Development of Plasma Polarization Spectroscopy

我们定量地观察到了WT-3托卡马克(京都大学)等离子体发射线的极化；类铍氧和类氦碳线有时会出现强烈的极化。我们为前者建立了布居排列碰撞辐射(PACR)模型，并试图从观测到的谱线强度和偏振度重现电子的各向异性速度分布。我们得出结论，速度分布呈煎饼状，在极向方向上具有较高的分布。然而，我们不能定量地再现观察到的偏振度。计算包含偏振的截面的不太精确的近似被认为是造成这一失败的原因。伽马-10(筑波大学)的等离子体显示了来自中性和单一电离铁和铬的偏振线。极化程度高，极化的大小和意义随机变化，表明电子速度分布在空间和时间上随机变化。在HELIOTRON-J(京都大学)，巴尔默谱线表现出极化；巴尔默α具有更强的西格玛分量，而巴尔默β和伽马的极化降低。极化在复合阶段有增大的趋势。这表明在极轴方向有较高的速度分布。

We observed polarization of the emission lines from the WT-3 tokamak(Kyoto University)plasma quantitatively ; berylliumlike oxygen and heliumlike carbon lines were sometimes strongly polarized. We constructed the Population-Alignment Collisional-Radiative(PACR)model for the former, and tried to reproduce an anisotropic velocity distribution of electrons from the observed line intensities and polarization degree. We conclude that the velocity distribution is of a pancake shape having higher distribution in the poloidal direction. However, we could not reproduce quantitatively the degree of polarization as observed. The less accurate approximation for calculating the cross sections conceming polarization is assumed responsible for this failure. The GAMMA-10(Tsukuba University)plasmas revealed polarized lines from neutral and singly ionized iron and chrome. The polarization degrees are high and the magnitude and the sense of the polarization changed randomly, which indicates that the electron velocity distribution changed randomly in space and time. In HELIOTRON-J(Kyoto University)the Balmer lines showed polarization ; Balmer alpha had a stronger sigma component and polarization decreased for Balmer beta and gamma. Polarization tended to increase in the recombining phase. These indicate higher velocity distribution in the poloidal direction.