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ROLES AND PRODUCTION MECHANISM OF ENERGETIC PARTICLES AT SELF-ORGANIZATION IN REP

REP自组织中含能粒子的作用及产生机制

基本信息

批准号：
03680011
负责人：
MASAMUNE Sadao
金额：
$ 0.32万
依托单位：
KYOTO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The purpose of the present research is to obtain some insights into production mechanism of energetic particles in STE-2 RFP at Kyoto Instute of Technology. During the first year, an X-ray probe, consisting of a metal target and a surface barrier diode with polyester filters, was constructed. And, at the same time, effects of the proximity of conducting shell (b/a, where b and a are the plasma and shell minor radii, respectively) on REP plasma performance were studied for improving the RFP discharges. It was found that discharge resistance decreased by a factor of 2 with an improved shell proimity (b/a=1.07(] SY.scharw.[)1.02). During the following year, energetic electron studies were performed with the X-ray probe in STE-2 with the close fitting shell. The major results obtained are as follows: (i) We have observed non-thermal electrons with energies around 400-500 eV, much higher than the bulk electron temperature of 40-50 eV, in the edge region r/a>0.7. (ii) The energetic electrons flow along the magnetic field line in the sense that they are accelerated by the Ohmic electric field in the central region. (iii) The energetic electron density decreases with an increase in fill pressure. The pressure dependence of the energetic electron density is the first observation in RFP's. Thus, a detailed comparison of the results with theoretical models of production mechanism of fast electrons is beneficial to understanding the RFP plasma dynamics. We have also made an estimate for applying the technique of an electromotive force (EMF) probe which is a combination of a directional probe and a magnetic pickup coil. It has been found that under certain plasma conditions, we can estimate the magnetohydrodynamic (MHD) dynamo term <vxB> with this probe.

本研究的目的是对京都工业大学STE-2 RFP中高能粒子的产生机制有一些了解。在第一年，X射线探头，包括一个金属靶和一个表面势垒二极管与聚酯过滤器，建造。同时，为了改善RFP放电，研究了导电壳层的接近度（B/a，其中B和a分别为等离子体和壳层的小半径）对REP等离子体性能的影响。发现放电电阻降低了1/2，壳层性能得到改善（B/a=1.07）。（1.02）。在接下来的一年里，高能电子研究进行了X射线探头在STE-2与紧密配合的外壳。主要结果如下：（1）在r/a>0.7的边缘区，我们观测到能量在400-500 eV的非热电子，远高于体电子温度40-50 eV。(ii)高能电子沿着磁场线流动，因为它们在中心区域被欧姆电场加速。(iii)高能电子密度随着填充压力的增加而减小。高能电子密度的压力依赖性是RFP的第一个观察。因此，将计算结果与快电子产生机制的理论模型进行详细的比较，有助于对RFP等离子体动力学的理解。我们还估计了应用电动势（EMF）探头的技术，这是一个定向探头和磁拾波线圈的组合。研究发现，在一定的等离子体条件下，利用该探针可以估计磁流体动力学发电机项<vxB>。