Ion temperature anisotropy in an expanding magnetized plasma is investigated using laser induced fluorescence. Parallel and perpendicular ion velocity distribution functions (IVDFs) were measured simultaneously with high spatial resolution in the expanding plasma. Large ion temperature anisotropies ( T ⊥ i / T ∥ i ∼ 10) are observed in a conical region at the periphery of the expanding plasma plume. A simple 2D Boris stepper model that incorporates the measured electric field structure is able to reproduce the gross features of the measured perpendicular IVDFs. A Nyquist stability analysis of the measured IVDFs suggests that multiple instabilities with k ⊥ ρ i ∼ 1 and k | | ρ i ∼ 0.2 are likely to be excited in these plasmas.

中文翻译：

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在实验室等离子体中产生大的温度各向异性

使用激光诱导荧光研究了膨胀磁化等离子体中的离子温度各向异性。在膨胀等离子体中以高空间分辨率同时测量平行和垂直离子速度分布函数 (IVDF)。在膨胀的等离子体羽流外围的锥形区域中观察到大的离子温度各向异性 (T ⊥ i / T ∥ i ∼ 10)。包含测量电场结构的简单 2D Boris 步进器模型能够重现测量的垂直 IVDF 的总体特征。对测得的 IVDF 的奈奎斯特稳定性分析表明 k ⊥ ρ i ∼ 1 和 k | 的多重不稳定性。| ρ i ∼ 0.2 可能在这些等离子体中被激发。