DETECTOR ARRAYS FOR SYNCHROTRON RADIATION RESEARCH

长期目标是发展建造 大型能量色散X射线探测器阵列，用于 同步辐射加速器(SR)和其他设备的安装和使用 X射线研究设施。每个数组元素将具有 在6keV和计数速率下，能量分辨率为300 eV或更高 容量超过50,000 cps。已完成的数组，包含 超过或100个元素，计数速度可超过5x10-6cps 目标是成本低于10万美元。耦合到 下一代高亮度SR X射线源，这些 数组将大大增强获取 已被发现是这样的直接结构信息 有助于解开蛋白质和蛋白质 酶在分子水平上发挥作用。这些数组可能是 线性组织的，如衍射探测器，或 作为XANES和EXAFS的二维荧光检测器。 国家能力和立体角的预计增长 收集效率将使超低温度下的研究成为可能 稀释度或作为时间、温度或 原本不可行或不可能的集中精力 以及目前可用的源和探测器。 这项提议的具体目标是开发一种小型的，4-10 元件前端组件，包括前置放大器 电子和安装组件，满足性能要求 上述标准，并可链接在一起以形成 更大规模的阵列。要安装的部件零部件 开发和组装包括一种多碘汞化合物 检测器元件，混合多声道前置放大器，以及 用于安装和稍微冷却两个探测器的组件包 切片和前端FET。一项主要的测试工作将是 实施以确保克服预期的问题 分辨率限制了通道之间的噪声和串扰。 最后，计划工作将检查电子设备， 计算机，以及集成所需的软件要求 将这些组件组装成成品，功能齐全， 易于操作的阵列。

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.