Experimental Investigation of Electromagnetic Ion- Temperature-Anisotropy Driven Instabilities

该提案的目标是在实验室等离子体装置中产生不稳定的电磁离子温度各向异性（EMITA）驱动波。根据要测试的理论，需要高B等离子体和大量的离子温度各向异性。等离子体将由一个电感耦合的“螺旋”源产生，该源通过增加离子回旋加速器共振加热而得到增强。额外的垂直加热允许调节离子温度的各向异性，并将离子温度提高到电子温度。实现高B等离子体的尝试将涉及让等离子体膨胀到与螺旋源末端相匹配的低磁场腔室。腔室足够大，使离子回旋半径小于腔室直径。实验室实验的目标是提供足够的信息，以基准理论预测的EMITA不稳定性行为。这种不稳定性在磁鞘中很重要，并已通过AMPTEE/CCE测量进行了研究。

The objective of the proposal is to produce, in a laboratory plasma device, unstable electromagnetic ion-temperature-anisotropy (EMITA) driven waves. According to the theory to be tested, a high B plasma and a substantial ion temperature anisotropy are required. The plasma will be generated with an inductively coupled "helicon" source that has been enhanced by the addition of ion cyclotron resonant heating. The additional perpendicular heating permits adjustment of the ion temperature anisotropy and raises the ion temperature to the electron temperature. An attempt to achieve a high B plasma will involve letting the plasma expand in to a low magnetic field chamber mated to the end of the helicon source. The chamber is large enough so that the ion gyroradius is smaller than the chamber diameter. The goal of the laboratory experiment is to provide enough information to benchmark the theoretically predicted behavior of the EMITA instability. This instability has been proposed as important in the magnetosheath and has been studied with AMPTEE/CCE measurements.