氢等离子体特性及其对钨的辐照行为研究

本文依托四川大学直线等离子体装置(SCU-PSI)产生高通量氢等离子体，采用朗缪尔探针对氢等离子体特性进行诊断，研究了氢等离子体特性随放电电流、气体流量等输入条件的演变规律；并利用调控产生的氢等离子体对纯钨进行了相应的辐照研究. 实验结果显示, 在磁场0.1~0.2 T、气流量1 000~2 200 sccm和电流180~228 A范围内，氢等离子体通量密度、热负荷密度及电子密度、温度等参数与磁场和电流呈正相关关系，而与气体流量呈负相关关系. 在该范围内，最高等离子体密度达到2.6×1019 m-3，等离子体通量达到8.8×1022 m-2?s-1，热负荷达到6.5×104 W/m2. 利用调控产生的等离子体对纯钨样品进行初步辐照实验，结果显示随着入射等离子体特性的不同，样品表面出现不同程度的尺寸和密度不均匀颗粒状辐照损伤结构，并且颗粒尺寸随氢等离子体离子通量的增加而增大. 本文结果显示SCU-PSI可以产生理想的氢等离子体环境，因此可以作为未来聚变领域，研究氢等离子体和托卡马克装置面向等离子体材料钨以及相应结构材料相互作用的有效实验装置.

Investigation of hydrogen plasma and its irradiation behavior on tungsten

The developmental rules of hydrogen plasma properties with the changes of discharging current, magnetic field and gas flow were studied using the facility of Sichuan University Plasma Surface Investigation (SCU-PSI). The performance of regulated plasma was characterized by Langmuir double probes and the irradiation of pure tungsten under above plasma environment was researched. The experimental results show that, in the range of magnetic field 0.1~0.2 T, gas flow 1 000~2 000 sccm and discharging current 180~228 A, the electron temperature and density are positively correlated with magnetic field and current and discharging current, and negatively correlated with gas flow. And the greatest electron density, the flux density and the heat load obtained are 2.6×1019 m-3, 8.8×1022 m-2?s-1, 6.5×104 W/m2, respectively. In the irradiation experiment of pure tungsten using above achieved hydrogen plasma environment, the particle was found due to the irradiation damage and the scale of particles increased with the increase of plasma flux. Therefore, from this paper, it reveals that the SCU-PSI could produce satisfied plasma environment and could be used as the effective facility to study the interaction between hydrogen plasma and plasma facing materials, like tungsten, in Tokamak device of the field of nuclear fusion.