波驱动等离子体电流的特征

本文指出,只当u=ω/(k_xv_e)≤2—2.5时,波驱动的电流以共振电子电流为主,波的耗散机制也主要是共振阻尼效应;而当u≥3时,非共振电子电流一般将超过共振电子电流,碰撞耗散也将大于共振耗散。波驱动电流所需功率较高,比相应欧姆功率大得多。这对反应器的设计带来困难,一般说来反应器中选取u≤2.5的共振电子电流较为合适。波驱动电流时将出现等离子体旋转,除环向旋转外,还将引起较大的角向旋转,后者伴有较大的径向电场。 关键词：

CHARACTERISTICS OF R. F. DRIVEN CURRENT

The characteristics of r.f. driven current are discussed. The results show thatonly for u=ω/(k_xv_e)≤2-2.5 the current is carried by the resonant electrons and thedissipative mechanism is the resonant damping. When u≥3 the current will be carried by the non-resonant electrons and the dissipative mechanism will be collision damping. The dissipative power is usually much higher than the Ohmic power and the Lawson condition can be satisfied only for the case of u≤2-2.5. It is also shown that in a r.f. driven tokamak the poloidal rotation of plasma and the correspondent radial electric field are important.