1-D Silicon Detector for Synchrotron XRD

描述(申请人提供)：我们将开发一种新的一维(L-D)硅条探测器，以及与之配套的集成电路脉冲处理电子设备，用于高速同步加速器粉末衍射实验。同步加速器一维衍射技术是阐明包括生物材料和药物在内的许多材料的晶体结构的有力工具。这种新的探测器将取代目前使用的点探测器(半导体和闪烁体/光电倍增管探测器)，并将在数据收集速度方面至少提高1-2个数量级。新的探测器具有约0.1 mm的空间分辨率，可以一次采集大部分衍射图，而不是像目前那样逐点采集，并将为区分衍射光和荧光光峰提供良好的能量分辨率。数据采集速度的提高不仅将增加样品吞吐量，利用新的第三代同步加速器光束线中光子通量的增加，而且还将开辟时间域实验的新领域。 在第一阶段，我们将评估一种原型硅条探测器，它与布鲁克海文国家实验室(BNL)最近开发的一种新的低噪声放大器ASIC(专用集成电路)相耦合，用于一维衍射应用。电子噪声、能量分辨率和高计数率性能将通过5-25键范围内的放射性同位素源和产生8keV X射线的高计数X射线发生器进行评估。在第二阶段，ASIC将与BNL的工作人员合作，针对这种衍射应用进行优化。整个探测器模块将由2x2平方厘米的多通道条形探测器阵列组成，与多通道ASIC进行线焊，并将包括ASIC的读出控制和数据采集软件。几个探测器模块将平铺在一起，形成一个完整的线性阵列，在2-theta衍射空间中覆盖~40度角。探测器原型将在国家同步加速器光源(在BNL)和斯坦福同步辐射实验室的衍射应用中进行评估。

DESCRIPTION (provided by applicant): We will develop a new one-dimensional (l-D) silicon strip detector, and the accompanying integrated circuit pulse-processing electronics, for high-speed synchrotron powder diffraction experiments. Synchrotron 1-D diffraction techniques are powerful tools in elucidating the crystalline structure of many materials, including biomaterials and pharmaceuticals. This new detector will replace the currently used point detectors (semiconductor and scintillator/PMT detectors) and will provide at least 1-2 orders of magnitude improvement in data collection speed. The new detector, with ~ 0.1 mm spatial resolution, will be able to collect a large portion of the diffraction pattern at one time instead of point-by-point as is currently done, and will provide good energy resolution for discrimination of the diffracted and fluoresced photopeaks. The increase in data collection speed will not only increase sample throughput and take advantage of the increase in photon flux in the new third generation synchrotron beamlines, but will also open up new realms of experiments in the time domain. In Phase I, we will evaluate a prototype silicon strip detector, coupled to a new low-noise amplifier ASIC (application specific integrate circuit) recently developed by Brookhaven National Laboratory (BNL), for the 1- D diffraction applications. The electronic noise, energy resolution, and high count rate performance will be evaluated with radioisotope sources in the 5- 25 keY range, and with a high count x-ray generator producing 8 keV x-rays. In Phase II, the ASIC will be modified for optimization for this diffraction application in collaboration with BNL staff. Full detector modules will be designed and constructed consisting of 2x2 cm2 multi-channel strip detector arrays, wire-bonded to the multi-channel ASICs, and will include readout control of ASICs and data acquisition software. Several detector modules will be tiled together to form a complete linear array covering a ~40 degree angle in the 2-theta diffraction space. The detector prototype will be evaluated in diffraction applications at the National Synchrotron Light Source (at BNL) and the Stanford Synchrotron Radiation Laboratory.