共查询到19条相似文献,搜索用时 140 毫秒
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目前,北京同步辐射装置4W1A束线的双晶单色器存在着调节困难、单色光出口不固定等问题,本对其中原因进行了讨论,并提出一种新型结构的双晶单色器。此单色器具有调节简单、波长切换方便等优点,并实现了单色光固定出口。从而能够大大缩短调光时间,提高4W1A束线专用光的用光效率。 相似文献
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结合Fensnel反射系数公式与Nevot-Croce模型,设计出了可以用于同步辐射单色器的W/B4C周期多层膜,并对其光学性能(反射率)做了模拟计算。采用高真空磁控溅射技术,实现不同周期的W/BaC周期多层膜的制备。利用英国BEDE公司出产的D1高分辨X射线衍射仪,完成W/B4C周期多层膜周期结构的测量。在北京同步辐射荧光束线(4W1B)上,利用W/B4C多层膜获取准单色光,实现材料的荧光分析实验。实验结果证明,W/B4C多层膜对同步辐射白光起到了单色的作用,可以得到高强度的准单色同步辐射X射线。 相似文献
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本在分析了北京同步辐射室4B9B原束线低能分支的构造及弊病后,在不影响束线高能分支性能及总体机械结构的基础上提出了改进方案。中不仅详细介绍了该设计方案,同时也介绍了97年4月份专用光开始前夕的调试工作及出光后束线的性能测试工作,测试结果完全符合设计要求。该束线在这次同步辐射专用光实验中充分发挥了改进后的优势,取得了令人满意的结果。 相似文献
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北京同步辐射3B1束线软X射线光源及探测器灵敏度标定 总被引:8,自引:0,他引:8
本文简单介绍了北京同步辐射装置3B1束线软X测量装置的结构与概况,从单色器能量分辨,绝对光子能及出射光强线性三个方面对该装置光源特性进行了系统的研究,初步建立了标定用辐射场,并为用于惯性约束聚变的软X射线探测器进行了灵敏度标定,得到比较理想的结果。 相似文献
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《核技术》2015,(5)
快速扫描X射线精细结构谱(Quick-scanning X-ray Absorption Fine Structure,QXAFS)是测定特定吸收原子近邻环境结构的一个强有力的工具,已广泛应用在固体物理、催化剂和蛋白质分子等领域。双晶单色器(Double Crystal Monochromator,DCM)是上海光源XAFS光束线站的关键设备,它能够将一定波长范围内的白光单色化,并将单色光束稳定出射至下游光学元件。上海光源XAFS光束线站数据采集程序是在Lab VIEW环境下开发的,而其采用了步进电机的DCM控制系统则采用了基于分布式控制的实验物理及工业控制系统(Experimental Physics and Industrial Control System,EPICS)。由于运行环境不同,两者在装置联动时不可避免存在网络延时的缺陷并使得XAFS谱发生变形和不连续的问题。在EPICS环境下产生硬件触发信号并用其同步采集电离室和步进电机的信号,实现QXAFS数据的实时采集与控制。对标准铜箔样品进行了实验测试,结果表明该方法不仅可以保证系统获得较高的信噪比,而且可以在小于8 s的时间内获取一个完整的QXAFS谱,在小于500 ms时间内获得一个近边结构谱。该系统的实现对上海光源开展快速时间分辨的QXAFS实验具有重要的应用意义。 相似文献
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The micro-imaging station of the TopoTomo beamline at the ANKA synchrotron light source 总被引:1,自引:0,他引:1
A. Rack T. Weitkamp S. Bauer Trabelsi A. Cecilia T. Rack R. Simon M. Schulz A.N. Danilewsky W. Diete B.R. Müller 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(11):1978-1988
The TopoTomo bending magnet beamline at the ANKA synchrotron facility in Karlsruhe (Germany) operates in the hard X-ray regime (above 6 keV). Recently, an X-ray micro-imaging station has been installed at TopoTomo. For typical imaging applications, a filtered white beam or from 2009 on a double-multilayer monochromator is used. In order to optimize the field of view and the resolution of the available indirect pixel detectors, different optical systems have been installed, adapted, respectively, to a large field of view (macroscope) and to high spatial resolution (microscope). They can be combined with different camera systems, ranging from 14-bit dynamic range CCDs to fast CMOS cameras. The spatial resolution can be brought substantially beyond the micrometer limit by using a Bragg magnifier. Due to the moderate flux of the beamline compared to insertion-device beamlines on third generation light sources, special emphasis has been put on the efficiency of the detectors via a dedicated scintillator concept. The layout of the beamline optics makes optimal use of the coherence properties. Thus, absorption contrast, phase-contrast and analyzer-based imaging can be applied. Additionally, white beam synchrotron topography is performed, using digital indirect X-ray pixel detectors as well as X-ray film. 相似文献
