Penning放电中轮辐旋转频率的定标
Scaling of Spoke Rotation Frequency within a Penning Discharge
摘要：
一个旋转的等离子体辐条示出发展中的潘宁放电截面的二维全尺寸动力学模拟。放电中的电子跨场输运是高度反常的，并与轮辐相位密切相关。碰撞和无碰撞模拟之间的相似性表明，电离是没有必要的辐条形成。用放电电流$I_d$、施加磁场强度$B$和离子质量$m_i$进行的参数扫描显示轮辐频率与$\sqrt{e E_r L_n / m_i}$成比例，其中$E_r$是径向电场，$L_n$是梯度长度比例，并且$e$是基本电荷。这种比例表明，辐条可能发展为非线性阶段的碰撞西蒙-何不稳定性。
英文摘要：
A rotating plasma spoke is shown to develop in two-dimensional full-sized kinetic simulations of a Penning discharge cross-section. Electron cross-field transport within the discharge is highly anomalous and correlates strongly with the spoke phase. Similarity between collisional and collisionless simulations demonstrates that ionization is not necessary for spoke formation. Parameter scans with discharge current $I_d$, applied magnetic field strength $B$ and ion mass $m_i$ show that spoke frequency scales with $\sqrt{e E_r L_n / m_i}$, where $E_r$ is the radial electric field, $L_n$ is the gradient length scale and $e$ is the fundamental charge. This scaling suggests that the spoke may develop as a non-linear phase of the collisionless Simon-Hoh instability.
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