Variation of anode grid surface morphology and its effect on operation of a triode virtual cathode oscillator.
Rev Sci Instrum
; 83(10): 103304, 2012 Oct.
Article
en En
| MEDLINE
| ID: mdl-23126760
ABSTRACT
After repeatedly operation of a triode virtual cathode oscillator, the surface morphology of anode grid is studied by a scanning electron microscope. It is found that there are many quasi-periodic sawteeth formed on the anode grid, which are about 300-500 µm in height, ~200 µm in width, and 150-200 µm in period. The formation of this sawteeth implies that there is possible Rayleigh-Taylor-like instability on the anode grid during the irradiation by high-current relativistic electron beam. These sawteeth enhance the electric field on anode grid, leading to more feasible of anode plasma generation, and more rapidly expansion of that plasma. As a result, the electron transmissivity of anode grid is decreased, the output microwave power of the virtual cathode oscillator is lowered and its operational performance is degraded.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Rev Sci Instrum
Año:
2012
Tipo del documento:
Article
País de afiliación:
China