Transient growth in stable collisionless plasma

Details Transient growth in stable collisionless plasma Transient growth in stable collisionless plasma

2009-02-15

arxiv.org/abs/0902.2551v1

Phys. Plasmas 16, 030703 (2009)

Physics

Plasma Physics

accepted as a Letter in Physics of Plasmas

Scientific paper

10.1063/1.3094759

The first kinetic study of transient growth for a collisionless homogeneous Maxwellian plasma in a uniform magnetic field is presented. A system which is linearly stable may display transient growth if the linear operator describing its evolution is non-normal, so that its eigenvectors are non-orthogonal. In order to include plasma kinetic effects a Landau fluid model is employed. The linear operator of the model is shown to be non-normal and the results suggest that the nonnormality of a collisionless plasma is intrinsically related to its kinetic nature, with the transient growth being more accentuated for smaller scales and higher plasma beta. The results based on linear spectral theory have been confirmed with nonlinear simulations.

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