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Title: Theory of energetic alpha-particle-driven Alfven wave turbulence

Abstract

A theory of energetic alpha-particle-driven Alfven wave turbulence is presented. Attention is focused on the nonlinear saturation of turbulence through bulk ion Compton scattering. It is found that the ion Compton scattering, while conserving total fluctuation energy, induces a nonlinear spectral shift away from linear alpha particle growth rate toward higher poloidal wave number {ital k}{sub {theta}}, thus reducing the power transfer between the energetic alpha particles and the Alfven wave turbulence. Saturation is obtained when this reduced alpha-Alfven wave power transfer is balanced by the linear electron Landau damping. The saturation level of turbulence and turbulent particle transports for both energetic alphas and bulk plasmas are calculated. The implications of these results on the alpha particle and bulk plasma confinement are discussed.

Authors:
 [1]
  1. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
7008897
DOE Contract Number:  
FG02-91ER54109
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (United States)
Additional Journal Information:
Journal Volume: 4:10; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; ALPHA PARTICLES; TURBULENCE; COMPTON EFFECT; FUSION YIELD; LANDAU DAMPING; PLASMA CONFINEMENT; SPECTRAL SHIFT; TRANSPORT THEORY; BASIC INTERACTIONS; CHARGED PARTICLES; CONFINEMENT; DAMPING; ELASTIC SCATTERING; ELECTROMAGNETIC INTERACTIONS; HYDROMAGNETIC WAVES; INTERACTIONS; NUCLEAR REACTION YIELD; SCATTERING; YIELDS; 700340* - Plasma Waves, Oscillations, & Instabilities- (1992-)

Citation Formats

Gang, F. Theory of energetic alpha-particle-driven Alfven wave turbulence. United States: N. p., 1992. Web. doi:10.1063/1.860423.
Gang, F. Theory of energetic alpha-particle-driven Alfven wave turbulence. United States. https://doi.org/10.1063/1.860423
Gang, F. 1992. "Theory of energetic alpha-particle-driven Alfven wave turbulence". United States. https://doi.org/10.1063/1.860423.
@article{osti_7008897,
title = {Theory of energetic alpha-particle-driven Alfven wave turbulence},
author = {Gang, F},
abstractNote = {A theory of energetic alpha-particle-driven Alfven wave turbulence is presented. Attention is focused on the nonlinear saturation of turbulence through bulk ion Compton scattering. It is found that the ion Compton scattering, while conserving total fluctuation energy, induces a nonlinear spectral shift away from linear alpha particle growth rate toward higher poloidal wave number {ital k}{sub {theta}}, thus reducing the power transfer between the energetic alpha particles and the Alfven wave turbulence. Saturation is obtained when this reduced alpha-Alfven wave power transfer is balanced by the linear electron Landau damping. The saturation level of turbulence and turbulent particle transports for both energetic alphas and bulk plasmas are calculated. The implications of these results on the alpha particle and bulk plasma confinement are discussed.},
doi = {10.1063/1.860423},
url = {https://www.osti.gov/biblio/7008897}, journal = {Physics of Fluids B; (United States)},
issn = {0899-8221},
number = ,
volume = 4:10,
place = {United States},
year = {1992},
month = {10}
}