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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.

在弱磁化的非均匀等离子体中（<omega_0><[]-<omega_p>><omega_c>：<omega_o>是入射电磁波的频率、<omega_p>电子等离子体频率和<omega_c>电子回旋频率），在静磁场B上传播的大振幅静电波在方向（-e）Vpx B上加速电子（Vpx B加速机制）。本研究的目的是阐明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，我们进行了弱磁化非均匀等离子体中微波等离子体相互作用的实验研究，并提出了实现粒子加速器的基本思路：在频率为2.86GHz、最大功率为11 KW的中功率微波场中，通过VpxB加速机制的过程，已经观察到最大能量高达约1 KeV的热电子。此外，在共振吸收层附近观察到具有几个100 eV的电子，其也在垂直于波传播方向和静磁场两者的方向上射出。该过程也预计是由于密度腔中捕获的波而产生的VpxB加速。利用慢波结构和VpxB加速方案的概念，为实现高能粒子加速器进行了设计研究。澄清了在相对论情况下，本加速器方案比传统的线性加速器更有效。