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Dynamic Process of Hydrogen Recycling at First Wall

第一壁氢气回收动态过程

基本信息

批准号：
03452303
负责人：
TANABE Tetsuo
金额：
$ 3.71万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
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

In order to investigate hydrogen recycling behavior at first wall of fusion reactor, dynamic process of hydrogen reflection, re-emission and permeation under hydrogen ion and atom bombardments are systematically investigated for various first wall candidate materials. Visible light emission from the target surface under the hydrogen ion bombardment is also analyzed spectroscopically. Employing Ar ion laser, in-situ laser Raman analysis is carried out to monitor damaging process of the irradiated surface.Results obtained are summarized as follows(1) H emission emitted by reflected hydrogen atom from target surface is found to be very useful for understanding hydrogen reflection from graphite and molybdenum.(2) Broad band emission from the surface of metallic target is observed and is attributed to be due to the impurity oxygen on the surface. Strong light emission is observed from ceramics originating from the color centers or impurities of the ceramics. The intensity of the emission quite dependent on the target condition. In the case of graphite target band emission from CH and CH_2 molecules is observed indicating H-C interaction. The present results clearly indicate that the ion induced photon (light) emission is a new technique for investigation of ion-solid interactions.(3) Damaging process of the graphite surface by hydrogen ion bombardment are examined by the in-situ laser Raman spectroscopy, which is very successful giving clear image for amorphizing process of the graphite by hydrogen ion bombardment.(4) Hydrogen reemission, retention and permeation at the first wall candidate materials are investigated using hydrogen molecules, atoms and ions and the effect of energy deposition of ion bombardment on hydrogen recycling is analyzed comparing the three cases.

为了研究聚变堆第一壁的氢循环行为，系统地研究了不同第一壁候选材料在氢离子和原子轰击下氢的反射、再发射和渗透的动态过程。对氢离子轰击下靶面的可见光发射进行了光谱分析。利用Ar离子激光对辐照表面进行了激光拉曼原位分析，结果表明：(1)靶表面反射氢原子发射的氢对理解氢在石墨和钼中的反射是非常有用的。(2)观察到金属靶表面的宽带发射，并将其归因于金属靶表面的杂质氧。从陶瓷中观察到来自色心或陶瓷杂质的强光发射。发射的强度在很大程度上取决于目标条件。在石墨的情况下，观察到CH和CH2分子的靶带发射，表明H-C相互作用。研究结果表明，离子诱导的光子(光)发射是研究离子-固体相互作用的一种新技术。(3)用激光拉曼光谱原位研究了氢离子轰击石墨表面的损伤过程，给出了氢离子轰击石墨的非晶化过程的清晰图像。(4)利用氢分子、原子和离子研究了氢在第一壁候选材料上的再发射、滞留和渗透，并对比分析了离子轰击能量沉积对氢回收的影响。