Temporal growth of filamentation instability in plasmas

Journal Article · Tue Jan 31 23:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324686· OSTI ID:5165787

Sodha, M S; Sharma, J K; Sharma, R P; Kaushik, S C

In this paper we have derived an expression for the growth rate of filamentation instability, valid for arbitrary intensity of the electromagnetic wave and upto plasma resonance (..omega../sub p/> or =..omega../sub 0/ here ..omega../sub p/ and ..omega../sub 0/ are the field free plasma frequency and EM wave frequency respectively). In a collisionless plasma and on the short time scale (ttau/sub epsilon/, tau/sub epsilon/ being the energy relaxation time) in a collisional plasma, the nonlinearity arises on account of pondermotive force and consequent depletion of electrons in regions of large wave amplitude. On the time scale of energy relaxation time in a collisional plasma, the dominant nonlinearity arises on account of preferential heating electrons. It is found that (i) maximum growth rate attains it's maximum for an optimum intensity of the beam (ii) filamentation is predicted in the over dense plasmas (..omega../sub p/>..omega../sub 0/).

• Research Organization: Department of Physics, Indian Institute of Technology, New Delhi-110029, India
• OSTI ID: 5165787
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
COLLISIONAL PLASMA
COLLISIONLESS PLASMA
ELECTROMAGNETIC RADIATION
INSTABILITY
INSTABILITY GROWTH RATES
PARAMETRIC INSTABILITIES
PERMITTIVITY
PLASMA
PLASMA FILAMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATIONS