On the Spatial Features of the Instantaneous Angular Distribution of Synchrotron Radiation

Russian Physics Journal - The instantaneous angular distribution of synchrotron radiations is investigated. The radiation space is divided into two parts. The first part of the space is the...     

Evolution of the Angular Distribution of Circularly Polarized Synchrotron Radiation with Charge Energy

A complete investigation of the evolution of the angular distribution of circularly polarized synchrotron radiation with particle energy has been performed within the framework of the classical theory. To describe the familiar qualitative features of synchrotron radiation, exact quantitative characteristics have been introduced.     

Angular Distributions of Synchrotron Radiation in the Nonrelativistic Approximation

Russian Physics Journal - The angular distribution functions of the polarized components of synchrotron radiation in the nonrelativistic approximation are investigated using methods of classical...     

A Comparative Analysis of Angular Distributions of Synchrotron Radiation Calculated in the Context of Classical and Quantum Theories. Boson Radiation

With the development of the quantum theory of synchrotron radiation, its correspondence to the classical one has been investigated. However, up to now there has been no detailed comparison of the results of classical and quantum theories. The present work studies this problem. It gives the results of application of asymptotic methods to the quantum theory of synchrotron boson radiation. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 47–51, August, 2005.     

History of Synchrotron Radiation

Although natural synchrotron radiation from charged particles spiraling around magnetic-field lines in space is as old as the stars—for example, the light we see from the Crab Nebula—short-wavelength synchrotron radiation generated by relativistic electrons in circular accelerators is a modern phenomenon. The first observation—literally, since it was visible light that was seen—came at the General Electric Research Laboratory in Schenectady, New York, on April 24, 1947. In the 68 years since, synchrotron radiation has become a premier research tool for the study of matter in all its varied manifestations, as facilities around the world constantly evolved to provide this light in ever more useful forms.     

Synchrotron Radiation Facilities in China

Synchrotron radiation activities in China date back to the late 1970s. With the large increase of investment in science by the Chinese central government to promote the development of science and technology in China, quite a few large scientific projects were proposed by the scientific community, among which were Beijing Electron-Positron Collider (BEPC) and Hefei Synchrotron Radiation Light Source (HLS). The major aim of BEPC was for the studies of high energy particle physics with a parasitic synchrotron radiation facility, i.e., the so-called Beijing Synchrotron Radiation Facility (BSRF). It started operation in 1991 and became the first synchrotron radiation facility in China. As a parasitic facility, BSRF operated a few months a year and played an important role in fostering the synchrotron radiation user community in China. The HLS, a dedicated synchrotron radiation facility, came into operation almost at the same time as BSRF. As a lower energy synchrotron radiation facility, it aimed mostly at the applications of synchrotron radiation VUV wavelength range. Both BSRF and HLS were upgraded again due to strong demands from users. The rapid development of synchrotron radiation applications and facilities in the world in the 1980s and early 1990s spurred the great interest of Chinese scientists to build an advanced synchrotron radiation light source. A third generation light source was first proposed in mainland China in 1993 and was later shaped as the Shanghai Synchrotron Radiation Facility (SSRF) in 1995.     

Medical Applications of Synchrotron Radiation

Medical applications of synchrotron radiation range from infra-red spectroscopy to X-ray imaging and radiation therapy. In this issue we have chosen to highlight programs in the hard X-ray energy range where the imaging and therapy can potentially be carried out in vivo and in a clinical environment.     

同步辐射的相干模式

在分析了光源相干相体积的基础上，重点研讨了第三代同步辐射中波荡器（ｕｎｄｕｌａｔｏｒ）辐射的相干模式，能谱亮度，相干光子通量等，这对提高光束线相干能量的传输效率和软Ｘ光相干学束线的设计具有重要意义。     

Synchrotron and Undulator Radiation Experiments on the SIRIUS Synchrotron

This paper discusses the main results of synchrotron and undulator radiation experiments performed on the SIRIUS accelerator at Tomsk Polytechnical University. Some examples of the use of the SIRIUS synchrotron as a vacuum UV and soft-x-ray source for investigations in solid-state physics and for applied research are given.     

用同步辐射X荧光测量大鼠脑中微量元素的分布

采用同步辐射微探针技术研究了正常大鼠脑中的微量元素的分布,并给出了二维空间分布图.结果显示:Cl,Ca,Zn,主要集中分布在海马区,K,主要分布在海马和 皮层,而,Cu,的分布则相对无规律.元素的聚类分析结果表明,Cl,和,K,的分布相关性较好.由于同步辐射,X,荧光技术可以更直观地给出脑组织的二维元素分布, 因此这种方法可用于研究发生病变的脑中微量元素的变化.     

