It is suggested that the instability is excited in the lowdensityplasma when the electron beam drift velocities exceed the ion acoustic speed.
不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
2
A compact ECR plasma source, the strengths of which are its ultra low electron temperature, its low pressure and its ultra low density, was developed and built for such a simulator.