Finite-element simulation of thermoemission electron guns

D. Greenfield

doi:10.1117/12.693187

31 May 2006 Finite-element simulation of thermoemission electron guns

D. Greenfield

Proceedings Volume 6278, Seventh Seminar on Problems of Theoretical and Applied Electron and Ion Optics; 627805 (2006) https://doi.org/10.1117/12.693187
Event: Seventh Seminar on Problems of Theoretical and Applied Electron and Ion Optics, 2005, Moscow, Russian Federation

Abstract

The peculiarity of the numeric simulation of the thermoemission electron guns consists in the principal necessity of taking into account the contribution of the electrons' charge into the potential distribution in the beam formation region. Ths fact makes the mathematical model essentially nonlinear especially in the high-perveance operation mode. Moreover, the charge density is extremely high in the vicinity of emitting surfaces, rising infinitely in the limit of zero initial velocities. A special semi-analytical approach has been applied to deal with the charge singularity. Being combined with traditional finite-element numerical techniques, this approach provides an efficient way to simulate thermoemission electron guns.

Citation Download Citation

D. Greenfield "Finite-element simulation of thermoemission electron guns", Proc. SPIE 6278, Seventh Seminar on Problems of Theoretical and Applied Electron and Ion Optics, 627805 (31 May 2006); https://doi.org/10.1117/12.693187

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