Far-Infrared Spectroscopy and Determination of Three-Dimensional Bunch Shape of Electrons by Coherent Transition Radiation

远红外光谱和相干跃迁辐射测定电子三维束形状

基本信息

批准号：
05554008
负责人：
IKEZAWA Mikihiko
金额：
$ 9.22万
依托单位：
TOHOKU 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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

We have investigated fundamental properties of coherent transition radiation that the spectrum intensity has been enhanced by six order of magnitude compared with the ordinary transition radiation and that the intensity is proportional to the square of the beam current of the linear accelerator. We also confirmed the importance of the role of the formation zone in the process of the radiation.We have constructed a system of far-infrared spectroscopy using the light source of the transition radiation from the electron beam of a linac of the Laboratory of Nuclear Physics, Tohoku University (Tohoku Linac) . We have observed the transmission spectra of As_2S_3 and As_2Se_3 glass specimens in the wavelength region from 1 to 5 mm with the accuracy of 3 %. We have also constructed a similar system of spectroscopy at the Research Reactor Institute, Kyoto University. We were able to observe the transmission spectra of NaCl crystals doped with hydroxylions in the millimeter wave region from 1 to 5 mm.We have determined the distribution function of electrons in the bunch for the electron beam of Tohoku Linac as a nearly Gaussian curve with the half width of 0.28mm. The distribution function of KURRI linac was determined as a quadratic function with the half width of 9 mm. The longitudinal distribution function of the linac of Osaka University had a triangular shape with the half width of 8.4 mm and the emittance of the beam was determined as (4.0 <plus-minus>2.0) x10^2mm・mrad. Compared with the conventional method of beam diagnosis, our method has advantages that it can determine the functional form of the distribution and that it has an extremely high resolution.

我们已经投资了相干过渡辐射的基本特性，即与普通的过渡辐射相比，光谱强度已通过六个数量级增强，并且强度与线性加速器的光束电流的平方成正比。我们还确认了形成区域在辐射过程中的作用的重要性。我们使用从Linac的电子束的光源构建了一个远红外光谱系统，我们观察到了AS_2S_3的传输光谱，并在1至5 mm的波长区域中构建了AS_2S_3和AS_2SE_3玻璃的传输光谱。我们还在京都大学研究反应堆研究所构建了类似的光谱系统。我们能够观察到1至5 mm的NaCl晶体在毫米波区域中掺杂的NaCl晶体的透射光谱。我们已经确定了Tohoku Linac的电子束在束中的电子分布函数，作为几乎高斯曲线的半宽度，其半宽度为0.28mm。 kurri linac的分布函数被确定为二次函数，半宽为9 mm。大阪大学利纳克的纵向分布函数的三角形形状为8.4 mm，梁的发射确定为（4.0 <plus-minus> 2.0）x10^2mm ・mrad。与传统的光束诊断方法相比，我们的方法具有确定分布的功能形式，并且具有极高的分辨率。