High energy components and collective modes in thermonuclear plasmas
High energy components and collective modes in thermonuclear plasmas
复制标题
热核等离子体中的高能成分和集体模式
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
F. Pegoraro
中科院分区：
文献类型：
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作者：
B. Coppi;S. Cowley;R. Kulsrud;P. Detragiache;F. Pegoraro
提出了一类频率在离子回旋频率及其谐波范围内的热核磁约束等离子体的集体模理论。这些模式可以通过它们与相对高能粒子的等离子体成分的共振回旋相互作用来激发，这些等离子体成分在速度空间中具有强烈的各向异性分布。发现了由于等离子体密度不均匀而在空间上局域化的简正波。这确保了从它们的共振相互作用中获得的能量不会被带走。对于一类给定的等离子体密度分布，磁场的不均匀性可以显著改变模式的空间局部化。特别关注自旋极化等离子体的情况，其中聚变反应的带电产物是各向异性分布的。结果表明，对于提高核反应速率的极化模式，对于具有相对温和的限制磁场梯度的环形组态，氚将被快速去极化。
The theory of a class of collective modes of a thermonuclear magnetically confined plasma, with frequencies in the range of the ion‐cyclotron frequency and of its harmonics, is presented. These modes can be excited by their resonant cyclotron interaction with a plasma component of relatively high‐energy particles characterized by a strongly anisotropic distribution in velocity space. Normal modes that are spatially localized by the inhomogeneity of the plasma density are found. This ensures that the energy gained by their resonant interaction is not convected away. The mode spatial localization can be significantly altered by the magnetic field inhomogeneity for a given class of plasma density profiles. Special attention is devoted to the case of a spin polarized plasma, where the charged products of fusion reactions are anisotropically distributed. It is shown that for the mode of polarization that enhances nuclear reaction rates the tritium will be rapidly depolarized for toroidal configurations with relatively mild gradients of the confining magnetic field.