Synchrotron Radiation in a Circular Metallic Waveguide

We study theoretically the influence of a circular metallic waveguide with a longitudinal magnetic field on the synchrotron radiation of a point electric charge moving along a helical trajectory coaxial with the waveguide axis. The main attention is focused on the analysis of the energy characteristics of radiation of electromagnetic E and H waves. We derive the formulas for the radiation powers of E and H waves. It is shown that, under certain conditions, slowly moving electric charges do not radiate any of these electromagnetic waves in the circular waveguide.     

Topics in Coherent Synchrotron Radiation: Experimental Consequences of Radiation Impedance

Coherent synchrotron radiation (CSR) is now an established source of radiation in the terahertz region, with flux capabilities many orders of magnitude higher than conventional SR sources. Accordingly, CSR is playing an ever-increasing role in the field of Far-IR spectroscopy at synchrotron facilities around the world. However, with the improvement in spectroscopic resolution, the incident CSR spectra from several facilities are displaying intensity profiles that appear to be modulated by periodic peaks or deep indentations, while theory predicts a featureless distribution. After eliminating the usual suspects, like multiple reflections from windows, etc., one looks for a deeper explanation, such as the role played by the radiation impedance. This impedance is largely defined by the vacuum chamber in the region of the bend magnets, but probably with some effects from the straight sections as well.     

Synchrotron Radiation and Polymer Science IV

The fourth meeting on the use of Synchrotron Radiation in Polymer Science (SRPS) was held in Rolduc Abbey, the Netherlands, from September 8 to 11, 2009. This was a continuation of a topical series that was started by H.G. Zachmann, one of the pioneers of the use of synchrotron radiation techniques in polymer science. Earlier meetings were held in Hamburg (1995), Sheffield (2002), and Kyoto (2006). The meeting was organized as a satellite to SAS 2009, which took place the following week in Oxford. The meeting was co-organized by the polymer groups of Leuven University (Belgium) and Eindhoven University of Technology (Netherlands), as well as the DUBBLE beam line (ESRF/NWO/FWO).     

Early History of Synchrotron Radiation Research in Japan

The Japanese electron synchrotron started operation on December 15, 1961, with energy of 750 MeV at the Institute for Nuclear Study (INS) of the University of Tokyo, Tanashi. It was established as a joint effort of the entire Japanese community of high-energy physicists so that its use was announced as being open to all Japanese users from the start.     

Adventures with Synchrotron Radiation at Harvard

In the late 1950s, a 6 GeV electron synchrotron (the CEA) was being built at Harvard/MIT. Ed Purcell, who generally trafficked in volts (or maybe kilovolts), but never gigavolts, was thinking about what one could do with all that synchrotron radiation that otherwise would uselessly warm up the walls of the beamline (I remember well his student Roger Tsien's nice drawing of radiation from kinks in the outgoing E-field lines of an electron in relativistic circular motion; see Figure 1).     

同步辐射X射线干涉的实验研究

介绍在北京同步辐射装置上进行的国内首次LLL型X射线干涉实验研究,在X光底片上观察到了Moire干涉条纹,为进一步利用X射线干涉技术实现纳米测量打下了初步基础.     

深度同步辐射光刻初探

ＬＩＧＡ技术被认为是制作微机械最有前途的方法，而ＬＩＧＡ技术较为关键的一步是深度同步辐射光刻。报道了深度同步辐射光刻的进展，刻蚀出了外圆直径为３８μｍ～３９μｍ，叶长约８μｍ，高约２５μｍ的扇叶状微结构元件。     

二茂铁的同步辐射光电离

利用同步辐射和飞行时间质谱 ,研究了二茂铁的真空紫外光电离 ,得到了该分子的电离势为 (6 .78± 0 .0 5 )eV ,碎片离子FeC5H5+ 的出现势为 (13.4 0± 0 .10 )eV .根据实验结果 ,分析了二茂铁的主要光电离解离通道 ,估算了分子及离子的键解离能 .用密度泛涵的方法对该分子离子及一些主要的碎片离子进行了初步的量化计算 ,得到了二茂铁的电离势和一些碎片的出现势 .利用量化计算的数据还估算了分子及离子的键解离能 ,并与文献值进行了比较     

偶氮苯的同步辐射光电离研究

用同步辐射光电离质谱与符合技术的相结合测定了偶氮苯光电离效率谱，获得了该分子的电离势，导出了分子和分子离子中某些键的解离能以自由基Ｃ６Ｈ５Ｎ２的电离势。测得了不同光子能量激发下的质谱图，并对不同能量时偶氮苯的解离电离方式进行了分析。