Non-modal stability analysis and transient growth in a magnetized Vlasov plasma

V. Ratushnaya, Ravi Samtaney

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Collisionless plasmas, such as those encountered in tokamaks, exhibit a rich variety of instabilities. The physical origin, triggering mechanisms and fundamental understanding of many plasma instabilities, however, are still open problems. We investigate the stability properties of a 3-dimensional collisionless Vlasov plasma in a stationary homogeneous magnetic field. We narrow the scope of our investigation to the case of Maxwellian plasma and examine its evolution with an electrostatic approximation. For the first time using a fully kinetic approach we show the emergence of the local instability, a transient growth, followed by classical Landau damping in a stable magnetized plasma. We show that the linearized Vlasov operator is non-normal leading to the algebraic growth of the perturbations using non-modal stability theory. The typical time scales of the obtained instabilities are of the order of several plasma periods. The first-order distribution function and the corresponding electric field are calculated and the dependence on the magnetic field and perturbation parameters is studied. Our results offer a new scenario of the emergence and development of plasma instabilities on the kinetic scale.
Original languageEnglish (US)
Pages (from-to)55001
JournalEPL (Europhysics Letters)
Volume108
Issue number5
DOIs
StatePublished - Dec 15 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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