论文标题
旋转的形成机理在部分磁化等离子体中说话
Formation mechanism of the rotating spoke in partially magnetized plasmas
论文作者
论文摘要
旋转辐条通常发生在部分磁化的等离子体设备中。在本文中，通过均匀的轴向磁场均匀的2D径向径向粒子/蒙特卡洛碰撞模拟，研究了M = 1旋转辐条模式的驱动机制。我们发现，由于较低的杂化型不稳定性不断发展到长波长状态，因此可以解释辐条电位驼峰区域的形成。结果表明，非中性阳极鞘中的初始短波不稳定性经历了一系列过渡到大型模式。将鞘对不稳定性的非中性效应考虑并纳入较低杂种不稳定性的两流体线性理论中。该理论在线性相和非线性演化中预测的不稳定模式与粒子模拟中开发的波动模式非常吻合。
Rotating spokes commonly occur in partially magnetized plasmas devices. In this paper, the driving mechanism behind the formation of an m=1 rotating spoke mode in a magnetically enhanced hollow cathode arc discharge is investigated by means of 2D radial-azimuthal particle-in-cell/Monte Carlo collision simulations with a uniform axial magnetic field. We find that the formation of the spoke potential hump region can be explained as a result of the positive anode sheath collapse due to the lower hybrid type instability evolving into the long wavelength regime. It is shown that an initial short-wavelength instability in the non-neutral anode sheath undergoes a sequence of transitions into the large scale modes. The sheath non-neutrality effect on the instability is considered and incorporated in the two-fluid linear theory of the lower hybrid instability. The unstable modes predicted by the theory in the linear phase and nonlinear evolution are in good agreement with the fluctuation modes developed in the particle simulations.
