Eur. Phys. J. D (2014) 68: 371
https://doi.org/10.1140/epjd/e2014-50424-8

Regular Article

Parametric excitation of ion-ion hybrid mode by a lower hybrid wave in a D-T plasma

Department of Applied Sciences and Humanities (Physics Section), Galgotias College of Engineering & Technology, Greater Noida, 201306 Uttar Pradesh, India

^a e-mail: nafis.jmi@gmail.com

Received: 4 June 2014
Received in final form: 14 August 2014
Published online: 11 December 2014

Abstract

Parametric excitation of ion-ion hybrid mode by a large amplitude lower hybrid wave in a two ion species D-T plasma is investigated. The sideband lower hybrid wave, generated in the nonlinear coupling process, beats with the pump to exert a parallel ponderomotive force on electrons driving the low frequency mode. The density perturbation associated with the latter couples with the E × B drift due to the pump to produce a nonlinear current driving the sideband. The ion-ion hybrid mode frequency in a 50:50 D-T plasma is close to geometric mean of deuterium and tritium cyclotron frequencies. The growth rate increases with the wave number of the mode. It also increases with the increase in the ratio of deuterium to tritium density.