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Development of Electron Linear Accelerator based on the VpxB Acceleration Scheme

基于VpxB加速方案的电子直线加速器的研制

基本信息

批准号：
03558001
负责人：
NISHIDA Yasushi
金额：
$ 11.26万
依托单位：
UTSUNOMIYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03558001/
关键词：
VpxB acceleration linear accelerator plasma based accelerator plasma wave echo short pulse microwave electron plasma wave ion plasma wave plasma wave wake field VpxB加速法

项目摘要

The primary task of the present investigation is to develop a plasma based electron linear accelerator, by exciting large amplitude electron plasma wave with high power, short pulse microwave. Specifically, the "VpxB acceleration scheme", which was found experimentally in our laboratory, should be employed, in addition to the large amplitude plasma wave wake field excited by the short microwave pulse. The above mentioned scheme should base on the variety of nonlinear phenomena occurring in the plasma, which also have to be investigated intensively.Last two years, we stepped out the first step toward the goal of developing the plasma based electron linear accelerator. We, however, have faced to serious technical problem which should be broken through very urgently. That is, the ultra-short, high power microwave pulse is required. The typical specifications follow, 1 nsec FWHM with 50-100 kW peak power at f= 2.86 GHz or 0.5 nsec FWHM 250-500 kW peak power at f = 9.5 GHz. The basic idea for this system is now under development in our laboratory, still we need much time for use in the experiments. This is one of the key issues for the next several years.We have found new phenomena such as large amplitude (deltan/n (] SY.gtoreq.[) 40 %) ion wave excitation by a short microwave pulse with typical pulse width of 70 nsec or less and an observation of temporal plasma wave echoes which has been expected for last 25 years after the first theoretical prediction in 1967.We have developed electron linear accelerators based on the VpxB scheme in vacuum for aiming to develop the compact, high efficiency, high acceleration gradient accelerators. We employed the longitudinal mode electro-magnetic wave produced by the disk shaped electrode for the delay circuit. The vertical static magnetic field is applied for making the VpxB scheme. We have succeeded to accelerate electrons in the above mentioned new scheme.

本课题的主要任务是利用高功率、短脉冲微波激发大振幅电子等离子体波，研制基于等离子体的电子直线加速器。具体来说，除了采用短微波脉冲激发的大振幅等离子体波尾迹场外，还应采用我们实验室实验发现的“VpxB加速方案”。上述方案应基于等离子体中发生的各种非线性现象，这些现象也必须深入研究。在过去的两年里，我们朝着开发等离子体电子直线加速器的目标迈出了第一步。然而，我们面临着迫切需要突破的严重技术问题。也就是说，需要超短、高功率的微波脉冲。典型的规格如下：1 nsec FWHM在f= 2.86 GHz时峰值功率为50- 100kw，或0.5 nsec FWHM在f= 9.5 GHz时峰值功率为250- 500kw。该系统的基本思想目前正在我们的实验室中发展，但我们还需要大量的时间来进行实验。这是未来几年的关键问题之一。我们发现了一些新的现象，如大振幅（delta /n）。[)典型脉冲宽度小于等于70秒的短微波脉冲激发离子波，并观测到等离子体波的时间回波，这是自1967年第一次理论预测以来，近25年来一直期待的。为了研制紧凑、高效、高加速度梯度的真空电子直线加速器，我们研制了基于VpxB方案的真空电子直线加速器。我们将圆盘形电极产生的纵模电磁波用于延时电路。VpxB方案采用垂直静磁场。我们已经在上述新方案中成功地加速了电子。