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Plasma Polarization Spectroscopy (PPS) : Its Development and Diagnostics Application

等离子体偏振光谱（PPS）：其发展和诊断应用

基本信息

批准号：
06302080
负责人：
FUJIMOTO Takashi
金额：
$ 2.75万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

In the joint experiment by Kato (Osaka) and Fujimoto (Kyoto) , we have found that the neonlike germanium x-ray laser radiation is polarized by 20-50%. The anisotropic radiation trapping of the resonance line from the lower level of the laser transition is identified as the cause of the polarization. Impurity ion (boronlike-and berylliumlike oxygen and heliumlike carbon) lines from the WT-3 tokamak (Kyoto) is found polarized at the biginning of the lower-hybrid current drive and the electron-cyclotron heating. Polarization was examined of the spectrum of the laser-produced fluorine plasma in the recombining plasma mode, and the heliumlike resonance line and the recombination continuum were found polarized. These facts suggests that polarization is not a special phenomenon but plasma emissions tend to be polarized in many cases.For the purpose of combining the observed polarization to the spatial anisotropy, or non-thermal properties, of the plasma the alignment collisional-radiative model has been developed. This is an extension of the population collisionalraidative model that is commonly employed to analyze the population kinetics in plasma. The cross section necessary in this new model, e.g., the alignment creation cross section by electron impacts, is being calculated.Instrumentation for PPS has been developed : A calcite plate is introduced in a spectrometer and the two polarized components are separated and measured simultaneously ; Liquid crystals are used for observation of the solar corona ; The CCD detector is used as a polarization sensitive equipment.

在Kato（大坂）和Fujimoto（京都）的联合实验中，我们发现类锗X射线激光辐射被偏振20- 50%。从激光跃迁的较低水平的谐振线的各向异性辐射捕获被确定为偏振的原因。在低杂波电流驱动和电子回旋加热的初始阶段，发现WT-3托卡马克（京都）的杂质离子（类硼氧、类铍氧和类氦碳）谱线发生极化。在复合等离子体模式下，研究了激光产生的氟等离子体光谱的偏振，发现类氦共振线和复合连续谱都发生了偏振。这些事实表明，极化并不是一种特殊的现象，但在许多情况下等离子体的辐射往往是极化的。为了将观测到的极化与等离子体的空间各向异性或非热性质相结合，发展了准直碰撞辐射模型。这是粒子数碰撞辐射模型的推广，该模型常用于分析等离子体中的粒子数动力学。这种新模型中所需的横截面，例如，研制了一套PPS的测量仪器：在光谱仪中引入方解石片，同时分离和测量两个偏振分量;用液晶观测日冕;用CCD探测器作为偏振敏感装置。