Study of atomic processes involving excited-atoms for new plasma diagnostics

在本研究计划中，我们研究了等离子体中涉及激发原子的原子过程，以了解聚变等离子体中的基本原子过程并开发新的等离子体诊断方法。在理论研究方面，我们开发了一个经典的轨道Monte Carlo模拟程序nCTMC，模拟了高电荷态离子与准氢原子的碰撞过程。nCTMC程序基于纯经典理论，但它非常灵活，可以应用于广泛的原子碰撞过程。利用该程序可以计算能量、截面等经典物理量。计算了高电荷态离子与氢原子和准氢原子的电子转移过程的总截面和微分截面。在实验研究中，我们研制了一种新的激发态原子源。本文研制了两种碱金属原子源。我们测量了高电荷态碘离子与基态碱金属原子（Na，K，Rb，Cs）碰撞的总电子转移截面。为了激发目标原子，我们使用半导体激光器。经过多次测试和验证，激发态原子源已基本完善，本研究项目所取得的多项成果可能为原子碰撞研究和等离子体物理中涉及激发态原子的原子过程研究开辟一个新的领域。

In the research project, we investigated atomic processes involving excited atoms in plasmas for understanding of fundamental atomic processes in fusion plasmas and developing of new plasma diagnostics. Especially, we focused on highly charged ion-excited atom collisions that occur most frequently in fusion plasmas.In theoretical studies, we developed a classical trajectory Monte Carlo simulation code, named nCTMC code, for the collisions of highly charged ions with quasihydrogenic atoms. The nCTMC code is based on pure classical theory, however it is very flexible and can be applied to wide range of atomic collision processes. By using this code, classical physical quantities, such as energy and cross section, can be obtained. We calculated total and differential cross section for electron transfer processes of highly charged ions with atomic hydrogen and quasihydrogenic atoms. Comparison of the results and available data were made.In experimental studies, we have developed a new excited atom source. Two kinds of alkali-metal atom sources were developed and used in the studies. We have measured total electron transfer cross sections of the collisions of highly charged iodine ions with ground-state alkali-metal atoms (Na, K, Rb, Cs). I order to excite target atoms, we use a semiconductor lasers. After many checks and tests, the excited atom source has been almost perfected.Many results obtained in the research project may open up a new field in atomic collision researches and plasma physics on atomic processes involving excited atoms.