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Plasma cavity formation caused by ion acoustic waves and nonlinear modulation of trapped waves

Published online by Cambridge University Press:  01 April 1999

T. HONZAWA ,
S. WATANABE  and
Y. SAITOU
T. HONZAWA
Affiliation:
Department of Electric and Electronic Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan
S. WATANABE
Affiliation:
Department of Electric and Electronic Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan
Y. SAITOU
Affiliation:
Department of Electric and Electronic Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan
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Abstract

Externally amplitude-modulated ion acoustic waves with high frequencies of 200–320 kHz are experimentally shown to form plasma cavities and to be trapped in them at an early stage. Thereafter, the trapped waves are observed to suffer nonlinear modulation and create new lower-frequency waves with average frequencies as low as 20–40 kHz within the cavities. As a result, the externally excited high-frequency ion acoustic waves are found to be nonlinearly converted into lower-frequency ion waves in the cavities. Finally, the pressure gradients of the waves effective in cavity formation and nonlinear modulation of the trapped waves are discussed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 61 , Issue 3 , April 1999 , pp. 489 - 505
Copyright
1999 Cambridge University Press

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