Physics of Plasma Confined by a Dipole Magnetic Field

建议的工作是进行和分析两个具体的 使用新组装的无碰撞Terrella进行实验 实验（CTX）。 这些实验的结果将 大大扩展了我们对无碰撞粒子理解 行星磁层中的运输。 它们将被用来测试 动力学诱导的混沌和输运的基本理论， 偶极磁场的静态非轴对称扰动。 在第一个实验中，高能电子被困在 偶极磁场将通过操作我们的 微波等离子体源，以便直接加热高场 偶极子的区域。 正如在别处看到的，这些电子将 变得不稳定到低频互换的频谱 不稳定性和诱导无碰撞径向传输。 我们将 测量的振幅，频率和波长的 波动，混沌开始的条件，以及 产生的运输量。 我们也将能够 观察边缘稳定的压力分布和测试理论 绝热输运 在第二个实验中，我们将采用 高能电子等离子体的多极静态扰动 打破方位对称性，破坏 角动量 通过测量限制的减少 当扰动的大小为 增加，我们将能够记录导致 三维混沌 这些实验将得到指导， 通过数值和理论分析来解释。 通过使 实验室和数值模拟之间的相关性，我们 将演示磁场波动如何导致 和偶极子场中高能粒子的加热，并建立 类似过程发生在行星上的模型 磁层

The proposed work is to conduct and analyze two specific experiments using the newly assembled Collisionless Terrella Experiment (CTX). The results from these experiments will significantly expand our understanding of collisionless particle transport in planetary magnetospheres. They will be used to test basic theories of chaos and transport induced by dynamic and static non-axisymmetric perturbations to a dipole magnetic field. For the first experiment, energetic electrons trapped within the dipole magnetic field will be generated by operating our microwave plasma source so as to directly heat the high-field regions of the dipole. As seen elsewhere, these electrons will become unstable to a spectrum of low-frequency interchange instabilities and induce collisionless radial transport. We will measure the amplitude, frequency, and wavelength of the fluctuations, the condition for the onset of chaos, and the magnitude of the resulting transport. We will also be able to observe marginally-stable pressure profiles and test theories of adiabatic transport. For the second experiment, we will impose a multipolar static perturbation to the energetic electron plasma breaking azimuthal symmetry and destroying conservation of angular momentum. By measuring the decrease in the confinement of the trapped electrons as the magnitude of the perturbation is increased, we will be able to document the conditions leading to three-dimensional chaos. These experiments will be guided and interpreted by numerical and theoretical analysis. By making correlations between laboratory and numerical simulations, we will demonstrate how magnetic fluctuations can induce transport and heating of energetic particles in dipole fields and establish models for similar processes occurring in planetary magnetospheres.