Non-adequacy of thermal-gap numerical calculation for high power electron beam devices

P. I. Akimov; P. V. Nevsky; V. A. Syrovoy

doi:10.1117/12.804382

5 June 2008 Non-adequacy of thermal-gap numerical calculation for high power electron beam devices

P. I. Akimov, P. V. Nevsky, V. A. Syrovoy

Proceedings Volume 7121, Eighth Seminar on Problems of Theoretical and Applied Electron and Ion Optics; 71210F (2008) https://doi.org/10.1117/12.804382
Event: Eighth Seminar on Problems of Theoretical and Applied Electron and Ion Optics, 2007, Moscow, Russian Federation

Abstract

It is shown that numerical algorithms for region near cathode and thermal gap are non-adequate to usual hydrodynamical beam model under Ρ - and Τ - regime of emission with zero start velocity. This is the reason of non-trustworthiness for beam calculations in case of linear compression L ≥ 20. The method is formulated which may eliminate disbalance between theoretical beam model and its numerical realization. In the most contemporary devices with dense electron beams the thermocathodes are used as source of electrons. Two important problems demand their solution in this case: design and technology for cathode heater with thermal gap between cathode and focusing electrode; design of electron-optical system for electron beam needed parameters. This article is devoted to discussion of numerical results in region near cathode edge. These results are obtained thanks to trajectory analysis programs which use the hydrodynamical beam model and Ρ - or Τ - regime of emission for space-charge-flow with zero start velocity. The discussion is continuation of adequacy and accuracy investigations for numerical models of dense electron beams.

Citation Download Citation

P. I. Akimov, P. V. Nevsky, and V. A. Syrovoy "Non-adequacy of thermal-gap numerical calculation for high power electron beam devices", Proc. SPIE 7121, Eighth Seminar on Problems of Theoretical and Applied Electron and Ion Optics, 71210F (5 June 2008); https://doi.org/10.1117/12.804382

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KEYWORDS

Electrodes

Electron beams

Thermal modeling

Spherical lenses

Magnetism

Systems modeling

Electron transport

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