Sherwood 2015

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approvedsherwood__bao_jian.pdf2015-01-18 15:46:58Jian Bao

Global particle simulation of lower hybrid wave propagation and mode conversion in tokamaks

Author: Jian Bao
Requested Type: Consider for Invited
Submitted: 2015-01-18 15:42:32

Co-authors: Zhihong Lin, Animesh Kuley

Contact Info:
Peking University
541 room Physics School, Pekin
Beijing, Non-US   100871
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Abstract Text:
Global particle simulations of the lower hybrid (LH) waves have been carried out by using the fully kinetic ion/ drift kinetic electron model with a realistic electron-to-ion mass ratio. Linear simulation of the propagation of a LH wave-packet in the toroidal geometry shows that the wave propagates faster in the high field side than the low field side, in agreement with a ray tracing calculation [1]. With LH waves propagating towards the plasma center from the edge, the poloidal spectrum of the wave-packet broadens and the central poloidal number increases (Figs.1a-1b). Furthermore, an electromagnetic fluid-kinetic model is introduced to study the accessibility of LH waves with low numerical noise, in which electron density is pushed forward by the continuity equation, and the kinetic markers are introduced for closure. The mode-conversions between slow and fast waves are observed in both cylinder and toroidal geometries, which are consistent with the theory (Fig. 1c). LH wave propagation with launching from high field side is also studied by using particle simulation model. The nonlinear simulation of LH wave current driven is also carried out with the electromagnetic model, in which nonlinear particle trapping effect is observed and the bounce frequency agrees with the theory.

Comments:

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