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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Temporal Resolution of X-ray Detector for Pulsar Navigation
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Temporal Resolution of X-ray Detector for Pulsar Navigation

机译：用于脉冲星导航的X射线探测器的时间分辨率

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摘要

Pulsar navigation is a promising new technique for space exploration because of its autonomous and deep space capability. Since the baseline of pulsar navigation approach is to observe the X rays (0.2～20keV) emitted from pulsars, a compact high temporal resolution X-ray detector is needed. In this paper an micro-channel plate(MCP) photon counting detector sensitive to X-rays is proposed. The detection system consists of a Csl photocathode, a 50mm diameter micro-channel plate (MCP) stack, a collection anode, a preamplifier, a constant fraction discriminator(CFD) and data acquisition(DAQ). The incident X-rays photons are absorbed by Csl and converted to photoelectrons, the electrons are multiplied by MCP and collected by the anode. Anode output signal is a fast pulse which need to be amplified by preamplifier and then fed to CFD circuit and DAQ for a precise timing. The total temporal resolution(△T) of the entire detection system could be determined by △t_D, the intrinsic temporal resolution of cathode-MCP-anode, and △t_E the resolution of electronic system including preamplifier and CFD. The resolution of the detection system is tested to be 18.4ns in experiment.
机译：脉冲星导航由于具有自主性和深空能力，是一种有前途的空间探索新技术。由于脉冲星导航方法的基线是观察脉冲星发出的X射线（0.2〜20keV），因此需要一个紧凑的高时间分辨率X射线探测器。提出了一种对X射线敏感的微通道板光子计数检测器。该检测系统由一个Csl光电阴极，一个直径为50mm的微通道板（MCP）堆栈，一个收集阳极，一个前置放大器，一个恒定分数鉴别器（CFD）和数据采集（DAQ）组成。入射的X射线光子被Csl吸收并转换为光电子，电子被MCP倍增并被阳极收集。阳极输出信号是一个快速脉冲，需要通过前置放大器进行放大，然后再馈入CFD电路和DAQ以进行精确定时。整个检测系统的总时间分辨率（△T）可以由△t_D，阴极-MCP阳极的固有时间分辨率以及△t_E包括前置放大器和CFD的电子系统的分辨率确定。实验中检测到的系统分辨率为18.4ns。

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