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Design of a high-sampling-rate electronic module for array-detector positron annihilation lifetime measurements

Radiation Detection Technology and Methods 2019年第3期3卷 127-135页

作者： Jiale Cai Daowu Li Yingjie Wang Zhiming Zhang Peilin Wang Haohui Tang Baoyi Wang Xingzhong Cao Fuyan Liu Long Wei Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Introduction In this study,a high-time-resolution electronic module with a high channel density and low power consumption was designed for the measurement of the multi-detector array positron annihilation *** electronic module consisted of 32 input channels,and each channel provided a high sampling rate up to 5.12 GSPS based on a Domino Ring Sampler 4(DRS4)*** to the high-speed flash analog-digital converter(FADC),DRS4 chip has a higher channel density with an affordable lower price and power *** The developed electronic module was also capable of real-time data analysis for directly extracting the time information of input signals at the data acquisition site,thereby significantly decreasing the data *** digital constant fraction discriminator(DCFD)algorithm was implemented in the field programmable gate array(FPGA)for performing the time *** The coincidence time resolution of the electronic module was measured,and the test results revealed a value of 26 ps.A prototypical 16-pixel detector module of the multi-detector system was evaluated using this electronic module,and the coincidence time resolution of the prototypical module was 411.84 *** The electronic module was confirmed to satisfy the severe requirements of the multi-array-detector positron annihilation lifetime measurement *** was also suitable for other high-time-resolution,high-channel-density,costeffective,and low-power-consumption applications.

关键词： digital constant fraction discriminator FPGA DRS4 Positron lifetime

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