毛细管放电瞬态高热负荷对钨靶侵蚀损伤特性研究

The high-confinement mode (H mode) of Tokamak device will periodically explode edge localized mode (ELM) in the boundary region, generating transient high thermal load plasma to erode the first wall material. In this paper, capillary plasma is used to simulate the high thermal load of ELM and optimize the structure of three-electrode capillary. The heat load law of the capillary plasma is simulated and analyzed, and the heat load calibration relationship is proposed. Based on this, the high thermal load target impact test process is established and the research on the erosion characteristics of tungsten target plate materials under the effect of ELM equivalent thermal load is carried out. The erosion characteristics such as melting, cracking and sputtering of tungsten target under single and repeated frequency transient thermal load are obtained, and the threshold of cracking thermal load is 1.4 GW•m^-2. Based on the ductile-to-brittle transition temperature of tungsten, the physical mechanism of local deformation and residual stress accumulation of tungsten target under transient thermal load is analyzed. It is considered that the ablation is mainly caused by melting and sputtering caused by repeated thermal shock accumulation.