MRI: Development of a Harmonic Rejection Optical System for the MR-CAT Beamline

该奖项来自主要研究仪器计划，支持伊利诺伊理工学院建造晶体光学谐波抑制系统。该系统是材料研究合作访问小组（MR-CAT）在先进光子源（APS）波荡器光束线。该系统配备了不同的光学器件，称为“光束清洁器”，将增强我们目前的反射镜系统在低能量（低于30 keV）的谐波抑制，为X射线吸收光谱实验提供谐波抑制在中间能量（30 keV至45 keV），并为我们提供无谐波访问非常高的能量（高达80 keV）衍射和对分布函数实验。该系统的设计是由需要使调整作为例行改变能量，下降在聚焦镜或滚动在不同的检测器。此外，该仪器的适当设计将减少垂直光束运动的主光束线单色器扫描的X射线光谱实验。该仪器，在其三种模式之一，将发现在几乎所有的实验中做的MR-CAT的应用程序，使什么是目前困难的实验，需要长的对准时间或使用专用光束线访问用户的MR-CAT facility.The主要研究仪器计划支持伊利诺伊理工学院与建设的晶体光学谐波抑制系统。该仪器将降落在先进光子源的材料研究合作访问小组（MR-CAT）实验站。该系统将允许常规地改变到达样品的X射线的特性，就像改变X射线能量、聚焦或检测器的种类以适应手头的材料和实验一样。该仪器的关键元件是一个运动台和"光束清洁器“带通光学器件，它们利用了Si和Ge强弯曲单晶的良好反射率和对准特性。该设备与MR-CAT光谱和粉末衍射光束线的组合，包括安装的微聚焦能力，将通过改善中等高能量（30 keV）下X射线吸收光谱实验中的信噪比来增强能力，在任何能量下产生几乎固定的出射光束用于光谱学实验，并制作实用的高能对分布函数（PDF）在波荡器束线处的测量。该仪器专门设计用于移动和快速安装在MR-CAT实验站的各个位置。

This award from the Major Research Instrumentation program supports Illinois Institute of Technology with the construction of a crystal optic harmonic rejection system. The system is for the Materials Research Collaborative Access Team (MR-CAT) undulator beamline at the Advanced Photon Source (APS). This system, outfitted with different optics, known as "beam cleaners", will enhance the harmonic rejection of our current mirror system at low energies (below 30keV), provide harmonic rejection for x-ray absorption spectroscopy experiments at intermediate energies (30keV to 45keV) and give us harmonic-free access to very high energies (up to 80keV) for diffraction and pair distribution function experiments. The design of the system is driven by the need to make alignment as routine as changing energy, dropping in a focusing mirror or rolling in a different detector. In addition, proper design of this instrument will reduce vertical beam motion as the primary beamline monochromator is scanned for x-ray spectroscopy experiments. This instrument, in one of its three modes, will find application in nearly all of the experiments done at the MR-CAT, making what are currently difficult experiments, requiring long alignment times or the use of a dedicated beamline accessible to users of the MR-CAT facility.The Major Research Instrumentation program supports Illinois Institute of Technology with the construction of a crystal optic harmonic rejection system. The instrument will drop in to the Materials Research Collaborative Access Team (MR-CAT) experimental station at the Advanced Photon Source. The system will permit to change routinely the characteristics of the x-rays reaching the sample, just as one change the x-ray energy, focusing or kinds of detectors to suit the material and experiment at hand. The key elements of the instrument are a kinematic table and ``beam cleaner'' band pass optics which take advantage of the favorable reflectivity and alignment properties of strongly bent single crystals of Si and Ge. The combination of this device with the MR-CAT spectroscopy and powder diffraction beamline, including the installed microfocusing capability, will enhance the capabilities by improving the signal to noise in x-ray absorption spectroscopy experiments at moderately high energies (30keV), produce a nearly fixed exit beam for spectroscopy experiments at any energy and make practical high energy pair distribution function (PDF) measurements at an undulator beamline. The instrumentation is specifically designed to be moved and rapidly installed in various locations in the MR-CAT experimental station.