The paper presents an investigation of the plasma fluctuation in the SMOLA helical mirror, which is suspected to be responsible for anomalous scattering. The helical mirror confinement is effective when the ion mean free path is equal to the helix pitch length. This condition can be satisfied in hot collisionless plasma only by anomalous scattering. The wave, which scatters the passing ions, is considered to receive energy from the trapped ions. The oscillations of the electric field in the helically symmetric plasma were observed in experiment. The oscillations have both regular highly correlated and chaotic components. The dependency of the regular component frequency on the Alfvén velocity is linear for $V_{\rm A} < 2.8 \times 10^6\ \text {m}\ \text {s}^{-1}$ and constant for higher values. It is shown experimentally that the condition for the wave to be in phase resonance with the trapped ions is satisfied in a specific region of the plasma column for the highly correlated component. The amplitude of the chaotic component (up to $3\ \text {V}\ \text {cm}^{-1}$ ) is higher than the estimated electric field required for the ion scattering.

中文翻译：

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螺旋对称多镜陷阱中的电磁振荡和反常离子散射

该论文对 SMOLA 螺旋镜中的等离子体涨落进行了研究，该涨落被怀疑是造成异常散射的原因。当离子平均自由程等于螺旋节距长度时，螺旋镜限制有效。在热无碰撞等离子体中，只有反常散射才能满足该条件。散射经过的离子的波被认为从被捕获的离子接收能量。实验观察到了螺旋对称等离子体中电场的振荡。振荡既有规则的高度相关成分，也有混沌成分。规则分量频率对阿尔文速度的依赖性是线性的 $V_{\rm A} < 2.8 \times 10^6\ \text {m}\ \text {s}^{-1}$ 对于更高的值则为常数。实验表明，对于高度相关的成分，在等离子体柱的特定区域中满足波与捕获离子同相共振的条件。混沌分量的幅度（高达 $3\ \文字{V}\ \文字{cm}^{-1}$ ）高于离子散射所需的估计电场。