Mode conversion in cold low-density plasma with a sheared magnetic field
Mode conversion in cold low-density plasma with a sheared magnetic field
复制标题
具有剪切磁场的冷低密度等离子体中的模式转换
DOI：
10.1063/1.5003931
复制
发表时间：
2017
影响因子：
2.2
通讯作者：
S. Kubo
中科院分区：
文献类型：
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作者：
I. Dodin;D. E. Ruiz;S. Kubo
提出了一种理论，描述了两个电磁模式在冷低密度等离子体中的相互转换，特别是在离子响应可以忽略不计的高频极限。与经典的模式转换理论（Landau-Zener型）不同，低密度等离子体中的共振耦合区域并不一定很窄，因此耦合矩阵不能用一阶泰勒展开式近似，初始条件的设置也不同。对于强磁剪切的情况下，一个简单的方法被确定为准备一个双模波，使其转化为一个单模波进入高密度等离子体。该理论可用于聚变等离子体波功率输入的简化模型。特别是，应用设想仿星器的研究，其中两个电磁模式附近的等离子体边缘的相互转换是一个已知的问题。
A theory is proposed that describes mutual conversion of two electromagnetic modes in cold low-density plasma, specifically, in the high-frequency limit where the ion response is negligible. In contrast to the classic (Landau–Zener-type) theory of mode conversion, the region of resonant coupling in low-density plasma is not necessarily narrow, so the coupling matrix cannot be approximated with its first-order Taylor expansion; also, the initial conditions are set up differently. For the case of strong magnetic shear, a simple method is identified for preparing a two-mode wave such that it transforms into a single-mode wave upon entering high-density plasma. The theory can be used for reduced modeling of wave-power input in fusion plasmas. In particular, applications are envisioned in stellarator research, where the mutual conversion of two electromagnetic modes near the plasma edge is a known issue.
Kobayashi S、Okada M.：“通过注射线粒体 lrRNA 恢复经紫外线照射的果蝇胚胎的极细胞形成能力。”
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