基于波形采样的PPAC数据处理  

Data Analysis of PPAC Based on Waveform Sampling

作　　者：马朋[1,2] 马军兵 魏向伦[1,2] 杨贺润 王建松 杨彦云[1] 张俊伟[1] 鲁辰桂[1] 段利敏 胡荣江[1] 关远帆[1,2] 胡强[1] 白真 MA Peng;MA Junbing;WEI Xianglun;YANG Herun;WANG Jiansong;YANG Yanyun;ZHANG Junwei;LU Chengui;DUAN Limin;HU Rongjiang;GUAN Yuanfan;HU Qiang;BAI Zhen(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,甘肃兰州730000 [2]中国科学院大学核科学与技术学院,北京100049

出　　处：《原子能科学技术》2019年第11期2282-2288,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11875302,11875301,11575268,11605253,11705242,11205221)

摘　　要：数字化波形采样技术在实验核物理中得到了广泛的应用,选取合适的采样频率非常重要。本文使用脉冲幅度甄别定时方法和恒比定时方法对采样频率为100MHz^5GHz的平行板雪崩计数器(PPAC)信号进行了模拟分析,采样频率为250~500MHz时,使用脉冲幅度甄别定时方法可得到比较精确的位置信息,与传统获取系统定位的位置分辨的差别Sigma小于0.15mm,采样频率低于100MHz时信号定位误差较大。使用高速采样数字化仪可对信号幅度小于20mV的信号进行定时分析,与传统的PPAC获取系统相比,探测效率提升了4.3%。The digital waveform sampling technology is widely used in nuclear physics experiment.It is very important to choose an appropriate sampling frequency.The pulse amplitude discrimination timing method and the constant fraction discrimination timing method were utilized to simulate and analyze the parallel-plate avalanche counter(PPAC)signal with the sampling frequency from 100 MHz to 5 GHz.As the sampling frequency reaches 250-500 MHz,a more accurate position information can be obtained by using the pulse amplitude discrimination timing method.The position distribution Sigma between the pulse amplitude discrimination timing method and the traditional acquisition system is less than 0.15 mm.The position distribution error becomes larger as the sampling frequency is lower than 100 MHz.The high-speed sampling digitizer can be utilized to analyze small signals with signal amplitude less than 20 mV,and the detection efficiency is 4.3%higher than that of traditional PPAC acquisition system.

关 键 词：高速采样数字化仪 平行板雪崩计数器 脉冲幅度甄别定时 

分 类 号：TL811[核科学技术—核技术及应用]