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我们利用高速、高时空分辨率面成像CCD相机在HL-1M弹丸注入方向上对弹丸的消融全过程进行了观测,拍摄到了HL-1M等离子体中注入氢弹丸时的H_α辐身照片。 弹丸与等离子体的相互作用是十分复杂的过程,大致可以分为两个阶段:第一阶段弹丸表面被加热而升华;第二阶段是蒸发、消融,之后弹丸被中性气体所包围,形成云。其消融率为其中,n_e/cm~(-3)为电子密度,T_e/eV为电子温度,r_p/cm为弹丸半径,M_i为弹丸质量(原子单位)。
We observed the whole process of projectile ablation in the direction of HL-1M projectile injection using a CCD camera with high speed and high space-time resolution. We took a photograph of H_α radiation when hydrogen projectile was injected into HL-1M plasma. The interaction between projectile and plasma is a very complicated process. It can be divided into two stages: the first stage is heated and sublimated, the second stage is evaporation and ablation, and then the projectile is surrounded by neutral gas to form cloud . The ablation rate is where n_e / cm ~ (-3) is the electron density, T_e / eV is the electron temperature, r_p / cm is the projectile radius, and M_i is the projectile mass (atomic units).