Development of Instrumentation for Imaging Scattered Cold Neutrons

目前正在研究材料的长程结构 使用慢（“冷”）中子和X-射线的小角散射， 射线 用衍射方法研究了局域有序。 的到来 更强的冷中子源，以及目前的情况， X射线源，需要更高的响应速度 在大面积阵列中。 目前的离子室线阵列是 限制为大约40，000 cts/s TOTAL，具有10%的死区时间。 比 每像素10，000 cts/s，几乎没有串扰，将“相当于 冷中子物理学的革命”。 弯曲探测器 对于拉伸的线不切实际。 使用半导体分- 阵列，5平方厘米，5平方毫米的元素，将允许 基本上球形阵列系统。 本项目将 开发包括转换器层的快速、高效的子阵列 配备100个探测器、100个放大器链和100个定标器/读出器 寄存器位于几片硅片上。 本 研究将测试系统的探测器部分， 整个系统的可行性。

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.