DEVELOPMENT OF HIGH BRILLIANT X RAY MICROBEAM BY A RESONANT TRANSITION RADIATION METHOD WITH A LOW ENERGY ELECTRON ACCELERATOR

低能电子加速器共振跃迁辐射法研制高亮度X射线微束

• 批准号: 10558079
• 负责人: IMANISHI Nobutsugu
• 金额: $ 4.1万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10558079/
• 关键词: Resonant Transition Radiation; High Brilliant X Ray Beam; X Ray Microbeam; Monochromatic X Ray Beam; Polarized X Ray Beam; Relativistic Electron; Emission Angular Distribution; Energy Spectrum; 高輝度X線源; 単色X線; 偏光

A high brilliant x ray microbeam has been developed by using a resonant transition radiation method with a low energy electron accelerator. The obtained results are as follows :(1) The brilliance of the resonant transition radiation (RTR) X rays with a photon energy of 5 ke V increases by a factor of 60 and gets to a value of about 1×10^<14> Photons/(s mrad^2 mm^2 0.1%b.w. mA) by the ellipsoidal type mirror. The surface roughness as large as 10 nm does not decrease the brilliance for the mirror.(2) The method of photoabsorption-edge transition radiation (TR) tuned by tilting a thin-foil stack produces quasimonochromatic X rays with an energy resolution of 10-50%.(3) An almost linearly polarized X ray beam has been produced first by extracting transition radiation X rays through a rectangular slit. The measured linearity of the polarization is higher than 90%.(4) The dynamical diffraction of TR wave emitted by a fast electron from in surface of a target may change essentially interference between this wave and that emitted from out surface of a crystalline target. This effect causes the manifestation of a dynamical TR peak with very narrow angular and spectral width. Characteristics of such peak were obtained.(5) The effect of anomalous Borrmann absorption can be observed in a relativistic particle TR from a crystal. The conditions of this predicted effect manifestation have been considered.(6) The optimal conditions of a relativistic particle PXR emitted along an emitting electron velocity have been discussed as well as the conditions of a dynamical TR peak observation.

采用低能电子加速器的共振跃迁辐射方法研制出了高亮度X射线微束。得到的结果如下：(1)通过椭球型反射镜，光子能量为5 ke V的共振跃迁辐射(RTR) X射线的亮度增加了60倍，达到约1×10^<14> Photons/(s mrad^2 mm^2 0.1%b.w. mA)。表面粗糙度大至10 nm并不会降低镜子的亮度。(2)通过倾斜薄箔叠层调谐光吸收边缘跃迁辐射(TR)的方法产生能量分辨率为10-50%的准单色X射线。(3)首先通过矩形狭缝提取跃迁辐射X射线产生几乎线偏振的X射线束。测得的偏振线性度高于90%。 (4)快电子从靶材表面发射的TR波的动态衍射可以本质上改变该波与从晶体靶材外表面发射的TR波之间的干涉。这种效应导致动态 TR 峰的表现具有非常窄的角度和光谱宽度。获得了该峰的特征。(5)在来自晶体的相对论性粒子TR中可以观察到反常鲍曼吸收效应。考虑了这种预测效果表现的条件。(6)讨论了沿发射电子速度发射的相对论性粒子PXR的最佳条件以及动态TR峰观测的条件。

项目成果

矢島千秋: "Generation of Linearly Polarized Transition Radiation X-Ray Beam"Nuclear Instruments and Methods A. 460. 227-232 (2001)

Chiaki Yajima：“线性偏振跃迁辐射 X 射线束的生成”核仪器和方法 A. 460. 227-232 (2001)

矢島千秋: "Narrow Peak Transition Radiation Produced by Dynamical Diffraction Effects in a Thin Crystal"Annual report of Quantum Science and Engineering Center, QSEC, Kyoto University. 12-14 (2000)

Chiaki Yajima：“薄晶体中动态衍射效应产生的窄峰跃迁辐射”京都大学 QSEC 量子科学与工程中心的年度报告 12-14 (2000)。

矢島千秋: "Linearly Polarized Transition Radiation X-Ray Beam"Annual Report of Quantum Science and Engineering Center, QSEC, Kyoto University. 1. 10-11 (1999)

Chiaki Yajima：“线性偏振跃迁辐射 X 射线束”，京都大学 QSEC 量子科学与工程中心年度报告，1. 10-11 (1999)。

矢島千秋: "Generation of Quasimonochromatic Resonant Transition Radiation X rays Using a K-Shell Photoabsorption Edge"Proceedings of the First Asian Particle Accelerator Conference. 695-697 (1998)

Chiaki Yajima：“使用 K 壳光吸收边缘生成准单色共振跃迁辐射 X 射线”第一届亚洲粒子加速器会议论文集 695-697（1998 年）。

K.Yajima, T.Awata, R.Koizumi, M.Imai, A.Itoh and N.Imanishi: "Generation of Coherent Transition Radiation"Proceedings of International Symposium on Environment-Conscious Innovative Materials Processing with Advanced Energy Sources. 249-258 (1998)

K.Yajima、T.Awata、R.Koizumi、M.Imai、A.Itoh 和 N.Imanishi：“相干跃迁辐射的产生”先进能源环保型创新材料加工国际研讨会论文集。