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Nuclear Science and Techniques 2022年第3期33卷 113-125页

作者： Xiao-Wen Zhu Claude Marchand Olivier Piquet Michel Desmons IRFU CEAUniversite´Paris-Saclay91191 Gif-sur-YvetteFrance

Compact accelerator-based neutron source facilities are garnering attention and play an important and expanding role in material and engineering sciences,as well as in neutron science education and training.Neutrons are produced by bombarding a low-energy proton beam onto a beryllium or lithium target.In such an acceleratorbased neutron source,a radio frequency quadrupole(RFQ)is usually utilized to accelerate a high-intensity proton beam to a few MeV.This study mainly covers the highfrequency structure design optimizations of a 4-vane RFQ with pi-mode stabilizer loops(PISLs)and its RF stability analysis.A 176 MHz RFQ accelerator is designed to operate at a 10%duty factor and could accelerate an80 mA proton beam from 65 keV to 2.5 MeV within a length of 5.3 m.The adoption of PISLs ensures high RF stability,eases the operation of the accelerator,and implies less stringent alignment and machining tolerances.

关键词： Accelerator-based neutron source 4-vane RFQ accelerator Pi-mode stabilizer loops Perturbative analysis electromagnetic design Multipacting simulation

An electromagnetic Perspective of Artificial Intelligence Neuromorphic Chips

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electromagnetic Science 2023年第3期1卷 50-67页

作者： Er-Ping Li Hanzhi Ma Manareldeen Ahmed Tuomin Tao Zheming Gu Mufeng Chen Quankun Chen Da Li Wenchao Chen ZJU-UIUC Institute College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310000China

The emergence of artificial intelligence has represented great potential in solving a wide range of complex problems.However,traditional general-purpose chips based on von Neumann architectures face the“memory wall”problem when applied in artificial intelligence applications.Based on the efficiency of the human brain,many intelligent neuromorphic chips have been proposed to emulate its working mechanism and neuron-synapse structure.With the emergence of spiking-based neuromorphic chips,the computation and energy efficiency of such devices could be enhanced by integrating a variety of features inspired by the biological brain.Aligning with the rapid development of neuromorphic chips,it is of great importance to quickly initiate the investigation of the electromagnetic interference and signal integrity issues related to neuromorphic chips for both CMOS-based and memristor-based artificial intelligence integrated circuits.Here,this paper provides a review of neuromorphic circuit design and algorithms in terms of electromagnetic issues and opportunities with a focus on signal integrity issues,modeling,and optimization.Moreover,the heterogeneous structures of neuromorphic circuits and other circuits,such as memory arrays and sensors using different integration technologies,are also reviewed,and locations where signal integrity might be compromised are discussed.Finally,we provide future trends in electromagnetic interference and signal integrity and outline prospects for upcoming neuromorphic devices.

关键词： Signal integrity electromagnetic interference electromagnetic design Neuromorphic chips Heterogeneous integration

design of a 200-MHz continuous-wave radio frequency quadrupole accelerator for boron neutron capture therapy

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Nuclear Science and Techniques 2021年第3期32卷 1-10页

作者： Zhi-Chao Gao Liang Lu Chao-Chao Xing Lei Yang Tao He Xue-Ying Zhang Institute of Modern Physics Chinese Academy of ScienceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China The Sino-French Institute for Nuclear Energy and Technology Sun Yat-sen UniversityZhuhai 519000China

A high-intensity continuous-wave(CW) radio frequency quadrupole(RFQ) accelerator is designed for boron neutron capture therapy.The transmission efficiency of a 20-mA proton beam accelerated from 30 keV to 2.5 MeV can reach 98.7% at an operating frequency of 200 MHz.The beam dynamics have a good tolerance to errors.By comparing the high-frequency parameters of quadrilateral and octagonal RFQ cross sections,the quadrilateral structure of the four-vane cavity is selected owing to its multiple advantages,such as a smaller cross section at the same frequency and easy processing.In addition,tuners and undercuts are designed to tune the frequency of the cavity and achieve a flat electric field distribution along the cavity.In this paper,the beam dynamic simulation and electromagnetic design are presented in detail.

关键词： RFQ accelerator BNCT Dynamic simulation electromagnetic design

design of the poloidal field system for KTX

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Plasma Science and Technology 2018年第11期20卷 126-134页

作者：尤玮李弘毛文哲白伟涂翠罗兵李子超阿迪里江胡金童肖炳甲杨庆喜谢锦林兰涛刘阿娣丁卫星肖持进刘万东 KTX Laboratory and Department of Modern Physics University of Science and Technology of ChinaHefei 230026 People's Republic of China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230026 People's Republic of China Department of Physics and Astronomy University of California at Los Angeles Los Angeles CA 90095United States of America Department of Physics and Engineering Physics University of Saskatchewan SK S7N 5N2 Canada

The design of the poloidal field （PF） system includes the ohmic heating field system and the equilibrium （EQ） field system, and is the basis for the design of a magnetic confinement fusion device. A coupling between the poloidal and plasma currents, especially the eddy current in the stabilizing shell, yields design difficulties. The effects of the eddy current in the stabilizing shell on the poloidal magnetic field also cannot be ignored. A new PF system design is thus proposed. By using a low-μ material （μ = 0.001, ε = 1） instead of a conductive shell, an electromagnetic model is established that can provide a continuous eddy current distribution on the conductive shell. In this model, a 3D time-domain problem with shells translates into a 2D magnetostatic problem, and the accuracy of the calculation is improved. Based on these current distributions, we design the PF system and analyze how the EQ coils and conductive shell affect the plasma EQ when the plasma ramps up. To meet the mainframe design requirements and achieve an efficient power-supply design, the position and connection of the poloidal coils are optimized further.

关键词： RFP KTX poloidal field system electromagnetic design

Performance Evaluation of a 60kW IPM Motor for Medium Commercial EV Traction Application

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CES Transactions on Electrical Machines and Systems 2019年第2期3卷 195-203页

作者： Zhenyang Zhang Huijuan Liu Tengfei Song Qian Zhang Wenluan Hu Wei Liu School of Electrical Engineering Beijing Jiaotong UniversityBeijing100044 China

This paper presented the design and performance analysis of a 60kW interior permanent-magnet(IPM)synchronous motor used as traction drive in a medium commercial electric vehicle(EV),according to the traction requirements of the electric vehicle under the rated operating conditions and overload conditions.The key dimensions were calculated on the basis of the permanent-magnet(PM)motor theory,and the 2D finite element method(FEM)simulation model of the IPM motor was built by using 2D Maxwell software.The influence geometric structures of the IPM motor including the PM dimensions and skewed PMs on electromagnetic torque were investigated,and the temperature distribution of the motor under rated operating condition and the condition of maximum speed were calculated.Finally,the simulation results of the IPM motor running in various operating modes were compared with the experimental results,which demonstrated that the designed IPM motor can match all requirements of the medium commercial electric vehicle driving applications.

关键词： Electric vehicle IPM motor electromagnetic design FEM traction motor.