Synchrotron study of charge transport in a CZT ring-drift detector
Synchrotron study of charge transport in a CZT ring-drift detector
复制标题
CZT 环漂移探测器中电荷传输的同步加速器研究
DOI：
10.1016/j.nima.2011.05.009
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发表时间：
2011
影响因子：
1.4
通讯作者：
M. A. Webb
中科院分区：
文献类型：
--
作者：
R. Hartog;A. Owens;A. Kozorezov;J. Wigmore;V. Gostilo;M. A. Webb
We report on experimental and theoretical results obtained with a CdZnTe (CZT) detector with a versatile read-out scheme: the ring detector. This detector has been tested extensively both in our laboratories and at the HASYLAB synchrotron facility and has demonstrated excellent energy resolution of up to 0.73%, over a wide dynamic range covering 6−662keV. The key feature in this design is carefully managed charge transport, which eliminates the hole contribution, and optimizes the electron collection. We have developed a theoretical model of this detector, to enable the optimization of the read-out structure as a function of detector dimensions. A comparison between X-ray scans across the detector and model calculations shows that the model already captures all the major detector features, but still leaves a few challenging questions related to CZT surface conductivity. A defect in the detector, which breaks the expected cylindrical symmetry of the charge transport, is examined in detail by differential spectrometry, a powerful technique, which exploits differences in X-ray absorption between bulk and defect.
