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Study of the front-end signal for the 3-inch PMTs instrumentation in JUNO

Radiation Detection Technology and Methods 2022年第3期6卷 349-360页

作者： Diru Wu Jilei Xu Miao He Zhimin Wang Ziliang Chu Institute of High Energy Physics Beijing 100049China University of Chinese Academy of Sciences Beijing 100049China

A total of 25,6003-inch PMTs will be installed in Jiangmen Underground Neutrino Observatory(JUNO)to achieve more precise energy calibration and to extend the physics detection *** of all bare PMTs have been characterized and these PMTs are being instrumented with the high voltage divider,underwater front-end cable,and *** this paper,we present a dedicated study on signal quality at different stages of the *** optimized high voltage ratio was conﬁrmed andﬁnalized which improved the PMT transit time spread by 25%.The signal charge was attenuated by 22.5%(13.0%)in the 10 m(5 m)cable and it required the addition of 45 V(23 V)to compensate for the loss of PMT *** was a 1%overshoot following the PMT signal and no sign of reﬂection in the connector.A group of 163-inch PMTs with the full instrumentation was installed in the JUNO prototype detector together with a few 8-inch and 20-inch PMTs,which showed good stability and demonstrated a photon detection system with multiple types of PMTs.

关键词： JUNO 3-inch PMT PMT divider TTS signal attenuation JUNO prototype

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Sub-THz signals' propagation model in hypersonic plasma sheath under different atmospheric conditions

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Science China(Information Sciences) 2017年第11期60卷 242-252页

作者： Kai YUAN Yuhao WANG Linfang SHEN Ming YAO Xiaohua DENG Fuhui ZHOU Zhou CHEN Institute of Space Science and Technology Nanchang University Information Engineering School Nanchang University

One of the aims for modern hypersonic cruise flight is hypersonic global reach. The length of route for such flights could be up to thousands of kilometers. The atmospheric conditions on the route are complicated. On the other hand, hypersonic flights used to suffer from communication blackout. The sub-THz communication is considered as a potential solution to the ‘blackout’. In the present study the propagation for sub-THz signals in hypersonic plasma sheaths was modeled under different atmospheric conditions. According to the study, the electron density and the electron collision frequency near the onboard antenna linearly increase with the atmospheric mass density around the vehicle, hence the attenuation of sub-THz signals in hypersonic plasma sheaths increases with the atmospheric mass density. The impact led by the atmospheric temperature is ignorable. Based on the study a new sub-THz signals’ propagation model was developed, which could be utilized for quick estimation for signal propagation under different atmospheric conditions. The geographical difference of signal propagation over the whole globe was obtained with the new model. The results showed that the signal attenuation in plasma sheaths varies with latitude and longitude. The maximum signal attenuation occurs in Alaska, Canada and Russia.

关键词： sub-THz communication hypersonic cruise flight communication blackout plasma sheath signal propagation model signal attenuation

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Performance analysis for a two-way relaying power line network with analog network coding

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Frontiers of Information Technology & Electronic Engineering 2015年第10期16卷 892-898页

作者： Yu-wen QIAN Meng TIAN Xue JIANG Hua-ju SONG Feng SHU Jun LI School of Electronic and Optical Engineering Nanjing University of Science and Technology School of Biochemical and Environmental Engineering Nanjing Xiao Zhuang University

In this paper, we investigate a two-way relaying power line communication （PLC） network with analog network coding. We focus on the analysis of the system outage probability, symbol error rate, and average capacity. Specifically, we first derive the probability density function （PDF） of the received signal-to-noise ratio （SNR） with a closed form, by exploiting the statistical properties of the PLC channel. Then with the help of this PDF, we develop the outage probability, symbol error rate, and average capacity with closed forms, based on the Hermite polynomial. Simulations show that the derived analytical results are consistent with those by Monte Carlo simulation.

关键词： Power line communication Outage probability Symbol error rate signal attenuation

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