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PRODUCTION OF HIGH-BRILLIANT COHERENT X-RAYS BY THE MULTIPLE INTERFERENCE OF TRANSITION RADIATION

跃迁辐射多重干涉产生高亮度相干X射线

基本信息

批准号：
06554012
负责人：
IMANISHI Nobutsugu
金额：
$ 4.99万
依托单位：
KYOTO 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：
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/grant/KAKENHI-PROJECT-06554012/
关键词：
Resonant Transition Radiation Transition Radiation Multiple Interference High Brilliant X Rays Coherent X Rays Monochromatic Emission Angle Dependence Spectrometer 薄膜間共鳴放射角分布

项目摘要

The aim of the present research program is to establish a compact monochromatic high brilliant X-ray production method. For the purpose, we have studied the properties of resonant transition radiation (RTR) which is emitted when a relativistic charged particle crosses periodical boundaries of two different dielectric media. The following results are obtained :(1) We systematically measured energy spectra and emmision-angle dependence of X rays produced from Kapton- and single crystalline silicon-foils stacks at electron energies of 130 MeV and 1 GeV.The experimental results agree with ones calculated including X-ray absorption by the foils in an X-ray energy region of 2 to 20 keV.(2) It is concluded from the above fact that the RTR source can produce monoenergetic X rays with a brilliance of the order of 10^<12>/ (s・mrad^2・0.1%b.w.・mA) in the energy range from several to tens keV.(3) X rays produced from the source has discrete energy spectra and their energies can be tuned easily by changing the thickness and spacing of the foil-stacks. Therefore, we can supply RTR X rays directly from the source without using an X-ray monochrometor. The monochrometor is generally poor in the reflection efficiency of X-rays and easily damaged especially by soft X rays. The RTR X-ray source is specially effective for the pulse mode operation of a width of ps to fs, because a peak current of electrons can be increased keeping an average beam current to a low value which can be tolerable for the foil stack.The RTR X-ray sources will be applied in various research fields such as lithography, EXAFS,fluorescence X-ray analysis, angiography, because of the expected specifications of a brilliance of the order of 10^<12> photons/mm^2, a size of the beam of 1mm in diameter and an energy resolution of 1%.

本研究计划的目的是建立一种紧凑的单色高亮度X射线产生方法。为此，我们研究了相对论带电粒子穿过两种不同介质周期边界时的共振跃迁辐射(RTR)的性质。(1)系统地测量了电子能量为130 MeV和1GeV的Kapton单晶硅和单晶硅叠层产生的X射线的能谱和发射角关系。实验结果与包括X射线在2-20keV能区的吸收的计算结果一致。(2)根据上述事实，RTR源可以产生亮度为10^~lt；12~gt；/(S·Mrad^2·0.1%B.W.)的单能X射线。·mA)在几个到几十keV的能量范围内。(3)源产生的X射线具有离散的能谱，其能量可以很容易地通过改变箔堆的厚度和间距来调节。因此，我们可以直接从源提供RTR X射线，而不需要使用X射线单色仪。单色器对X射线的反射效率普遍较低，特别是在软X射线的作用下容易损坏。RTR X射线源对于宽度为ps到ps的脉冲模式操作特别有效，因为可以增加电子的峰值电流，使平均束流保持在箔堆可以容忍的低值。RTR X射线源将应用于各种研究领域，如光刻、EXAFS、荧光X射线分析、血管成像，因为预期的技术指标为亮度约为10^lt；12；光子/mm^2，光束直径为1 mm，能量分辨率为1%。