X-ray tests of a Pixel Array Detector for coherent x-ray imaging at the Linac Coherent Light Source
X-ray tests of a Pixel Array Detector for coherent x-ray imaging at the Linac Coherent Light Source
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DOI：
10.1088/1748-0221/4/03/p03001
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发表时间：
2009-03-01
影响因子：
1.3
通讯作者：
Gruner, S. M.
中科院分区：
文献类型：
--
作者：
Koerner, L. J.;Philipp, H. T.;Gruner, S. M.
展示了在斯坦福线性相干光源 (LCLS) 上为 X 射线成像而开发的像素阵列探测器 (PAD) 的测试结果。 PAD 的基本模块由两个凸块接合芯片组成：一个 185 x 194 像素的反向偏置硅二极管芯片，每个芯片都通过凸块接合耦合到每个像素中具有数字化功能的电荷集成 CMOS ASIC。 LCLS 实验需要高信噪比来检测单个 8 keV X 射线、超过 1,000 个 8 keV X 射线的像素全阱、120 Hz 的帧速率，以及处理每个像素在数十飞秒内到达的数千个 X 射线的能力。测量结果验证了 2,700 8 keV X 射线的像素全阱值。单 8 keV 光子检测的信噪比 > 6。线扩散响应测量证实电荷扩散仅限于最近的相邻像素。在探测器表面剂量高达 75 Mrad(Si) 后，模块仍能正常工作。将一系列模块整合到大面积探测器中的工作正在进行中。
Test results are presented of a pixel array detector (PAD) developed for x-ray imaging at the Stanford Linear Coherent Light Source (LCLS). The basic module of the PAD consists of two bump-bonded chips: a reverse-biased silicon diode chip of 185 x 194 pixels, each of which is coupled by bump-bonds to a charge integrating CMOS ASIC with digitization in each pixel. The LCLS experiment requires a high signal-to-noise ratio for detection of single 8 keV x-rays, a pixel full-well exceeding 1,000 8 keV x-rays, a frame-rate of 120 Hz, and the ability to handle the arrival of thousands of x-rays per pixel in tens of femtoseconds. Measurements have verified a pixel full-well value of 2,700 8 keV x-rays. Single 8 keV photon detection has been shown with a signal-to-noise ratio of > 6. Line-spread response measurements confirmed charge spreading to be limited to nearest neighbor pixels. Modules still functioned after dosages up to 75 Mrad(Si) at the detector face. Work is proceeding to incorporate an array of modules into a large-area detector.