Sherwood 2015

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Frequency chirping structures in the line-broadened quasilinear model

Author: Vinicius N. Duarte
Requested Type: Poster Only
Submitted: 2015-01-16 17:11:29

Co-authors: H. L. Berk, N. N. Gorelenkov

Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, NJ   08540

Abstract Text:
The line-broadened quasilinear (LBQ) theory is a model that employs standard quasilinear equations, introducing a diffusion coefficient that scales with the relevant inverse time scales of interest, such as the bounce frequency, the growth rate and the collisional frequency. LBQ can be thought as a reduced model that presents the advantage of being able to treat both regimes of isolated and overlapping modes, as opposed to the usual quasilinear description, which requires enough degree of stochasticity (Chirikov criterion). In this presentation we describe ongoing efforts aimed at extending LBQ to capture nonlinear coherent structures, such as phase space holes and clumps. We are attempting to model chirping in LBQ. Progress in this effort will be discussed.


March 16-18, 2015
The Courant Institute, New York University