Development of Instrumentation for Imaging Scattered Cold Neutrons

散射冷中子成像仪器的开发

• 批准号: 8760693
• 负责人: John Walter
• 金额: $ 4.95万
• 依托单位: IntraSpec Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-01 至 1988-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8760693&HistoricalAwards=false
• 关键词: Development; Instrumentation; Imaging; Scattered; Cold

The long range structure of materials is currently being studied using small angle scattering of slow ("cold") neutrons and X- rays. Local order is studied by diffraction. With the advent of stronger sources of cold neutrons, and the current situation with X-ray sources, there is a need for much higher speed of response in large area arrays. Present ion-chamber wire arrays are limited to about 40,000 cts/s TOTAL with 10% deadtime. Ratios of 10,000 cts/s PER PIXEL, with little crosstalk, would "amount to a revolution in cold-neutron physics". Curved detectors are impractical with stretched wires. The use of semiconductor sub- arrays, 5 cm square, with 5 mm square elements, would allow substantially spherical array systems. The present project will develop fast, efficient sub-arrays comprising a converter layer with 100 detectors, 100 amplifier chains and 100 scaler/readout registers located on a few slices of silicon. The present research will test the detector portion of the system and study the feasibility of the complete system.

材料的长程结构目前正在使用慢（“冷”）中子和X射线的小角度散射来研究。用衍射法研究了局部阶。随着更强的冷中子源的出现，以及x射线源的现状，需要在大面积阵列中有更高的响应速度。目前的离子室线阵列限制在40000 cts/s左右，死区时间为10%。每像素10000 cts/s的比率，加上很少的串扰，将“相当于冷中子物理学的一场革命”。弯曲的探测器用拉伸的电线是不实用的。使用半导体子阵列，5厘米见方，5毫米见方的元素，将允许基本上球形阵列系统。目前的项目将开发快速，高效的子阵列，包括一个转换器层，其中有100个检测器，100个放大器链和100个位于几片硅上的缩放/读出寄存器。本研究将对系统的探测器部分进行测试，并研究整个系统的可行性。