Cyclotron Instabilities in an Anisotropic Plasma
Cyclotron Instabilities in an Anisotropic Plasma
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各向异性等离子体中的回旋加速器不稳定性
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
V. Pistunovich
中科院分区：
文献类型：
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作者：
A. Timofeev;V. Pistunovich
在本综述中，我们将推广和系统化的结果，已获得的稳定性的等离子体在磁场中的速度分布时，不是各向同性的调查。在这一领域的第一项工作是Harris [1]的工作，他证明了具有各向异性电子速度分布的等离子体在电子回旋波的激发下是不稳定的。后来，人们的注意力转向了具有各向异性离子速度分布的等离子体中的稳定性问题（Zerofeev [2]，Kitsenko和Stepanov [3]，Dnestrovskii，Kostomarov和Pistunovich [4]，Dory，Guest和Harris [5]，Hall，Heckrotte和Kammash [6]，Post和Rosenbluth [7]等）。绝热阱中的等离子体必须具有各向异性的速度分布，因为只有当与离子沿着磁场运动相关的能量比横向能量小得多时，才可能在这种系统中有效地约束等离子体。在这些条件下，该理论表明激发频率接近于离子回旋频率的振荡的可能性，并且该理论结果已经在实验中多次得到验证，其中在回旋频率处观察到噪声。由于这种噪声的强度比热能级大许多个数量级，因此它与不稳定波的激发有关[8，9]。
In the present review we shall generalize and systematize results that have been obtained in the investigation of the stability of a plasma in a magnetic field when the velocity distribution is not isotropic. The first work in this field is that of Harris [1], who showed that a plasma with an anisotropic electron velocity distribution is unstable against the excitation of electron cyclotron waves. Later, attention was directed to the stability problem in a plasma with an anisotropic ion velocity distribution (Timofeev [2], Kitsenko and Stepanov [3], Dnestrovskii, Kostomarov, and Pistunovich [4], Dory, Guest, and Harris [5], Hall, Heckrotte, and Kammash [6], Post and Rosenbluth [7], and others). A plasma in an adiabatic trap must necessarily have an anisotropic velocity distribution since the effective confinement of plasma in such a system is possible only when the energy associated with the ion motion along the magnetic field is much smaller than the transverse energy. Under these conditions, the theory indicates the possibility of excitation of oscillations with frequencies close to the ion-cyclotron frequency, and this theoretical result has been verified many times in experiments in which noise is observed at the cyclotron frequencies. Since the intensity of this noise is many orders of magnitude greater than the thermal level, it is justifiably associated with the excitation of unstable waves [8, 9].