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许多材料的晶体结构的有力工具，包括生物材料和药物。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/PMT探测器），并将在数据收集速度上提供至少1-2个数量级的改进。新探测器的空间分辨率约为0.1 mm，将能够一次收集大部分衍射图案，而不是像目前那样逐点收集，并且将为衍射和荧光光峰的区分提供良好的能量分辨率。数据采集速度的提高不仅可以提高样品通量，利用第三代同步加速器光束线中光子通量的增加，而且还将在时域上开辟新的实验领域。

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.