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Excitation of beta-induced Alfven eigenmodes in the presence of a magnetic island

机译:在磁岛存在下激发β诱导的Alfven本征模式

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摘要

Observation of magnetic activity in several discharges in the Frascati Tokamak Upgrade has revealed high-frequency oscillations that accompany the development of large magnetic islands in ohmic plasmas. The frequency of these oscillations is one order of magnitude above the typical island rotation frequency and one order of magnitude below the toroidicity-induced gap of the shear-Alfven continuum. By writing a precise dispersion relation, we interpret these modes as beta-induced Alfven eigenmodes, i.e. Alfven eigenmodes located in the low frequency gap which is caused by finite compressibility.
机译:在Frascati Tokamak升级版中,对几个放电中的磁活动进行观察后发现,高频振荡伴随着欧姆等离子体中大磁岛的形成。这些振荡的频率比典型的岛旋转频率高一个数量级,并且比由剪切力-Alfven连续体的圆弧引起的间隙低一个数量级。通过编写精确的色散关系,我们将这些模式解释为β诱导的Alfven本征模式,即位于低频间隙中的Alfven本征模式,这是由有限的可压缩性引起的。

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