We have studied the performance of two different types of front-end systems for our gamma camera based on Hamamatsu H8500 (flat-panel 64 channels multi-anode PSPMT) with a CsI(Tl) scintillator array. The array consists of 64 pixels of $6\times6\times20{\rm mm}^3$ which corresponds to the anode pixels of H8500. One of the system is based on commercial ASIC chips in order to readout every anode. The others are based on resistive charge divider network between anodes to reduce readout channels. In both systems, each pixel (6mm) was clearly resolved by flood field irradiation of $^{137}$Cs. We also investigated the energy resolution of these systems and showed the performance of the cascade connection of resistive network between some PMTs for large area detectors.
First experimental proof of PET imaging based on multi-anode MCP-PMTs with Cherenkov radiator-integrated window
Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);University of Chinese Academy of Sciences(中国科学院大学);Jinan Laboratory of Applied Nuclear Science(济南应用核科学实验室);CAEA Centre of Excellence on Nuclear Technology Applications for Nuclear Detection and Imaging(中国原子能工业核技术应用卓越中心);North Night Vision Science & Technology (Nanjing) Research Institute Co. Ltd(北方夜视科技(南京)研究院有限公司)
Machine-Learning based photon counting for PMT waveforms and its application to the improvement of the energy resolution in large liquid scintillator detectors
Localised response retrieval from Hamamatsu H9500 for a coded aperture neutron-gamma imaging system based on an organic pixelated plastic scintillator (EJ-299-34)
Multiple-photon disambiguation on stripline-anode Micro-Channel Plates
大面积皮秒光电探测器(LAPPD)显示出将微通道板(MCP)的性能范围扩展到20 x 20 cm或更大面积的巨大潜力。这种缩放引入了新的挑战,包括如何满足越来越大面积MCP的电子读出负担。一种解决方案是用微波带状线阳极代替用于读出的传统栅格阳极,从而允许通道计数与MCP宽度而不是面积成比例。然而,带状线阳极引入了栅格阳极中不常处理的新问题,特别是当它们的长度增加时。其中一个问题是多个光子几乎同时到达探测器,这可能会造成关于如何重建它们的到达时间和位置的混乱。我们提出了一个最大的后验解决方案的问题,并验证其性能在模拟闪烁体和水切伦科夫探测器。
Common Iron Passive Magnetic Shielding for Scintillator Array Photomultiplier Tubes
Joint Institute for Nuclear Research(俄罗斯核联合研究所);Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan(哈萨克斯坦共和国能源部核物理研究所);Lomonosov Moscow State University(莫斯科罗蒙诺索夫国立大学);Massachusetts Institute of Technology(麻省理工学院);Tel-Aviv University(特拉维夫大学);Tsinghua University(清华大学)
Application of large area SiPMs for the readout of a plastic scintillator based timing detector
在这项研究中,八个6 mm x 6 mm面积的SiPM阵列耦合到长塑料闪烁体计数器的末端,该计数器在CERN PS暴露于2.5 GeV/c μ子束。研究了尺寸为150 cm x 6 cm x 1 cm和120 cm x 11 cm x 2.5 cm的棒的定时特性。基于新型低输入阻抗电流传输器的8通道SiPM阳极读出ASIC(MUSIC R1)被用来独立地读出和放大SiPM,并在最后对信号求和。根据这些结果,展望了在时间分辨率低于100 ps的大尺度粒子物理探测器中的应用前景。
Response of a Li-glass/multi-anode photomultiplier detector to $α$-particles from $^{241}$Am
测量了位置敏感锂玻璃闪烁体探测器对来自准直$^{241}$ Am源的$α$粒子的响应。闪烁光由8 X 8像素多阳极光电倍增管读出,并且对于扫描上的每个位置记录每个像素的信号幅度。像素信号强烈地依赖于位置,并且通常几个像素将记录高于给定阈值的信号(命中)。研究了该阈值对命中多重性的影响,以优化检测器的单次命中效率。
Pixelated Plastic Scintillator Array Manufacturing using Fast-, Photo-Curable Resin
Air Force Institute of Technology(空军理工学院);Oak Ridge National Laboratory(橡树岭国家实验室);Defense Threat Reduction Agency Nuclear Science and Engineering Research Center(国防威胁降低局核科学与工程研究中心)
Prototype of Readout Electronics for the ED in LHAASO KM2A
KM 2A(一平方公里的广泛空气簇射阵列)是LHAA- SO(大型高海拔空气簇射观测站)项目中最大的探测器阵列。KM 2A由5635个ED(电磁粒子探测器)和1221个MD(μ子探测器)组成。ED在野外分布和暴露。光电倍增管(光电倍增管)信号的读出采用阳极和倍增管两个通道。本文提出的读出电子学的目标是精确测量光电倍增管信号的电荷和到达时间,该信号覆盖从20 P. E(光电子)到2 × 10^5 P. E的大幅度范围。通过使用无触发架构,我们将信号传输到PMT附近。所有数字化数据通过简化的WR(白兔)协议传输到DAQ(数据采集)。与传统的高能实验相比,大面积时间测量的高精度和野外温度效应的抑制成为关键技术。实验表明,该设计达到了项目要求。