DETECTOR ARRAYS FOR SYNCHROTRON RADIATION RESEARCH

长期目标是发展能力， 能量色散X射线探测器的大阵列， 在同步辐射（SR）和其他 X射线研究设施。 每个数组元素都有 在6 KeV和计数率下，能量分辨率为300 eV或更好 能力超过50,000 cps。 已完成的数组，包含 或100个元素，可以以超过5x 10 -6 cps的速率计数 并且目标成本低于10万美元。 耦合到 下一代高亮度SR X射线源，这些 阵列将导致一个大大增强的能力，以获得 直接的结构信息，已被发现是如此 有助于揭示蛋白质和 酶在分子水平上起作用。 这些阵列可能是 线性组织，如衍射检测器，或 2-XANES和EXAFS的荧光检测器。 预计增加的反渗透能力和立体角 收集效率将使研究在超低 稀释或作为时间、温度或 否则不可行或不可能的浓度 利用现有的放射源和探测器 这个建议的具体目标是发展一个小的，4-10 元件前端子组件，包括 电子和安装包，满足性能 以上所述的标准，可以联系在一起，形成 更大规模的数组。 要安装的子组件 开发和组装的产品包括碘化汞复合物， 探测器元件，混合多通道探测器，以及 安装和稍微冷却两个探测器的组装包 片和前端FET。 一个主要的测试工作将是 实施以确保克服预期问题， 分辨率限制噪声和通道间串扰。 最后，一项计划工作将检查电子设备， 计算机和集成所需的软件要求 将这些组件模块组装成成品，功能齐全， 易于操作的数组。

The long term objective is to develop the capability to build large arrays of energy dispersive x-ray detectors for installation and use at Synchrotron Radiation (SR) and other x-ray research facilities. Each array element would have energy resolution of 300 eV or better at 6 KeV and a count rate capability exceeding 50,000 cps. Completed arrays, containing upwards or 100 elements, could count at rates over 5x10-6 cps and are targeted to cost less than $l00,000. Coupled to the next generation of high brightness SR x-ray sources, these arrays would lead to a greatly enhanced ability to obtain the direct structural information which has been found to be so useful in unravelling the mechanisms by which proteins and enzymes function at the molecular level. The arrays could be organized either linearly, as diffraction detectors, or 2-dimensionally as fluorescence detectors for XANES and EXAFS. The projected increases in countrate capability and solid angle collection efficiency would make research possible at ultra-low dilutions or as a function of time, temperature, or concentration which would otherwise be unfeasible or impossible with currently available sources and detectors. This proposal's specific goal is to develop a small, 4-10 element front end subassembly, including preamplifier electronics and mounting package, which meets the performance criteria stated above and which can linked together to form larger scale arrays. The subassembly components to be developed and assembled include a Mercuric Iodide multiple detector element, a hybridized multichannel preamplifier, and an assembly package to mount and slightly cool both detector slice and front end FETs. A major testing effort will be implemented to assure overcome expected problems with resolution limiting noise and crosstalk between channels. Finally, a planning effort will examine the electronics, computer, and software requirements necessary to integrate these subassembly modules into finished, fully functioning, easy to operate arrays.