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The effect of density fluctuations on electron cyclotron beam broadening and implications for ITER

机译：密度波动对电子回旋加速器束展宽的影响及其对ITER的影响

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摘要

We present state-of-the-art computations of propagation and absorption of electron cyclotron waves, retaining the effects of scattering due to electron density fluctuations. In ITER, injected microwaves are foreseen to suppress neoclassical tearing modes (NTMs) by driving current at the q = 2 and q = 3/2 resonant surfaces. Scattering of the beam can spoil the good localization of the absorption and thus impair NTM control capabilities. A novel tool, the WKBeam code, has been employed here in order to investigate this issue. The code is a Monte Carlo solver for the wave kinetic equation and retains diffraction, full axisymmetric tokamak geometry, determination of the absorption profile and an integral form of the scattering operator which describes the effects of turbulent density fluctuations within the limits of the Born scattering approximation. The approach has been benchmarked against the paraxial WKB code TORBEAM and the full-wave code IPF-FDMC. In particular, the Born approximation is found to be valid for ITER parameters. In this paper, we show that the radiative transport of EC beams due to wave scattering in ITER is diffusive unlike in present experiments, thus causing up to a factor of 2-4 broadening in the absorption profile. However, the broadening depends strongly on the turbulence model assumed for the density fluctuations, which still has large uncertainties.
机译：我们介绍了电子回旋波传播和吸收的最新技术，并保留了由于电子密度波动而引起的散射效应。在ITER中，可以预见注入的微波通过在q = 2和q = 3/2谐振表面上驱动电流来抑制新古典的撕裂模式（NTM）。光束的散射会破坏吸收的良好局部性，从而损害NTM控制能力。为了调查此问题，此处使用了一种新颖的工具WKBeam代码。该代码是波动动力学方程的蒙特卡洛求解器，保留了衍射，完整的轴对称托卡马克几何形状，吸收轮廓的确定以及散射算子的积分形式，该形式描述了在Born散射近似范围内湍流密度波动的影响。 。该方法已针对近轴WKB代码TORBEAM和全波代码IPF-FDMC作了基准测试。特别地，发现伯恩近似对ITER参数有效。在本文中，我们表明，与目前的实验不同，由于ITER中的波散射而导致的EC束的辐射传输具有扩散性，因此导致吸收分布范围扩大了2-4倍。但是，展宽在很大程度上取决于为密度波动假设的湍流模型，该模型仍具有较大的不确定性。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016002.1-016002.13|共13页
  • 作者

    A. Snicker; E. Poli; O. Maj; L. Guidi; A. Koehn; H. Weber; G. Conway; M. Henderson; G. Saibene;

  • 作者单位

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany,Department of Applied Physics, Aalto University, FI-00076 A ALTO, Finland;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany;

    ITER Organization, 13108 St Paul lez Durance, France;

    Fusion for Energy, C/Josep Pla 2, Torres Diagonal Litoral-B3, E-08019 Barcelona, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electron cyclotron beam; density fluctuations; scattering operator; ITER;

    机译：电子回旋束密度波动;散射算子;国际热核实验堆;

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