MERCURIC IODIDE ARRAYS FOR SYNCHROTRON RADIATION

用于同步辐射的碘化汞阵列

• 批准号: 3292270
• 负责人: Jan S Iwanczyk
• 金额: $ 61.06万
• 依托单位: ADVANCED DETECTORS, INC.
• 依托单位国家: 美国
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3292270
• 关键词: X ray crystallography; computer data analysis; computer program /software; electronic spectra; iodine; mercury; monitoring device; particle accelerators; radiation detector

The long term objective of this research 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 of 100 elements, could count at effective rates over 5x10'6 cps and are targeted to cost about $1000/elements. 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, bonding and compositional 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,EXAFS or scanning fluorescence microscopy. 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. HgI2 was chosen because its room temperature operation and ease of passivation vastly simplify detector design and construction. The previous proposal showed that HgI2 can be arrayed by developing a 5 element detector+FET submodule package designed to be closely packed to create an array detector system front end. This proposal's specific goal is to complete working energy dispersive array detector systems of 20, 100 and 400 elements. The major intermediate development include: techniques to produce the submodules without degrading their performance,a submodules mounting technique to assure thermal contact and rigidity with electronic isolation; advanced miniaturized processing electronics to support the front end; and system hardware and software integration. The use of existing commercial electronics for the 400 element detector, for example, would cost over $1.2M and fill 5 racks with a tangle of equipment too complex for effective use. The proposed electronics modules would reduce costs by a factor of over 5, volume by 10, power consumption by 5, and would integrate amplifier, pileup rejection and single channel analysis functions into a single, computer controlled CAMAC package. All system functions, including calibration, energy tuning, data collection and fault detection will then by automated by creation of appropriate control software. The proposed advanced in electronic function will be accomplished by taking existing designs, simplifying, specializing and optimizing them for this specific application, and then miniaturizing them by the hybridization process. The completed detector systems will be deployed at national synchrotron laboratories in support of existing NIH biotechnology research programs.

这项研究的长期目标是发展能力， 建造大型能量色散X射线探测器阵列， 并用于同步辐射（SR）和其他X射线研究 设施每个阵列元件将具有300 eV或更高的能量分辨率。 在6 KeV和超过50，000 cps的计数率能力下更好。 包含100个以上元素的完整数组可以计数为 有效速率超过5x 10 '6 cps，目标成本约为 1000美元/元素。再加上下一代高亮度SR x- 射线源，这些阵列将导致大大增强的能力， 获得直接的结构、键合和组成信息， 已经被发现是如此的有用，在解开机制， 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，或二维组织 作为XANES、EXAFS或扫描荧光的荧光检测器 显微镜预计将增加的计数能力和固体 角收集效率将使研究在超低 稀释度或作为时间、温度或浓度的函数， 否则是不可行或不可能的。选择HgI 2是因为 室温操作和易于钝化大大简化了 探测器设计和构造。 以前的建议表明，HgI 2可以通过开发一个5 元件探测器+FET子模块封装，设计紧凑， 创建阵列探测器系统前端。该提案的具体目标 是完成20个能量色散阵列探测器系统的工作， 100和400个元素。主要的中间发展包括： 技术，以生产子模块，而不会降低其 性能，子模块安装技术，以确保热接触， 电子隔离的刚性;先进的小型化处理 支持前端的电子设备;以及系统硬件和软件 一体化使用现有的商业电子产品为400 例如，一个元素探测器将花费超过120万美元，并填满5个机架 一堆复杂的设备无法有效使用拟议 电子模块将使成本降低5倍以上， 10、功耗降低5倍，并将功放集成，叠加 抑制和单通道分析功能集成到一台计算机中 控制CAMAC包。所有系统功能，包括校准， 能量调整、数据收集和故障检测将自动化， 通过创建适当的控制软件。该提议在 电子功能将通过采用现有的设计来实现， 简化、专门化和优化它们， 应用，然后通过杂交过程将它们杂交。 完成的探测器系统将部署在国家同步加速器 支持现有NIH生物技术研究计划的实验室。