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在 HL- 1M装置上最近改进后的超声分子束流加料实验中 ,发现边缘等离子体的 Hα线辐射信号沿大环方向呈现有序变化。在超声分子束注入口附近区域 ,Hα信号为长方形正脉冲 ,类似于分子束注入脉冲 ,而在远离注入口区域的边缘 Hα信号为负尖脉冲。在注入口附近区域 ,用静电探针测得的径向电子温度和密度在超声分子束注入期间分别下降和上升了一个数量级。CCD相机拍摄分子束与等离子体相互作用产生的 Hα 线辐射强度分布等实验结果表明 ,注入的“冷通道模型”可能是成立的。根据高压气体射流形成团簇的经验定标律Γ * =kd0 .85p0 / T2 .2 90 ,通常Γ * >10 0即有可能出现团簇。本实验中Γ* 的值约为 12 7,有可能形成团簇。分子束流中出现团簇有利于增加注入的深度。在超声分子束注入过程中呈现的新实验现象与团簇的联系有待进一步研究。
In the recently improved ultrasound molecular beam feed experiment on the HL-1M device, it was found that the Hα radiation signal of the edge plasma presented an orderly change along the macrocyclic direction. The Hα signal is a rectangular positive pulse in the vicinity of the ultrasonic molecular beam injection port, similar to the molecular beam injection pulse, and the Hα signal is a negative spike at the edge far from the injection port region. In the vicinity of the injection port, the radial electron temperature and density measured with the electrostatic probe decreased and increased an order of magnitude, respectively, during the injection of the ultrasound molecular beam. The experimental results of the radiation intensity distribution of Hα radiation generated by the interaction between molecular beam and plasma by a CCD camera indicate that the “cold channel model” injected may be established. According to the empirical law of formation of a cluster of high-pressure gas jets, Γ * = kd0 .85p0 / T2 .2 90, usually Γ *> 10 0 that clusters may occur. In this experiment, the value of Γ * is about 12 7, it is possible to form clusters. The presence of clusters in the molecular beam helps to increase the depth of implantation. The connection between the new experimental phenomena and clusters in the process of ultrasound molecular beam injection needs further study.