Production of super-Alfvenic plasma flow and elucidation of magneto-plasma fluid dynamics with structural change

超阿尔芬等离子体流的产生以及结构变化的磁等离子体流体动力学的阐明

基本信息

批准号：
17340170
负责人：
INUTAKE Masaaki
金额：
$ 8.96万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340170/
关键词：
Plasma and Fusion Fluid mechanics Magneto-hydro dynamics Supersonic plasma flow Alfven velocity

项目摘要

In this research we have carried out various experiments for the following purposes.(1) Realization of wide range of ion Mach number M_i and Alfven Mach number M_A parameters.(2) Verification of the extended Bernouilli's equation in a high-beta plasma flow,(3) Establishment of the experimental evaluation method of an adiabatic exponent in a fast-flowing plasma,(4) Elucidation of magneto-plasma dynamics in a super-Alfvenic flow associated with structural change of magnetic field.In order to establish control method of the Mach numbers and to perform various experimental researches in a super-Alfvenic plasma flow, a magneto-plasma-dynamic arcjet (MPDA) was modified and small magnetic coil was attached to form magnetic nozzle at the muzzle of the improved MPDA.A multiple-reflection type visible light laser interferometer was equipped for electron density measurement near the MPDA exit, and the electron density in the magnetic nozzle region was measured.We have also measured plasma flow dynamics in various magnetic configurations, especially utilizing the combination between ion heating and magnetic nozzle. A super-Alfvenic plasma flow was successfully generated and plasma flows were realized in a wide range of M_i, and M_A parameters.In order to analyze the plasma flow dynamics, it is necessary to evaluate the adiabatic exponent of ions experimentally. There was no research to measure the adiabatic exponent experimentally until now. We have established the evaluation method of an adiabatic exponent from the behavior of fast-flowing plasmas in magnetic nozzle. It was also able to clarify temporal evolution of the adiabatic exponent.As a result, we have established the generation and control method of fast-flowing plasma, and clarified experimentally dynamics of fast-flowing plasmas in a wide range of M_i and M_A parameters. In this research, we have obtained a lot of important knowledge related to various plasma physics and applied researches.

在本研究中，我们进行了以下目的的各种实验。（1）宽范围离子马赫数M_i和阿尔文马赫数M_A参数的实现。（2）高β等离子体流中扩展伯努利方程的验证， (3)建立快速流动等离子体中绝热指数的实验评估方法，(4)阐明与结构相关的超阿尔芬流中的磁等离子体动力学为了建立马赫数的控制方法并在超阿尔芬等离子体流中进行各种实验研究，对磁等离子体动力电弧喷射器（MPDA）进行了改造，并附加了小型磁线圈以形成磁力改进后的MPDA枪口处的喷嘴。在MPDA出口附近配备了多重反射式可见光激光干涉仪进行电子密度测量，测量了磁喷嘴区域的电子密度。我们还测量了各种等离子体流动力学。磁的配置，特别是利用离子加热和磁性喷嘴之间的组合。成功产生了超阿尔芬等离子体流，并在较宽的M_i和M_A参数范围内实现了等离子体流。为了分析等离子体流动力学，有必要通过实验评估离子的绝热指数。迄今为止，还没有研究通过实验测量绝热指数。我们根据磁喷嘴中快速流动等离子体的行为建立了绝热指数的评估方法。它还能够阐明绝热指数的时间演化。因此，我们建立了快速流动等离子体的产生和控制方法，并通过实验阐明了大范围M_i和M_A参数下快速流动等离子体的动力学。在这项研究中，我们获得了许多与各种等离子体物理和应用研究相关的重要知识。