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ALFVEN WAVES IN THE PRESENCE OF ALPHA PARTICLES--STABILITY, HEATING AND CURRENT DRIVE.

机译：出现阿尔法颗粒-稳定性，加热和电流驱动

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摘要

The stability of both Global Alfven eigenmodes and Kinetic Alfven Waves in the presence of energetic Alpha particles produced in the fusion reactions, is studied analytically and numerically. The basic eigenmode equations describing the responses of electrons, thermal ions, and Alpha particles driven by Alfven wave perturbations are constructed using a linearized kinetic model in cylindrical geometry.;Both Global Alfven Eigenmodes and Kinetic Alfven Waves, with small parallel wave numbers, are found to be unstable to the plasma parameters relevant to the later phase operation of T.F.T.R.Tokamak. Global Alfven Eigenmode with toroidal model and poloidal mode numbers (1,m) = (0,-2) is identified as the most dangerous mode, remains unstable for fairly broad range of possible Alpha particle distributions. The growth rates of Kinetic Alfven Waves are fairly sensitive to the models used for finite gyroradius effect of Alpha particles and are easily stabilized by either broadening the radial distribution or lowering the temperature of the Alpha particles.;The problems of heating and current drive using Compressional Alfven Waves are then examined. The Alpha particles interact strongly with the Compressional Alfven Waves with phase velocities closed to the thermal velocities of the Alpha particles, via transit time magnetic pumping, resulting substantial energy absorption by Alpha particles. The usual current drive scheme using low phase velocity Compressional Alfven Waves cannot avoid this Alpha particle absorption. A high phase velocity current drive scheme using Compressional Waves with K(,(theta)) k(,(zeta)) (k(,(theta)) and k(,(zeta)) are the poloidal and toroidal wave numbers), is proposed and the new scheme can avoid both Alpha particle absorption and edge heating due to Alfven resonance absorption.;The model includes important kinetic effects such as finite elec- tron mass and finite ion gyroradius, which lead to Landau damping and formation of Kinetic Alfven Waves inside the Alfven continuum. In addition, equilibrium current density gradient, magnetic shear and finite (omega)/(omega)(,ci) effects are incorporated, providing the conditions for the formation of Global Alfven Eigenmodes below the Alfven continuum. The response of the Alpha particles is manifested as additional perturbed current due to the large equilibrium drifts of the particles.
机译：分析和数值研究了在融合反应中产生的高能Alpha粒子存在下，整体Alfven本征模式和动力学Alfven波的稳定性。使用圆柱几何中的线性动力学模型构建描述由Alfven波扰动驱动的电子，热离子和Alpha粒子的响应的基本本征模方程。找到了具有较小平行波数的整体Alfven本征模态和动力学Alfven波对于与TFTRTokamak后期操作相关的血浆参数不稳定。具有环型模型和极坐标模式编号（1，m）=（0，-2）的全局Alfven本征模态被认为是最危险的模态，对于相当广泛的可能的Alpha粒子分布，它仍然不稳定。动力学Alfven Waves的增长率对用于Alpha粒子有限陀螺半径效应的模型相当敏感，并且可以通过扩大Alpha粒子的径向分布或降低温度来稳定。然后检查Alfven Waves。 Alpha粒子通过过渡时间磁力泵浦与相速度接近Alpha粒子热速度的压缩Alfven波强烈相互作用，从而导致Alpha粒子大量吸收能量。使用低相速度压缩阿尔文波的常规电流驱动方案无法避免这种Alpha粒子吸收。使用K（，θ） k（，zeta）（k（，θ）和k（，zeta））的压缩波的高相速度电流驱动方案是极波数和环形波数），该新方案可以避免由于Alfven共振吸收而引起的Alpha粒子吸收和边缘加热。;该模型包括重要的动力学效应，例如有限的电子质量和有限的离子陀螺半径，这会导致Landau阻尼并形成L. Alfven连续体内的动力学Alfven波。此外，还引入了平衡电流密度梯度，磁剪切和有限ω/ω（，ci）效应，为在Alfven连续体以下形成整体Alfven本征模提供了条件。由于颗粒的大平衡漂移，Alpha颗粒的响应表现为附加的扰动电流。

著录项

  • 作者

    LI, YAN MING.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Plasma physics.
  • 学位 Ph.D.
  • 年度 1984
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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