Excitation of Large Amplitude Electron Plasma Wave by Means of Wakefield with High Power Microwave

本研究的目的是：（1）利用高功率电磁波韦克菲尔德方法激发大振幅电子等离子体波;（2）等离子体中波与粒子之间的非线性、强相互作用;（3）阐明其方法中的电子加速机制。针对上述任务，我们进行了研究，得到了以下两个结果：（1）微波-非均匀等离子体相互作用共振吸收层附近观察到的高能电子束团形成马赫锥结构和离子波韦克菲尔德等新现象。这里，高能电子聚束是由电子等离子体波韦克菲尔德产生的。时间等离子体波回波也被发现后，超过25年前的理论预测的第一次。(2)对离子波韦克菲尔德激发和离子加速进行了精确的研究，阐明了相互作用机理。(3)为了从根本上理解等离子体基高能粒子加速器，精确地研究了高能电子束团（-20 MeV）与等离子体之间的强相互作用。(4)已经尝试了用于等离子体工艺或基于等离子体的粒子加速器的片状新等离子体源的开发。(5)基于VpxB原理的TE模电磁波电子直线加速器研制成功;（6）利用VpxB加速逆过程的VpxB行波放大器研制正在进行中。

The objectives of the present investigations are :(1)Excitation of large amplitude electron plasma wave by means of wakefield method with high power electromagnetic waves, (2)Nonlinear, strong interaction between waves and particles in plasma, and (3)Clarification of the electron acceleration mechanism in its method.For the tasks mentioned above, we have done investigations to get results both of, (1) new phenomena including Mach-cone structure formed by high energy bunch of electrons and ion wave wakefield observed near the resonance absorption layr of microwave-nonuniform plasma interaction. Here, high energy electron bunch is produced by an electron plasma wave wakefield. Temporal plasma wave echoes are also found for the first time after the theoretical prediction of more than 25 years ago. (2) Ion wave wakefield excitation and ion acceleration have been investigated precisely to clarify the interaction mechanism. (3) Strong interaction between high energy electron bunch (- 20 MeV) and plasmas has been investigated precisely for the fundamental understanding of plasma based high energy particle accelerators. (4) Development of sheet shaped, new plasma sources for the plasma process or plasma based particle accelerators has been tried. (5) the development of an electron linear accelerator based on the VpxB principle with TE-mode electromagnetic wave has been carried out successfully, and (6) the development of VpxB traveling wave amplifier, which uses inverse process of VpxB acceleration, is under way.