Development of Plasma Polarization Spectroscopy

等离子体偏振光谱的发展

• 批准号: 10308017
• 负责人: FUJIMOTO Takashi
• 金额: $ 20.03万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10308017/
• 关键词: plasma spectroscopy; polarization; tokamak; electron velocities; anisotropic distribution; non-thermal distribution; beryiliumlike oxygen; Balmer alpha; ミラー; 分光; 衝突・幅射モデル; 縦アラインメント; 衝突・輻射モデル

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.

我们观察了从WT-3托卡马克（京都大学）等离子体的发射线的偏振定量;铍类氧和氦类碳线有时强烈极化。我们建立了前者的布居-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来再现电子的各向异性速度分布。结果表明，速度分布呈饼状，在极向上具有较高的分布。然而，我们不能定量地再现所观察到的偏振度。计算极化截面的不太精确的近似值被认为是造成这种失败的原因。的伽马-10（筑波大学）等离子体揭示了中性和单离子化铁和Chrome的极化线。结果表明，电子的极化程度较高，极化强度和极化方向随机变化，表明电子速度分布在空间和时间上都是随机变化的。在HELIOTRON-J（京都大学）中，巴耳末线显示出偏振;巴耳末α具有更强的σ分量，巴耳末β和γ的偏振降低。极化倾向于增加在重组阶段。这表明极向速度分布较高。

项目成果

T.Fujimoto: "Plasma Polarization Spectroscopy" Com.At.Mol.Opt.Phys.(in press). (1999)

T.Fujimoto：“等离子体偏振光谱”Com.At.Mol.Opt.Phys.（正在印刷中）。

T.Wakabayashi et al.: "Cross section for disalignment of excited neon atoms due to neon or helium atom collisions"J.Phys.B. 31. 341-359 (1998)

T.Wakabayashi 等人：“由于氖原子或氦原子碰撞而激发的氖原子错位的横截面”J.Phys.B.

T.Fujimoto and T.Imaida: "Three-body recombination and excited-atom populations in a non-Maxwellian or anisotropic plasma"Inst.Phys.Conf.Ser.. 159. 415-418 (1998)

T.Fujimoto 和 T.Imaida：“非麦克斯韦或各向异性等离子体中的三体重组和激发原子群”Inst.Phys.Conf.Ser.. 159. 415-418 (1998)

T.Fujimoto: "Plasma polarization spectroscopy"Plasma Phys.Control.Fusion. 41. A625-A633 (1999)

T.Fujimoto：“等离子体偏振光谱”Plasma Phys.Control.Fusion。

T.Fujimoto: "Three-body recombination and excited-atom populations in a non-Maxwellian or anisotropic plasma"Inst. Phys. Conf. Ser.. 159. 415-418 (1999)

T.Fujimoto：“非麦克斯韦或各向异性等离子体中的三体重组和激发原子群”Inst。