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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.

当高功率微波照射在静磁场作用下的非均匀等离子体时，会激发出大振幅的电子等离子体波。在该方案中，它的目的是研究在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财政年度，我们致力于设计和建设的新系统的实验装置，并在1988年，我们进行了实验研究。为此，我们制作了一个小尺寸的电子枪（直径3cm，最大加速电压500 V，最大束流300 mA），它被安置在过密区，用于电磁波的共振吸收。在现阶段，我们已经基本完成了第一阶段的实验工作，并且发现了一些新的现象.当无磁场（B=0）时，精确的研究表明，在控制条件下，电子等离子体波与电子束之间的相互作用在Vp B处发生共振，并阐明了粒子俘获的机制和条件.当有一个静态磁场时，形成VpxB加速方案，并观察到一个有效的加速电子束。在这种情况下，在Vp-Vb处也发生了强相互作用，电子束被加速到初始注入能量的2.5-3倍.我们还构造了一种新型的电子直线加速器，它不采用等离子体，而是基于Vp-xB加速系统.实验结果表明，与传统的直线加速器相比，该加速器对电子的加速效率更高、更稳定。