束流剖面探测器多通道微电流数字化读出系统设计  

Design of a multi-channel micro-current digital readout system for beam profile monitor

作　　者：张惊蛰 刘美洋 赵兴荣 肖金凤 张博 王小睿 ZHANG Jingzhe;LIU Meiyang;ZHAO Xingrong;XIAO Jinfeng;ZHANG Bo;WANG Xiaorui(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzh ou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《电子科技大学学报》2025年第2期174-183,共10页Journal of University of Electronic Science and Technology of China

摘　　要：针对兰州重离子治癌装置束流诊断系统中束流剖面探测器分条电离室,研制了一套多通道微电流数字化读出系统,包括数据采集电路和上位机软件。数据采集电路基于电流数字转换芯片ADAS1128设计,具有256路模拟输入通道,接收分条电离室探测器输出的微电流信号并将其转化为数字信号。采集数据通过FPGA处理后,由千兆以太网传输到上位机,上位机软件接收数据并进行存储、处理和显示。数据采集电路体积小,尺寸仅为14 cm×12 cm,便于和分条电离室探测器集成安装。通过测试,在43.5~691.25 nA工作范围内,通道噪声最大为3.8 nA,非线性误差小于0.3%,系统单通道最大功耗约为13 mW。系统经过长时间运行稳定可靠,满足分条电离室对数据采集系统高精度、高集成度和低功耗的需求。A multi-channel micro-current digital readout system,comprising a data acquisition circuit andhost computer software,was developed for the beam profile monitor in the beam diagnosis system of the LanzhouHeavy Ion Cancer Treatment Facility.The data acquisition circuit is based on the current digital conversion chipADAS1128,which has 256 analog input channels to receive the micro-current signals output from the split-stripionization chamber detector and convert them into digital signals.The collected data is processed by FPGA andtransmitted to the host computer by Gigabit Ethernet,and then received by the host computer software for storage,processing and display.The data acquisition circuit measures only 14 cm×12 cm,making it easy to integrate withthe split-strip ionization chamber detector.The test results indicate that within the operating range of 43.5 nA to691.25 nA,the maximum channel noise is 3.8 nA,the non-linear error is less than 0.3%,and the maximum powerconsumption of a single channel in the system is approximately 13 mW.The system has proven to be stable andreliable after an extended period of operation.It can meet the requirements for high precision,high integration,andlow power consumption in the data acquisition system of the split-strip ionization chamber detector.

关 键 词：重离子治癌 束流诊断 数据采集 电流数字转换 FPGA 

分 类 号：TL82[核科学技术—核技术及应用]