Commun. Comput. Phys.,
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Volume 4.


AWECS: A Linear Gyrokinetic delta-f Particle-in-Cell Simulation Code for the Study of Alfvenic Instabilities in High-Beta Tokamak Plasmas

A. Bierwage 1*, L. Chen 2

1 Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.
2 Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA; and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China.

Received 10 November 2007; Accepted (in revised version) 28 December 2007
Available online 14 April 2008

Abstract

A 1-D linear gyrokinetic code called AWECS is developed to study the kinetic excitation of Alfvenic instabilities in a high-beta tokamak plasma, with beta being the ratio of thermal to magnetic pressure. It is designed to describe physics associated with a broad range of frequencies and wavelengths. For example, AWECS is capable of simulating kinetic ballooning modes, Alfvenic ion-temperature-gradient-driven modes, as well as Alfven instabilities due to energetic particles. In addition, AWECS may be used to study drift-Alfven instabilities in the low-beta regime. Here, the layout of the code and the numerical methods used are described. AWECS is benchmarked against other codes and a convergence study is carried out.


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PACS: 52.65.Tt, 52.55.Fa, 52.35.-g, 52.55.Pi
Key words: Linear gyrokinetic simulation, tokamak plasma, drift-Alfven waves, shear Alfven waves, energetic particles.

*Corresponding author.
Email: abierwag@uci.edu (A. Bierwage), liuchen@uci.edu (L. Chen)
 

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