Basic Investigations on the New Acceleration Scheme with Large Amplitude Electron Plasma Waves

大振幅电子等离子体波加速新方案的基础研究

基本信息

批准号：
62460216
负责人：
NISHIDA Yasushi
金额：
$ 4.8万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Large amplitude electron plasma waves are excited, when a high power microwave is irradiated to the nonuniform plasma with a static magnetic field. In this scheme, it is aimed to investigate the interactions between an electron beam and electron plasma waves under the effects of VpxB acceleration mechanism. In the fiscal year of 1987, we devoted to the design and construction of new system of experimental apparatus, and in that of 1988, we have performed the experimental investigations. For this purpose, we have made an electron-beam gun with a small size (diameter:3 cm, maximum acceleration voltage:500V, maximum beam current:300mA), which is settled in the overdense region for a resonance absorption of the electromagnetic wave. In the present stage, we have almost finished the experimental work for the first phase, and several new phenomena have been clarified.1. When there is no magnetic field (B=0), precise investigations revealed that the interactions between electron plasma waves and an electron beam occured resonantly at Vp Vb under the controlled conditions and the mechanism for the particle trapping and its conditions are clarified.2. When there is a static magnetic field, the VpxB acceleration scheme is formed and an efficient acceleration of electron beams are observed. In this case, a strong interacton also occurs at Vp Vb and the electron beams are accelerated 2.5-3 times of the initial injection energy.We also constructed to demonstrate a new type electron linear accelerator which does not employ the plasma, but is based on the VpxB acceleration system. The experimental result shows more efficient and stable acceleration of electrons compared with a conventional linear accelerator.

当高功率微波炉用静态磁场照射到非均匀的等离子体时，大振幅电子血浆波会激发。在此方案中，旨在研究VPXB加速机制的影响下电子束和电子等离子体波之间的相互作用。在1987年的财政年度，我们致力于设计和构建新的实验设备系统，并在1988年进行了实验研究。为此，我们制造了一个具有较小尺寸的电子束枪（直径：3厘米，最大加速度电压：500V，最大束电流：300mA），该枪位于过度密度区域，以吸收电磁波的共振吸收。在目前的阶段，我们几乎完成了第一阶段的实验工作，并且已经澄清了几种新现象。1。当没有磁场（B = 0）时，精确的研究表明，在受控条件下，电子等离子体波和电子束之间的相互作用在VP VB处共响，并且颗粒捕获及其条件的机制阐明了2。当存在静态磁场时，会形成VPXB加速度方案，并观察到电子束的有效加速度。在这种情况下，在VP VB处也发生了强相互作用，并且电子束在初始注入能量的2.5-3倍加速。我们还构造了用于展示不使用等离子的新型电子线性加速器，但基于VPXB加速度系统。与常规线性加速器相比，实验结果显示了电子的效率更高和稳定。