., Taipei
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;
Conference_Titel :
Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0915-0
DOI :
10.1109/PPPS.2007.4345470
