Investigation of hydrogen plasma and its irradiation behavior on tungsten

Abstract:

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.