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Radiation Detection Technology and Methods 2021年第2期5卷 238-244页

作者： Liu Peng Wang Guanwen Chen Jinhui Wang Lei Shi Hua Huo Lihua Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Objective HEPS is a fourth-generation photon source under *** adopts the magnetic focusing structure of 7BA,and the beam dynamics aperture is very *** injection scheme adopts the on-axis injection *** minimize perturbation on adjacent bunches during on-axis swap out injection,a set of superfast kicker and high-voltage fast pulse power supply are *** high-voltage fast pulse power supply uses pulsed power stacking technologies,and the power supply needs the multichannel and low jitter clock ***,it is necessary to develop a precise clock *** The clock source adopts FPGA controller with full digital control,and the output pulse mode of the system can be adjusted in real time.A detection module based on program control is used to check repetition rate and bottom width of input clock and output clock in real ***-speed and precision clock signal output circuit is used to guarantee signal integrity and reduce clock signal *** The prototype experiment proves that the output clock can well meet requirements of *** minimum bottom width of the independent clock is 5 ns,the minimum time interval of the two groups of clocks is 5 ns,and the jitter of output clock is lower than 50 *** developed clock source can well meet the application requirements of high-voltage fast pulse power supply in HEPS injection system.

关键词： HEPS Kicker clock source High-voltage fast pulse power supply Low jitter

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Reliability Analysis of clock source of Railway Time Synchronization Network Based on SPN

Reliability Analysis of Clock Source of Railway Time Synchro...

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作者： Hai Ning Zhang Cai-zhen Yu Yang Tang Yan LanZhou JiaoTong University

Railway time synchronization network is an important part of railway communication *** provides unified and standard time information for railway *** the timing reference signal source of railway time synchronization network,the reliability of clock source is the basis to ensure the accuracy and precision of the time information of railway time synchronization *** it is of great significance to do the study about the reliability of clock source to the realization of railway time *** accordance with failover principle,in this thesis,three levels master clock failover models were established by using Stochastic Petri Nets（SPN） first,and then the TimeNET software was used to check structure and analyze steady state of *** analysis results showed that master clocks of all levels with high reliability can meet the requirements of clock source of railway time synchronization netw ork.

关键词： Railway Time Synchronization Network clock source SPN Reliability Analysis

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