15 August 2011 Temporal resolution of x-ray detector for pulsar navigation
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Abstract
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 CsI 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 CsI 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 (ΔT) of the entire detection system could be determined by ▵tD, the intrinsic temporal resolution of cathode-MCP-anode, and ▵E the resolution of electronic system including preamplifier and CFD. The resolution of the detection system is tested to be 18.4ns in experiment.
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Li-zhi Sheng, Li-zhi Sheng, Bao-sheng Zhao, Bao-sheng Zhao, Hui-jun Hu, Hui-jun Hu, Peng Wang, Peng Wang, Qiu-rong Yan, Qiu-rong Yan, Bao-mei Chen, Bao-mei Chen, Yong-an Liu, Yong-an Liu, Xiao-ping OuYang, Xiao-ping OuYang, Ding Chen, Ding Chen, } "Temporal resolution of x-ray detector for pulsar navigation", Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 81961C (15 August 2011); doi: 10.1117/12.900678; https://doi.org/10.1117/12.900678
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