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Stix最先提出在仿星器直线段中进行离子回旋共振加热的概念,所采用的模是离子回旋波,这是一类频率接近但略低于离子回旋频率的波,他称其为慢波。当离子回旋波向磁场较弱的空间区域传播,因而波频率越来越接近局部的离子回旋频率时,波将很快衰减,称“磁滩”效应。对托卡马克或一般的磁场不均匀的系统,Stix证明,只有频率大于离子回旋频率的波才能在等离子体中心区传播,称为快波,因此托卡马克中的ICRF加热也称快波加热。文献[2]被认为是ICRF加热的基准性文献。但在以后的研究中,对快波和慢波的分离并不与文献[2]中一致,本文对有关问题进行讨论,以澄清容易混淆之处。
Stix first proposed the concept of ion cyclotron resonance heating in a straight line segment of a stellarator, using an ion cyclotron, a class of waves with frequencies near but slightly below the ion cyclotron frequency, which he calls slow waves. When the ion cyclotron wave propagates to a weak magnetic field, the wave frequency will get closer to the local ion cyclotron frequency, and the wave will decay rapidly, which is called the “magnetic beach” effect. For systems that are tokamak or inhomogeneous in general, Stix proves that only waves with frequencies greater than the ion cyclotron can propagate through the central region of the plasma called fast waves, so ICRF heating in tokamak is also called fast wave heating. Reference [2] is considered as a reference for ICRF heating. However, in the later research, the separation of fast and slow waves is not consistent with the literature [2]. This article discusses the related issues to clarify the confusing place.