Transport of Energetic Particles by Microturbulence in Magnetized Plasmas

Wenlu Zhang (张文禄), Zhihong Lin (林志宏), and Liu Chen (陈骝)

Phys. Rev. Lett. 101, 095001 – Published 27 August 2008

Abstract

Transport of energetic particles by the microturbulence in magnetized plasmas is studied in gyrokinetic simulations of the ion temperature gradient turbulence. The probability density function of the ion radial excursion is found to be very close to a Gaussian, indicating a diffusive transport process. The particle diffusivity can thus be calculated from a random walk model. The diffusivity is found to decrease drastically for high energy particles due to the averaging effects of the large gyroradius and orbit width, and the fast decorrelation of the energetic particles with the waves.

Received 20 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.095001

Authors & Affiliations

Wenlu Zhang (张文禄)^1,2,*, Zhihong Lin (林志宏)¹, and Liu Chen (陈骝)^1,3

¹Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
²CAS Key Laboratory of Basic Plasma Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
³Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, Zhejiang 310058, China

^*wenluz@uci.edu

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Issue

Vol. 101, Iss. 9 — 29 August 2008

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