Basic Researches on Development of Plasma Accelerator

等离子体加速器研制的基础研究

基本信息

批准号：
59420045
负责人：
NISHIDA Yasushi
金额：
$ 8.32万
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 (A)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59420045/
关键词：
Plasma accelerator resonance absortion microwave VpxB acceleration 高エネルギー電子

项目摘要

In a weakly magnetized, inhomogeneous plasma ( <omega_0> <[]-> <omega_p> >> <omega_c> : <omega_o> is a frequency of an incident electromagnetic wave, <omega_p> the electron plasma frequency, and <omega_c> the electron cyclotron frequency), a large amplitude electrostatic wave propagating across the static magnetic field B accelerates electrons in the direction (-e)VpxB (VpxB acceleration mechanism). In the present research, it is aimed to clarify whether the VpxB acceleration mechanism is spplicable or not to the high energy particle accelrator scheme in order to accelerate electrons or ions. For those purposes, (1) we have performed the experiments on the microwave plasma interaction in a weakly magnetized inhomogeneous plasma, and (2) the basic ideas to realize a particle accelerator are proposed.When we applied the medium power microwave with frequency of 2.86 GHz and a maximum power 11 KW, hot electrons with maximum energy up to about 1 KeV have been observed through the process of VpxB acceleration mechanism. In addition, electrons with several 100 eV, which are also ejected in the direction perpendicular to both a wave propagation direction and the static magnetic field, are observed near the resonance absorption layer. This process is also expected to be the VpxB acceleration due to the wave trapped in the density cavity.Design studies are performed for realizing a high energy particle accelerator with the use of the slow wave structure and the concept of the VpxB acceleration scheme. It is clarified that in the relativistic case the present accelerator scheme is more efficient than the conventional linear accelerator.

在弱磁化的不均匀等离子体中（ <omega_0> <[]-> <omega_p> >> <omega_c> ：<omega_o> 是入射电磁波的频率，<omega_p> 是电子等离子体频率，<omega_c> 是电子回旋频率），穿过静磁场 B 传播的大幅度静电波沿 (-e)VpxB 方向加速电子（VpxB 加速机制）。本研究旨在阐明VpxB加速机制是否适用于高能粒子加速器方案以加速电子或离子。为此，（1）我们在弱磁化非均匀等离子体中进行了微波等离子体相互作用的实验，（2）提出了实现粒子加速器的基本思路。当我们应用频率为2.86的中功率微波时GHz，最大功率11 KW，通过VpxB加速机制观察到最大能量可达1 KeV左右的热电子。另外，在共振吸收层附近观察到也沿与波传播方向和静磁场两者垂直的方向射出的数100eV的电子。由于密度腔中的波被俘获，该过程也有望成为VpxB加速。利用慢波结构和VpxB加速方案的概念，进行了设计研究以实现高能粒子加速器。可以看出，在相对论情况下，本加速器方案比传统的线性加速器更有效。