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The variable-included angle plane-grating monochromator is a homemade key equipment of the scanning transmission X-ray microscopy (STXM) beamline at Shanghai Synchrotron Radiation Facility (SSRF).Monochromatic light of various wavelengths is achieved by an effective control system that handles the rotation of the plane mirror and plane grating mounted in a high vacuum chamber.M511.DDB made by PI Corp.is used as motion stage which has a DC servo motor controlled by a C862 controller based on RS232 protocol.The software platform of STXM is EPICS,so the local control functions are implemented by LabVIEW program to satisfy physics control.For the remote control functions,the program is integrated into EPICS with ShareMemoryIOC.Experimental tests show that the repeat precision of motion control is less than 0.2μm,which meets the control demand. 相似文献
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介绍国家同步辐射实验室光源二期工程圆二色与光声光谱光束线。该光束线采用一种改进的正入射型单色器,包括一块柱面前置镜、柱面光栅,无入射狭缝。前置镜接收 40mrad × 8mrad的同步辐射光,并将它在水平方向聚焦于样品处。柱面光栅(两块,覆盖100-300nm)完成同步光的单色化并将它在垂直方向聚焦于出射狭缝,出缝固定。该设计具有高通量(其光子通量为1012-1013photon/s)、中等分辨率(0.3-5nm)、保持线偏振等优点。使用带 LiF或 CaF2窗的超高真空阀门将光束线和实验站分隔,光束线工作在超高真空状态。 相似文献
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《核技术(英文版)》2015,(2)
A monochromator is important to a beamline for desired monochromatic light. There are three water-cooled double crystal monochromators(DCMs) commissioned in the phase-I beamlines of Shanghai Synchrotron Radiation Facility(SSRF). In this paper, the mechanical principle of the DCMs is introduced. A control system for the monochromator based on the standard architecture for SSRF beamlines is described. To achieve the control requirement precisely, the hardware includes VME(Versa Module Eurocard)-based controller for stepper motors, RS-232-based controllers for micropositioning and piezoelectric actuators. The software is developed with EPICS(Experimental Physics and Industrial Control System) package. Test results have revealed the stability and reliability of the system. 相似文献
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M. WATANABE 《核技术(英文版)》2006,17(6):354-369
The basic concept of synchrotron radiation beamlines for vacuum ultraviolet and X-ray experiments has been introduced to beginning users and designers of beamlines. The beamline defined here is composed of a front end, pre-mirrors, and a monochromator with refocusing mirrors, which are connected by beam pipes, providing monochromatic light for the experiments. Firstly, time characteristics of the synchrotron radiation are briefly reviewed. Secondly, the basic technology is introduced as the fundamental knowledge required to both users and designers. The topics are photoabsorption by air and solids, front ends and beam pipes, mirrors, monochromators, and filters. Thirdly, the design consideration is described mainly for the designers. The topics are design principle, principle of ray tracing, optical machinery and control, and vacuum. Fourthly, polarization control is considered. The topics are polarizers, polarization diagnosis of beamline, and circularly-polarized light generation. Finally, a brief summary is given introducing some references for further knowledge of the users and the designers. 相似文献
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随着同步辐射光束线技术的发展,单色器的分辨率越来越高,采用的复杂机构要求极高的机械转动和直线运动精度,对光束线控制软件的性能提出了新的要求。另一方面,同就辐射实验室新建光束线的数量逐渐增多,对控制软件设计的压力增大,希望有一种可移植的、标准化的控制软件。变包含角球面光栅单色器使用分层控制技术,层之间用以太网联接。底层是硬件抽象层,直接处理与所有硬件有关操作;上层为高级用户界面层,提供用户控制的指今,可以满足不同用户端软件的需求。同时还介绍了一种变包含角光栅单色器的数值解法。 相似文献