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A kind of compact ultra-broad bandpass planar terahertz filter

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Science China(Information Sciences) 2018年第6期61卷 247-249页

作者： Renbin ZHONG Hong DING Yan liu shenggang liu Terahertz Research Center School of Physical Electronics University of Electronic Science and Technology of ChinaCooperative Innovation Centre of Terahertz Science State Key Laboratory of Millimeter Waves University of Hong Kong

Dear editor,With effective controllability on the asymptotic frequency,mimicking surface plasmon polaritons(MSPPs)device can perfectly confine electromagnetic(EM)field in subwavelength scale with high intensity from m... 详细信息

关键词： THz A kind of compact ultra-broad bandpass planar terahertz filter Figure

Two Mechanisms in a Relativistic Electron Cyclotron Maser with a Special Quasioptical Cavity

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Chinese Physics Letters 1995年第10期12卷 597-600页

作者： liu Pukun YANG Zhonghai liu shenggang QIAN Shangjie Institute of High Energy Electronics University of Electronic Science and Technology of ChinaChengdu 610054 Southwestern Institute of Physics Chengdu 610041

In a relativistic electron cyclotron maser with an axisymmetrical quasioptical cavity of oblique rotation at arbitrary angle,the rotating angle has a great influence on beam-wave *** different physical mechanisms are found with the rotating angle ranging from 0°to 90°.One is cyclotron auto-resonance maser regime for small angle,with small optimized external magnetic field;the other is electron cyclotron resonance maser regime for large angle,with comparatively large optimized magnetic field.

关键词： angle rotating Electron

Effect of Longitudinal Momentum Spread in Ion-Ripple Laser

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Chinese Physics Letters 1994年第3期11卷 149-152页

作者： liu Pukun QIAN Shangjie TANG Changjian liu shenggang Southwestern Institute of Physics P.O.Box 432Chengdu 610041 Institute of High Energy Electronic University of Electronic Science and Technology of ChinaChengdu 610054

Using kinetic coupling mode theory of three waves,the effect of longitudinal momentum spread in ion-ripple laser(IRL),which is an advanced new scheme to generate tunable-coherent radiation with frequency ranging from microwaves to x-rays,is *** a Gaussian distribution in beam longitudinal momentum,the results show that the growth rate of IRL falls off rapidly with increasing momentum spread,and the momentum spread causes linear damping of beam space-charge wave,weakening the beam-radiation mode coupling and lowering the output radiation frequency apart from broadening the radiation *** dispersion relation and phase matching conditions are also obtained.

关键词： momentum beam coupling

PIC simulation study of electron gun with rotational surface cathode

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Frontiers of Electrical and Electronic Engineering in China 2011年第4期6卷 556-562页

作者： Weihao liu shenggang liu Center of Terahertz Science and Technology School of Physical ElectronicsUniversity of Electronic Science and Technology of ChinaChengdu 610054China

The electron gun with rotational surface cathode is presented to improve the laminarity of the converging electron beams in this paper,and the function expression of the rotational surfaces is *** results of particle in cell(PIC)simulation indicate that anode-hole spherical aberration is the major cause for the nonlaminarity of the electron *** properly choosing the size of the shape,rotational surface cathode can effectively counteract the effect of the anode-hole spherical aberration and enhance the laminarity of the electron *** theoretical analysis was carried out for the explanation of the phenomenon that appeared in the PIC simulation.

关键词： rotational surface cathode laminarity anodehole spherical aberration

A new type of wave in waveguide filled with magnetized plasma

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Chinese Science Bulletin 1999年第15期44卷 1360-1363页

作者： shenggang liu Yang Yan Dajun Zhu Univ Elect Sci & Technol China Chengdu 610054 Peoples R China

A new type of wave containing quasi-static part is found and studied. Characteristics of this wave are analyzed, and the theoretical analysis is consistent with the numerical calculation.

关键词： magnetized plasma waveguide quasi-static new type of wave.

THE EFFECTS OF WEAK SELF-FIELDS ON ELECTRON ORBITS FOR A FREE ELECTRON LASER

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Chinese Physics Letters 1989年第10期6卷 444-447页

作者： liu shenggang YU Junsheng HUANG Lin University of Electronic Science and Technology of China Chengdu 610054 Southwestern Institute of Physics Leshan614007

A set of coupled equations for electron motion and the dispersion relation of electromagnetic wave(wiggler)in electron beam are *** instability of steady-state electron orbits is reduced to the problem of the fourth-order and fifth-order linear ordinary differential *** is found that the presence of self-fields plays an important role in determining the behaviour of stable electron orbits.

关键词： equations LASER ordinary

Study on a 60 kV/5 A magnetron injection gun for 200 GHz electron cyclotron master

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Frontiers of Electrical and Electronic Engineering in China 2009年第4期4卷 440-445页

作者： Wenjie FU Yang YAN shenggang liu THz Research Center School of Physical ElectronicsUniversity of Electronic Science and Technology of ChinaChengdu 610054China

To develop 200 GHz electron cyclotron maser(ECM)in University of Electronic Science and Technology of China,a magnetron injection gun(MIG)with 60 kV/5 A has been *** behavior of the designed magnetron injection gun with variations of relevant parameters is given in detail by means of computer *** preliminary and operation parameters of the gun are *** optimization by using the EGUN code shows that the ratio of the perpendicular velocity to the parallel velocity of the electron beam is 1.63,and the perpendicular and parallel velocities spread are 2.62%and 6.63%,respectively.

关键词： electron cyclotron maser(ECM) magnetron injection gun(MIG) trade-off equations

Higher Harmonics in Free Electron Laser with a Two-Wavenumber Plane Wiggler Magnetic Field

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Chinese Physics Letters 1993年第4期10卷 223-226页

作者： LU Bo YANG Zhonghai liu shenggang YU Junsheng Institute of High Electronics University of Electronic Science and Technology of ChinaChengdu 610054 Southwestern Institute of Physics P.O.Box 432Chengdu 610041

The higher harmonics of the free electron laser(FEL)with a two-wavenumber plane wiggler magnetic field,which may induce a lot of higher harmonics,are *** a two-wavenumber wiggler comprised of two separate periodicities,k_(ω)and k_(ω)+Δk,numerical simulations show that the higher harmonic may be amplified and the first harmonic may be suppressed in this kind of FEL with an optimized parameterΔ*** coupling coefficient and gain coefficient in low-gain regime of the harmonic are also obtained.

关键词： harmonic harmonics number

THE LONG PULSE EFFECT IN FREE ELECTRON LASERS

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Journal of Electronics(China) 1989年第3期6卷 286-289页

作者： Wang Changbiao (1) liu shenggang (1) 1. Chengdu Institute of Radio Engineering Chengdu

The spontaneous radiation from a single pulse electron beam in Free Electron Lasers is dealt withby solving one-dimensional wave *** obtained results show that there is the long pulse effect aswell as the well-known s... 详细信息

关键词： Free electron laser Spontaneous radiation Long pulse effect