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

MRI：开发用于 MR-CAT 光束线的谐波抑制光学系统

• 批准号: 0420776
• 负责人: Carlo Segre
• 金额: --
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0420776&HistoricalAwards=false
• 关键词: MRI; Development; Harmonic; Rejection; Optical

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.

该奖项来自主要研究仪器项目，支持伊利诺伊理工学院构建晶体光学谐波抑制系统。该系统用于先进光子源（APS）的材料研究协作访问小组（MR-CAT）的波动束线。该系统配备了不同的光学器件，被称为“光束清洁器”，将增强我们目前的反射镜系统在低能量（低于30keV）下的谐波抑制，为中等能量（30keV至45keV）的x射线吸收光谱实验提供谐波抑制，并为衍射和对分布函数实验提供极高能量（高达80keV）的无谐波通道。该系统的设计是由于需要使校准像改变能量一样常规，在聚焦镜中下降或在不同的检测器中滚动。此外，在扫描主光束线单色仪进行x射线光谱学实验时，适当的设计可以减少垂直光束运动。该仪器，在其三种模式中的一种，将在MR-CAT上完成的几乎所有实验中找到应用，使得目前困难的实验，需要长时间的校准或使用专用光束线，MR-CAT设施的用户可以访问。主要研究仪器项目支持伊利诺伊理工学院建设一个晶体光学谐波抑制系统。该仪器将进入先进光子源的材料研究协作访问小组（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射线的能量、聚焦或探测器的种类一样，以适应手头的材料和实验。该仪器的关键部件是运动台和“光束清洁器”带通光学元件，它们利用了Si和Ge单晶强弯曲的良好反射率和对准特性。该装置与MR-CAT光谱和粉末衍射光束线的结合，包括所安装的微聚焦能力，将通过改善中等高能量（30keV） x射线吸收光谱实验的信噪比，在任何能量的光谱实验中产生几乎固定的出口光束，并在波动光束线上实现实用的高能对分布函数（PDF）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。