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首页> 外文会议>IEEE-NPSS Real Time Conference >Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination
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Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination

机译：实时读出电子系统的设计和开发，用于从方形多阳极光电倍增管中检索数据，用于中子伽马脉冲形状识别

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摘要

Pulse Shape Discrimination (PSD) algorithms can reliably separate neutrons and gamma-ray photons interacting in a scintillation detector. When implemented in the digital domain, the PSD algorithms allow real-time discrimination between neutron and gamma sources. This paper presents a design of a readout electronics system to retrieve data from a multi-anode photomultiplier tube (MAPMT) for a scintillator based coded-aperture neutron imager. The scintillator is to be coupled with Hamamatsu H9500, a square MAPMT, where each anode of the MAPMT is linked to a resistor network to infer the position of incidence of radiation within the scintillant. Additionally, the resistor network output signals are to be filtered through a novel noise reduction circuit to preserve the data corresponding to each pulse. Localised pulses are digitised using high sampling rate Analogue to Digital Converter (ADC). Sampled signals are temporarily stored in a local ping-pong buffer, before being processed on a field programmable gate array (FPGA). Initial results suggest that 150 MSPS rate provides sufficient information for neutron gamma source discrimination using PSD. Parallel real-time signal processing, implemented on the FPGA, enables multi-channel functioning to generate an array of interactions within the scintillator in terms of gamma rays and neutrons.
机译：脉冲形状判别（PSD）算法可以可靠地分离在闪烁探测器中相互作用的中子和伽马射线光子。当在数字域中实现时，PSD算法可以实时区分中子源和伽马源。本文提出了一种用于从基于闪烁器的编码孔径中子成像仪的多阳极光电倍增管（MAPMT）检索数据的读出电子系统的设计。闪烁体将与方形MAPMT的Hamamatsu H9500耦合，其中MAPMT的每个阳极都连接到电阻器网络，以推断闪烁体内辐射的入射位置。另外，电阻器网络的输出信号将通过新颖的降噪电路进行滤波，以保留与每个脉冲相对应的数据。使用高采样率的模数转换器（ADC）将本地化的脉冲数字化。在现场可编程门阵列（FPGA）上进行处理之前，已采样的信号会临时存储在本地的乒乓缓冲区中。初步结果表明，150 MSPS速率可为使用PSD的中子伽马射线源分辨提供足够的信息。在FPGA上实现的并行实时信号处理使多通道功能能够在闪烁体中生成伽玛射线和中子方面的相互作用阵列。

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