Emission models for thermionic cathodes

David C. Carpenter; John Simkin

doi:10.1117/12.279397

25 September 1997 Emission models for thermionic cathodes

David C. Carpenter, John Simkin

Proceedings Volume 3155, Charged Particle Optics III; (1997) https://doi.org/10.1117/12.279397
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Accurate computer simulations of electron guns based on finite element methods for electrostatic field calculation are described. Discrete and semi analytic models for thermionic cathode emission currents are presented, the initial conditions used for the electrons at the cathode are discussed and the affects of different approximations are analyzed for an axisymmetric triode electron gun. Results from models that use local one dimensional approximations are compared to a full discrete simulation.

Citation Download Citation

David C. Carpenter and John Simkin "Emission models for thermionic cathodes", Proc. SPIE 3155, Charged Particle Optics III, (25 September 1997); https://doi.org/10.1117/12.279397

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