60 μ m间距CdTe双面条探测器的成像和光谱性能
Imaging and Spectral Performance of a 60 μm Pitch CdTe Double-Sided Strip Detector
摘要：
我们已经评估了一个细间距碲化镉双面条探测器（CdTe DSD），这是最初开发的硬X射线望远镜的焦平面探测器，以观察太阳的性能。探测器具有750 μ m的厚度，并且具有128个带电极，带电极具有60 μ m的带间距，垂直地放置在探测器的两侧上，并且覆盖4keV至80keV的能量范围。光子相互作用的深度和电荷共享效应的研究是重要的，以提供良好的光谱和成像性能。我们研究了由电荷捕获引起的光谱中观察到的尾部结构，并开发了一种新的方法来重建的基础上从阳极和阴极条的诱导电荷信息的光谱。通过应用这种方法，能量分辨率（FWHM）为0.76 keV和1.0 keV的光子能量为14 keV和60 keV，分别可以得到，如果阳极和阴极之间的能量差是在1 keV。此外，在60 keV处的尾部分量被减少，并且如果能量差大于1 keV，则60 keV峰的能量分辨率从2.4 keV提高到1.5 keV（FWHM）。为了研究成像性能，我们构建了一个简单的成像系统，使用5 mm厚的钨板，其具有直径为100 μ m的针孔。我们利用直径为1 mm的Ba-133放射性同位素作为靶源，并结合由0.5 mm厚的钨制成的100 um狭缝。我们使用30 keV峰值对100 um狭缝后面的Ba-133源进行成像，其中100 um针孔放置在源-检测器距离的中心处。通过在条带之间应用电荷共享校正，我们成功地获得了优于60 μ m条带间距的位置分辨率。
英文摘要：
We have evaluated the performance of a fine pitch CdTe Double-sided Strip Detector (CdTe-DSD), which was originally developed for the focal plane detector of a hard X-ray telescope to observe the Sun. The detector has a thickness of 750 um and has 128 strip electrodes with a 60 um strip pitch orthogonally placed on both sides of the detector and covers an energy range 4 keV to 80 keV. The study of the depth of photon interaction and charge sharing effects are of importance in order to provide good spectroscopic and imaging performance. We study the tail structure observed in the spectra caused by charge trapping and develop a new method to reconstruct the spectra based on induced charge information from both anode and cathode strips. By applying this method, energy resolutions (FWHM) of 0.76 keV and 1.0 keV can be obtained at photon energies of 14 keV and 60 keV, respectively, if the energy difference between the anode and cathode is within 1 keV. Furthermore, the tail component at 60 keV is reduced, and the energy resolution of the 60 keV peak is improved from 2.4 keV to 1.5 keV (FWHM) if the energy difference is greater than 1 keV. In order to study the imaging performance, we constructed a simple imaging system using a 5 mm thick tungsten plate that has a pinhole with a diameter of 100 um. We utilize a Ba-133 radioisotope of 1 mm in diameter as a target source in combination with a 100 um slit made from 0.5 mm thickness tungsten. We imaged the Ba-133 source behind the 100 um slit using a 30 keV peak, with a 100 um pinhole placed at the center of the source-detector distance. By applying a charge sharing correction between strips, we have succeeded in obtaining a position resolution better than the strip pitch of 60 um.
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