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首页> 外文期刊>Nuclear fusion >Parametric decay instability during high harmonic fast wave heating experiments on the TST-2 spherical tokamak
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Parametric decay instability during high harmonic fast wave heating experiments on the TST-2 spherical tokamak

机译：TST-2球形托卡马克高谐波快速波加热实验中的参数衰减不稳定性

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摘要

A degradation of heating efficiency was observed during high harmonic fast wave (HHFW) heating of spherical tokamak plasmas when parametric decay instability (PDI) occurred. Suppression of PDI is necessary to make HHFW a reliable heating and current drive tool in high β plasmas. In order to understand PDI, measurements were made using a radially movable electrostatic probe (ion saturation current and floating potential), arrays of RF magnetic probes distributed both toroidally and poloidally, microwave reflectometry and fast optical diagnostics in TST-2. The frequency spectrum usually exhibits ion-cyclotron harmonic sidebands f_0 ± nf_(ci) and low-frequency ion-cyclotron quasi-modes (ICQMs) nf_(ci). PDI becomes stronger at lower densities, and much weaker when the plasma is far away from the antenna. The lower sideband power was found to increase quadratically with the local pump wave power. The lower sideband power relative to the local pump wave power was larger for reflectometer compared with either electrostatic or magnetic probes. The radial decay of the pump wave amplitude in the SOL was much faster for the ion saturation current than for the floating potential. These results are consistent with the HHFW pump wave decaying into the HHFW or ion Bernstein wave (IBW) sideband and the low-frequency (ICQM). Two additional peaks were discovered between the fundamental lower sideband and the pump wave in hydrogen plasmas. The frequency differences of these peaks from the pump wave increase with the magnetic field. These decay modes may involve molecular ions or partially ionized impurity ions.
机译：当发生参数衰减不稳定性（PDI）时，在球形托卡马克等离子体的高次谐波快速波（HHFW）加热过程中，观察到加热效率下降。为了使HHFW在高β等离子体中成为可靠的加热和电流驱动工具，必须抑制PDI。为了理解PDI，使用可径向移动的静电探头（离子饱和电流和浮动电位），环形和极向分布的RF电磁探头阵列，微波反射法和TST-2中的快速光学诊断进行了测量。频谱通常表现出离子回旋加速器谐波边带f_0±nf_（ci）和低频离子回旋加速器准模式（ICQM）nf_（ci）。 PDI在较低的密度下会变强，而在等离子远离天线时会变弱。发现下边带功率随本地泵浦波功率成平方增加。与静电或磁性探头相比，反射计相对于本地泵浦波功率的较低边带功率更大。离子饱和电流中SOL泵浦波幅度的径向衰减比浮动电位快得多。这些结果与HHFW泵浦波衰减到HHFW或离子伯恩斯坦波（IBW）边带和低频（ICQM）一致。在氢等离子体的基本下边带和泵浦波之间发现了两个附加峰。这些来自泵浦波的峰值的频率差随磁场的增加而增加。这些衰减模式可能涉及分子离子或部分离子化的杂质离子。

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  • 来源
    《Nuclear fusion》 |2009年第6期|24.1-24.6|共6页
  • 作者

    T. Oosako; Y. Takase; A. Ejiri; Y. Nagashima; Y. Adachi; H. Kasahara; T. Yamada; O. Watanabe; H. Tojo; S. Kainaga; J. Sugiyama; T. Yamaguchi; B. An; H. Hayashi; H. Kobayashi; H. Kurashina; H. Matsuzawa; K. Yamada; R. Kumazawa; F. Shimpo; Y. Ono; T. Masuda; M. Sasaki;

  • 作者单位

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    National Institute for Fusion Science, Toki 509-5292 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    National Institute for Fusion Science, Toki 509-5292 Japan;

    National Institute for Fusion Science, Toki 509-5292 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

    The University of Tokyo, Kashiwa 277-8561 Japan;

  • 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

    fusion reactors; tokamaks; spherical tokamaks; current drive; helicity injection;

    机译：聚变反应堆托卡马克球形托卡马克当前驱动器;螺旋注射;

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