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Trigger design for a gamma ray detector of HIRFL-ETF

Chinese Physics C 2013年第10期37卷 49-55页

作者：杜中伟苏弘千奕孔洁 State Key Laboratory of Particle Detection & Electronics University of Science and Technology of China Institute of Modern Physics Chinese Academy of Sciences

The gamma ray Array detector （GRAD） is one subsystem of HIRFL-ETF （the External Target Facility （ETF） of the Heavy Ion Research Facility in Lanzhou （HIRFL））. It is capable of measuring the energy of gamma-rays with 1024 CsI scintillators in in-beam nuclear experiments. The GRAD trigger should select the valid events and reject the data from the scintillators which are not hit by the gamma-ray. The GRAD trigger has been developed based on the Field Programmable Gate Array （FPGAs） and PXI interface. It makes prompt trigger decisions to select valid events by processing the hit signals from the 1024 CsI scintillators. According to the physical requirements, the GRAD trigger module supplies 12-bit trigger information for the global trigger system of ETF and supplies a trigger signal for data acquisition （DAQ） system of GRAD. In addition, the GRAD trigger generates trigger data that are packed and transmitted to the host computer via PXI bus to be saved for off-line analysis. The trigger processing is implemented in the front-end electronics of GRAD and one FPGA of the GRAD trigger module. The logic of PXI transmission and reconfiguration is implemented in another FPGA of the GRAD trigger module. During the gamma-ray experiments, the GRAD trigger performs reliably and efficiently. The function of GRAD trigger is capable of satisfying the physical requirements.

关键词： gamma-ray detector trigger system field programmable gate array (FPGA)

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Comparison of two position sensitive gamma-ray detectors based on continuous YAP and pixellated NaI(TI) for nuclear medical imaging applications

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Chinese Physics C 2008年第11期32卷 934-938页

作者：祝杰马红光马文彦曾晖汪兆民许咨宗 The Second Artillery Engineering Institute Department of Modern Physics University of Science and Technology of China

Dedicated position sensitive gamma-ray detectors based on position sensitive photomultiplier tubes （PSPMTs） coupled to scintillation crystals, have been used for the construction of compact gamma-ray imaging systems, suitable for nuclear medical imaging applications such as small animal imaging and single organ imaging and scintimammography. In this work, the performance of two gamma-ray detectors： a continuous YAP scintillation crystal coupled to a Harnamastu R2486 PSPMT and a pixellated NaI（TI） scintillation array crystal coupled to the same PSPMT, is compared. The results show that the gamma-ray detector based on a pixellated NaI（TI） scintillation array crystal is a promising candidate for nuclear medical imaging applications, since their performance in terms of position linearity, spatial resolution and effective field of view （FOV） is superior than that of the gamma-ray detector based on a continuous YAP scintillation crystal. However, a better photodetector （Hamamatau H8500 Flat Panel PMT, for example） coupled to the continuous crystal is also likely a good selection for nuclear medicine imaging applications.

关键词： gamma-ray detector PSPMT continuous YAP scintillation crystal NaI(TI) scintillation array crystal

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The design and performance of GRD onboard the GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 43-52页

作者： Z.H.An X.L.Sun D.L.Zhang S.Yang X.Q.Li X.Y.Wen K.Gong X.H.Liang X.J.Liu Y.Q.Liu Y.G.Li S.L.Xiong Y.B.Xu Fan Zhang X.Y.Zhao C.Cai Z.Chang G.Chen C.Chen Y.Y.Du P.Y.Feng M.Gao R.Gao D.Y.Guo J.J.He D.J.Hou C.Y.Li G.Li L.Li X.F.Li M.S.Li F.J.Lu H.Lu B.Meng W.X.Peng F.Shi H.Wang J.Z.Wang Y.S.Wang H.Z.Wang X.Wen S.Xiao Y.P.Xu J.W.Yang Q.B.Yi S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang Y.Zhao X.Zhou CAS Institute of High Energy PhysicsBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China 3 Xiangtan UniversityXiangtan 411105China 4 Beijing Normal UniversityBeijing 110875China Xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China

Background Each GECAM satellite payload contains 25 gamma-ray detectors(GRDs),which can detect gamma-rays and particles and can roughly localize the gamma-ray Bursts(GRBs).GRD was designed using lanthanum bromide(LaBr3)crystal as the sensitive material with the rear end coupled with silicon photomultiplier(SiPM)array for *** In aerospace engineering design of GRD,there are many key points to be *** this paper,we present the specific design scheme of GRD,the assembly and the performance test results of *** Based on Monte Carlo simulation and experimental test results,the specific schematic design and assembling process of GRD were *** being fully assembled,the GRDs were conducted performance tests by using radioactive source and also conducted random vibration *** and conclusion The test results show that all satellite-borne GRDs have energy resolution<16%at 59.5 keV,meeting requirements of satellite in scientific *** random vibration test shows that GRD can maintain in a stable performance,which meets the requirement of spatial application.

关键词： Lanthanum bromide scintillator SiPM array GECAM gamma-ray detector Energy resolution

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