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Coherent X radiation from periodic materials

来自周期性材料的相干 X 辐射

基本信息

批准号：
06452072
负责人：
ENDO Ichita
金额：
$ 4.1万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452072/
关键词：
parametric x ray Resonant transition radiation monochromatic x-ray source

项目摘要

Various types of coherent x radiations from periaodic materials have benn known ; Parametric X-ray (PXR) , Channeling radiation, Resonant Transition Radiation, and have been studied in the former Soviet Union and other places. The present reasearch project have succeeded in accumulating systematic data which may enable us to understand the heretofore separately described radaiation phenomena in a more consistent way by making measurements under the conditions where two radiation phenomena can take place at the same time. Among the experimental consequences, the following points are to be underlined.1. The two dimentional angular distribution of PXR was successfully observed for the first time. The results indicated that there is no dip at the central point of the distribution which is expected by our Incoherent Model but that the absolute intensity is appreciably higher than any theoretical calculation.2. The effect of channeling is small at the electron energies 450 and 200MeV.3. A rapid increase of x-ray intensity was observed when we increase the number of monocrystalline foils placed in an electron beam. In particular, a quadratic increase was observed for the X rays detected at the Bragg angle by using inclined multi foils.The last phenomena found here may possibly used for developing an intense monochromaticd x-ray source. Further increase of X-ray intensity is expected for a special arrangement in which the electrons traversescrystalline multifoils many times.

周期性物质产生的各种相干X射线辐射，如参量X射线（PXR）、散射辐射、共振跃迁辐射等，在前苏联等地都有研究。本研究项目已成功地积累了系统的数据，这些数据使我们能够通过在两种辐射现象同时发生的条件下进行测量，以更一致的方式来理解迄今为止分别描述的辐射现象。在实验结果中，以下几点是要强调的。首次成功地观测到了PXR的二维角分布。结果表明，在分布的中心点没有我们的非相干模型所期望的倾斜，但绝对强度明显高于任何理论计算.在电子能量为450和200MeV时沟道效应较小。当我们增加放置在电子束中的单晶箔的数量时，观察到X射线强度的快速增加。特别地，用倾斜的多箔在布喇格角上探测到的X射线有二次增加的现象，这一现象有可能用于研制强单色X射线源。进一步增加的X射线强度是预期的一个特殊的安排，其中的电子transversecrystalline multifoils多次。