Scalings of energetic particle transport by ion temperature gradient microturbulence

Zhang, Wenlu; Decyk, Viktor; Holod, Ihor; Xiao, Yong; Lin, Zhihong; Chen, Liu

doi:10.1063/1.3379471

Title: Scalings of energetic particle transport by ion temperature gradient microturbulence

Journal Article · 06 May 2010 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.3379471 · OSTI ID:1564693

Zhang, Wenlu ^[1]; Decyk, Viktor ^[2]; Holod, Ihor ^[3]; Xiao, Yong ^[3]; Lin, Zhihong ^[3]; Chen, Liu ^[4]

Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Univ. of Science and Technology of China, Anhui (China). CAS Key Lab of Basic Plasma Physics
Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Zhejiang Univ., Zhejiang (China). Inst. for Fusion Theory and Simulation

Transport scaling of energetic particles by ion temperature gradient microturbulence in magnetized plasmas is studied in massively paralleled gyrokinetic particle-in-cell simulations. Here, it is found that the diffusivity decreases drastically at high particles energy (E) to plasma temperature (T) ratio because of the averaging effects of the large gyroradius and drift-orbit width, and the fast wave-particle decorrelation. At high energy, the diffusivity follows a (E/T)^–1 scaling for purely passing particles, a (E/T)^–2 scaling for deeply trapped particles and a (E/T)^–1 scaling for particles with an isotropic velocity distribution since the diffusivity therein is contributed mostly by the passing particles.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564693

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 17; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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