Timing in thick silicon detectors - an update.
Timing in thick silicon detectors - an update.
复制标题
厚硅探测器的计时——更新。
DOI：
10.1016/j.nima.2007.04.060
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Kramberger,G
中科院分区：
文献类型：
--
作者：
Studen,A;Clinthorne,N;Mikuž,M;Kramberger,G
由于有可靠的探测器，厚硅探测器的应用越来越广泛。它们通常被认为是巧合设置的一部分，其中时间分辨率是至关重要的。由于厚探测器的过偏有时是不切实际的，因此厚探测器的时间分辨率会受到损害。本文计算了1.4 × 1.4mm2衬垫尺寸和1mm厚衬垫探测器的电场和雷默场。利用GEANT4测定了光子相互作用中产生的相互作用电子的轨迹，并模拟了电离载流子在探测器中的漂移。信号处理采用虚拟前置放大器、整形时间为200ns的CR-RC整形器和前缘鉴别器。事件后触发器的延迟分布与测量结果进行了比较，发现了很好的一致性，允许在实验设置中附加噪声。我们提出并评估了一种从最近的九个发射台读取信号的替代读出策略，该策略大大降低了非均匀拉莫场对时序分辨率的影响。
Thick silicon detectors are becoming widely used with reliable detectors available. They are often considered as a part of coincidence setup, where the timing resolution is of a crucial importance. Since over-biasing of thick detectors is sometimes unpractical, the timing resolution can be compromised in thick detectors. For this article the electric and Ramo fields in a 1.4 by 1.4mm2pad size and 1mm thick pad detector were calculated. GEANT4 was used to determine the tracks of the interaction electron produced in photon interactions, and the drift of ionized carriers in the detector was simulated. The signals were processed using a virtual preamplifier, a CR-RC shaper with a shaping time of 200ns and a leading edge discriminator. The distributions of delay of the trigger after the event were compared to the measurements and a good agreement was found, allowing for additional noise in experimental setup. We proposed and evaluated an alternative readout strategy reading signals from nine nearest pads which greatly reduces the effects of inhomogeneous Ramo field on the timing resolution.