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首页> 外文期刊>Nuclear fusion >Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra
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Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra

机译：通过快速离子D-alpha光谱的层析反演测量二维快速离子速度分布函数

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摘要

We present the first measurement of a local fast-ion 2D velocity distribution function ƒ (ν_‖, ν_⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion D_α (FIDA) light from the plasma centre in three views simultaneously. The measured spectra agree very well with synthetic spectra calculated from a TRANSP/NUBEAM simulation. Based on the measured FIDA spectra alone, we inferƒ (ν_‖, ν_⊥) by tomographic inversion. Salient features of our measurement of ƒ (ν_‖, ν_⊥) agree reasonably well with the simulation: the measured as well as the simulated ƒ (ν_‖, ν_⊥) are lopsided towards negative velocities parallel to the magnetic field, and they have similar shapes. Further, the peaks in the simulation of ƒ (ν_‖, ν_⊥) at full and half injection energies of the neutral beam also appear in the measurement at similar velocity-space locations. We expect that we can measure spectra in up to seven views simultaneously in the next ASDEX Upgrade campaign which would further improve measurements of ƒ (ν_‖, ν_⊥) by tomographic inversion.
机译：我们介绍了局部快速离子二维速度分布函数ƒ（ν__，ν_⊥）的首次测量。为此，我们通过中性束注入在ASDEX升级版中加热了等离子体，并同时从三个视图中测量了来自等离子体中心的快离子D_α（FIDA）光的光谱。测得的光谱与从TRANSP / NUBEAM模拟计算得出的合成光谱非常吻合。仅根据测得的FIDA光谱，我们可以通过断层扫描反演来推断（ν_”，ν_⊥）。我们测量ƒ（ν_”，ν_⊥）的显着特征与模拟非常吻合：被测以及模拟ƒ（ν_”，ν_⊥）偏向平行于磁场的负速度，它们具有相似的形状。此外，在中性束全能量和半能量注入能量下，ƒ（ν__，ν_⊥）模拟中的峰值也出现在类似速度空间位置的测量中。我们期望在下一个ASDEX升级活动中可以同时在多达七个视图中测量光谱，这将通过层析反演进一步改善ƒ（ν_​​”，ν_⊥）的测量。

著录项

  • 来源
    《Nuclear fusion》 |2014年第2期|023005.1-023005.7|共7页
  • 作者

    M. Salewski; B. Geiger; A.S. Jacobsen; M. Garcia-Munoz; W.W. Heidbrink; S.B. Korsholm; F. Leipold; J. Madsen; D. Moseev; S.K. Nielsen; J. Rasmussen; M. Stejner; G. Tardini; M. Weiland;

  • 作者单位

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Department of Physics, University of Seville, Seville, Spain;

    University of California, Department of Physics and Astronomy, Irvine, CA 92697, USA;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- DTU, Technical University of Denmark, Department of Physics, DK-2800 Kgs. Lyngby, Denmark;

    Association Euratom- Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany;

    Association Euratom- Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany;

  • 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
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  • 关键词

    fast-ion velocity distribution function; tomography; inverse problems; fast ions in tokamaks;

    机译：快速离子速度分布函数;断层扫描反问题托卡马克中的快速离子;

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