Characteristics of High Z Materials as A plasma Facing Material

(1)用气体充注法对氢气的扩散和渗透进行了研究，精确地确定了扩散系数和扩散系数。(2)利用氢原子，研究了氢的反射和滞留以及渗透和扩散。结合高能注氢，详细分析了高Z金属的氢循环特性，为今后高Z金属在聚变反应堆中的应用提供了参考。(3)分析了高能氢离子轰击下反射氢原子的α辐射。从多普勒频移和增宽的角度，确定了Halpha发射的详细机理。(4)在德国尤利希KFA的中型托卡马克等离子体实验装置TEXTOR上进行了高Z （Mo和W）限制器试验。研究了高Z杂质从限制器的释放、高Z杂质对主等离子体的影响、高Z杂质在刮擦等离子体中的行为等问题。根据国际能源署的合同，结果由国际上的许多科学家进行分析。利用高Z材料作为等离子体表面材料，目前正在产生各种新的和有意义的结果。

(1) Hydrogen diffusion and permeation study has been done with using a gaseous charging method and both coefficients of diffusion and diffusion are precisely determined.(2) With using hydrogen atoms, hydrogen reflection and retention as well as permeation and diffusion, have also been studied. Refferring high energy hydrogen injection, hydrogen recycling properties of high Z metals are analyzed in detail for future use of the high Z in a fusion reactor.(3) Halpha emission from reflected hydrogen atom under energetic hydrogen ion bombardment is analyzed. From Doppler-shift and -broadening detailed mechanism of the Halpha emission is determined.(4) High Z (Mo and W) limiter test has been carried out in TEXTOR,which is a medium size tokamak plasma experimental apparatus at KFA,Julich in Germany. Various subjects, such as, the release of high Z impurity from the limiter, the influence of high Z impurities on main plasma, the behavior of high Z impurities in scrape-off plasma and so on, have been examined. And the results are analyzed by many scientists internationally under an IEA contract. Various new and informative results are now beeing produced for the utilization of high Z materials as a plasma facing material.