基于同步高速多通道数据采集的4πβ（LS）-γ（HPGe）数字符合系统
4πβ (LS)-γ (HPGe) Digital Coincidence System Based on Synchronous High-Speed Multichannel Data Acquisition
摘要：
研制了一套4πβ（LS）-γ（HPGe）数字符合系统。三个模数转换器（ADC）采集通道，采集分辨率为8位，采集速率为1GSPS（采样/秒）采集三个光电倍增管（PMT）的信号，采用两个采集通道，采集分辨率为16位，采集速率为50 MSPS，采集高纯锗中的信号，HPGe）探测γ衰变。为了提高符合系统的精度，所有五个采集通道在500 ps内同步。五个采集通道采集的数据通过PCI总线传输到上位机并保存为文件。4πβ（LS）-γ（HPGe）符合和数据分析采用离线软件进行。在上述前提条件下，增加了系统的灵活性，简化了系统的结构和应用。根据测试，系统的最高符合率为每秒20 K，这足以满足大多数应用。本文主要介绍了该系统的硬件设计、同步方法和测试结果。
英文摘要：
A dedicated 4πβ (LS)-γ (HPGe)digital coincidence system has been developed in this work, which includes five acquisition channels. Three analog-to-digital converter (ADC) acquisition channels with an acquisition resolution of 8 bits and acquisition rate of 1GSPS (sample per second) are utilized to collect the signals from three Photo multiplier tubes (PMTs) which are adopted to detect β decay, and two acquisition channels with an acquisition resolution of 16 bits and acquisition rate of 50MSPS are utilized to collect the signals from high-purity germanium (HPGe) which are adopted to detect γ decay. In order to increase the accuracy of the coincidence system, all the five acquisition channels are synchronous within 500ps. The data collected by the five acquisition channels will be transmitted to the host PC through PCI bus and saved as a file. Off-line software is applied for the 4πβ (LS)-γ (HPGe) coincidence and data analysis as needed in practical application. With all the above preconditions, the flexibility of the system is increased, and the structure and application of the system are simplified. According to the test, the highest coincidence rate of the system is 20K per second, which is sufficient for most applications. This paper mainly introduces the design of the hardware, the synchronization method and the test result of this system.
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