权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Investigation of Atomic Collisional.Radiative Processes in Neutral Particle Beams and Its Application to Plasma Diagnostics

中性粒子束中原子碰撞辐射过程的研究及其在等离子体诊断中的应用

基本信息

批准号：
03680012
负责人：
ODA Toshiatsu
金额：
$ 1.15万
依托单位：
HIROSHIMA UNIVERSITY
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

We investigated numerically the atomic collisional-radiative processes in neutral particle beam for plasma diagnostics in magnetic fusion plasmas 1. To make numerical studies on processes of excitation, ionization and radiation including laser-induced fluorescences in helium neutral particle beam injected into tokamak plasmas, we formulated a set of rate equations based on a collisional-radiative model. The proton-impact excitation, ionization and charge exchanges were taken into account as well as the electron-impact processes, and local selective excitations by pulse laser were also considered. The programing was made to numerically solve the simultaneous differential equations for the populations of helium excited states up to the principal quantum number n=5.A set of numerical solutions of the temporal and spatial changes of the populations was obtained in a tokamak plasma, and the result was shown to be useful for study of the atomic processes in the particle beam. 2. The Stark-Zeeman patterns of a laser-induced fluorescence line of the helium atom in the particle beam were calculated, the Stark effect being due to the vxB electric field in the tokamak magnetic field. The forbidden excitation due to the Stark effect from the triplet meta-stable state was the subject of calculation. For the lithium particle beam the polarization of the laser- induced fluorescence arising from the corresponding forbidden excitation was also studied. 3. The recombination processes of the helium atom were also investigated on the basis of a collisional-radiative model.

数值研究了磁聚变等离子体诊断中中性粒子束中原子的碰撞辐射过程。为了对氦中性粒子束注入托卡马克等离子体的激发、电离和辐射过程（包括激光诱导荧光）进行数值研究，建立了一组基于碰撞-辐射模型的速率方程。考虑了质子碰撞激发、电离和电荷交换过程，以及电子碰撞过程，并考虑了脉冲激光的局域选择激发。编制了数值求解主量子数n= 5的氦原子激发态布居的微分方程组的程序，得到了托卡马克等离子体中氦原子布居的时空变化的数值解，其结果对研究粒子束中原子过程有一定的参考价值。2.计算了氦原子在粒子束中的激光诱导荧光谱线的斯塔克-塞曼花样，斯塔克效应是由于托卡马克磁场中的V_xB电场引起的。由于三重态亚稳态的斯塔克效应的禁止激发是计算的主题。对于锂粒子束，研究了由相应的禁戒激发引起的激光诱导荧光的偏振。3.在碰撞辐射模型的基础上研究了氦原子的复合过程。