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Measurement of an electron bunch and establishment of the intense mm wave light source with the coherent radiation

电子束团测量及相干辐射强毫米波光源的建立

基本信息

批准号：
11680517
负责人：
OKUDA Shuichi
金额：
$ 2.11万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680517/
关键词：
Coherent radiation Electron bunch Electron linac mm wave light source

项目摘要

The coherent radiation from high-energy short electron bunches has a continuous spectrum in a submillimeter to millimeter wavelength range. In this work a new high-brightness millimeter wave light source has been established by using the coherent radiation.The spectra of the coherent transition radiation from the intense beam of the ISIR electron linac have been measured with an interferometer and far-infrared light detectors, silicon bolometers. The electron bunch shape has been evaluated from the results. The monitoring system for the fine structure of the electron bunch shape has been established. The operational conditions of the linac have been optimized so as to obtain stable and intense radiation. The coherent transition radiation has been transported out from the accelerator room. This is the first system established for the absorption spectroscopy with a grating spectrometer.The peak and the averaged power of the radiation are more than five and more than one order of magnitude higher than those of the other light sources, respectively. The intense light source can be applied to the absorption spectroscopy of matters with relatively strong absorption and to investigating nonlinear effects.Absorption spectroscopy has been performed for N_2O gas, which is a standard material for the far-infrared spectroscopy. Measurements have been also carried out for water samples having strong absorption and the temperature dependence has been investigated. The wavelength resolution is 1%. These are the first results which have been obtained by using a grating spectrometer. Pulse radiolysis experiments have been also performed. The future wide-range applications of the light source are expected.

来自高能短电子聚束的相干辐射在亚毫米到毫米波长范围内具有连续光谱。本文利用相干辐射建立了一种新的高亮度毫米波光源，用干涉仪和硅测辐射热计测量了ISIR电子直线加速器强流束的相干跃迁辐射谱。从结果中评价了电子束团的形状。建立了电子束团形状精细结构的监测系统。优化了直线加速器的工作条件，以获得稳定而强的辐射。相干跃迁辐射已经从加速器室中传输出来。这是第一个用光栅光谱仪建立的吸收光谱系统，其辐射峰值和平均功率分别比其它光源高5个和1个数量级以上。强光源可用于吸收较强物质的吸收光谱和非线性效应的研究，并对远红外光谱标准物质N_2O气体进行了吸收光谱研究。还对具有强吸收的水样进行了测量，并研究了温度依赖性。波长分辨率为1%。这是用光栅光谱仪获得的第一个结果。还进行了脉冲辐解实验。对该光源的广泛应用前景进行了展望。