托卡马克电场漂移电子注入的物理分析研究

Physical analysis of electron injection by electrical drift in Tokamak

对电场漂移电子注入中的电子束物理、电子注入情况下托卡马克等离子体的平衡、电子注手器中的物理问题等进行了分析研究。结果表明，漂移电子束的稳定条件是外加电场必须大于电子束本身所产生的电场；为了保持等离子体环的平衡，外加电压愈低愈好；阴极的工作温度在800—1000K之间就可以满足在HT－6M托卡马克上进行该实验的要求；在采取必要的绝缘措施后，对25kV的设计电压，电子注入器的绝缘度是有保证的。

In this paper, electron beam physics, equilibrium of plasma in Tokamak under electron injection and physical problems involved in the electron injector were analytically studied. The result indicates that the electron beam will be stable when intensity of added electrical field is larger than that of beam's electrical field. For maintaining the equilibrium of plasma in Tokamak it is better to set the intensity of added field as low as possible. The working temperature of cathode between 8001000K will meet the requirement for experiment on HT--6M Tokamak. By using some insulation measures the injector should be workable and safe under a voltage of 25kV.