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在磁约束聚变等离子体装置中,面对等离子体的第一壁将直接影响高温等离子体性能及第一壁寿命,具有表面自我修复的、能有效抑制边界粒子再循环的液态金属锂第一壁越来越被重视,其中液态锂第一壁与等离子体相互作用的研究尤其重要.本文研究了HT-7装置液态锂限制器实验中锂的表面腐蚀及在装置内沉积特性、及其对等离子体性能影响.实验表明,当锂与等离子体相互作用较弱时,锂以微弱的蒸发及溅射形式从表面腐蚀并进入等离子体,表现为锂的线辐射有所增强,等离子体内杂质水平降低,氢再循环降低,有利于等离子体约束性能提高;当锂与等离子体间的相互作用比较强时,锂主要以锂滴形式直接进入等离子体,引起锂的辐射爆发,最终引发等离子体放电破裂.通过对锂斑及样品的分析发现,锂主要沉积在限制器周围,并且在低场侧及沿着等离子体电流方向沉积居多,表现为极向和环向分布不均匀,这也导致边界粒子再循环分布的不均匀.这些实验为研究液态锂第一壁与等离子体相互作用,分析液态锂第一壁在托卡马克装置上应用具有重要参考意义.
In a magnetic confinement fusion plasma device, the first plasma-facing wall will directly affect the high-temperature plasma performance and the life of the first wall, has a surface self-repairing liquid metal lithium first wall that can effectively restrain the boundary particles from recycling More and more attention has been paid to the interaction of the first wall of liquid Li with the plasma.In this paper, the surface corrosion of Li in liquid state and the deposition characteristics of the device in liquid lithium limiter HT-7 were studied, The experimental results show that when the interaction between lithium and plasma is weak, lithium etches from the surface into the plasma with weak evaporation and sputtering, which shows that the linear radiation of lithium is enhanced and the impurity level in the plasma is reduced , The hydrogen recirculation is reduced, which is beneficial to the plasma confinement performance. When the interaction between lithium and plasma is relatively strong, lithium mainly enters the plasma mainly in the form of lithium droplets, causing the radiation of lithium to burst and finally the plasma discharge to rupture From the analysis of the lithium spot and the sample, it was found that lithium is mainly deposited around the confinement and deposited on the low field side and in the direction of the plasma current Mostly in the distribution of polar and circumferential heterogeneities, which also led to the uneven distribution of the boundary particle recycling.These experiments to study the interaction of the first wall of the liquid lithium and the plasma, the analysis of the first wall of liquid lithium in the Tokamak The device has important reference meaning.