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国家自然科学基金(10876005)

作品数:4 被引量:4H指数:1
相关作者:金晓林杨中海黄桃廖平更多>>
相关机构:电子科技大学更多>>
发文基金:国家自然科学基金国家教育部博士点基金青年科技基金更多>>
相关领域:理学电子电信更多>>

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Nonlinear time-dependent simulation of helix traveling wave tubes
2011年
A one-dimensional nonlinear time-dependent theory for helix traveling wave tubes is studied. A generalized electromagnetic field is applied to the expression of the radio frequency field. To simulate the variations of the high frequency structure, such as the pitch taper and the effect of harmonics, the spatial average over a wavelength is substituted by a time average over a wave period in the equation of the radio frequency field. Under this assumption, the space charge field of the electron beam can be treated by a space charge wave model along with the space charge coefficient. The effects of the radio frequency and the space charge fields on the electrons are presented by the equations of the electron energy and the electron phase. The time-dependent simulation is compared with the frequency-domain simulation for a helix TWT, which validates the availability of this theory.
彭维峰杨中海胡玉禄李建清陆麒如李斌
关键词:TIME-DEPENDENTHARMONICS
A three-dimensional time-dependent theory for helix traveling wave tubes in beam-wave interaction
2011年
This paper presents a three-dimensional time-dependent nonlinear theory of helix traveling wave tubes for beam- wave interaction. The radio frequency electromagnetic fields are represented as the superposition of azimuthally sym- metric waves in a vacuum sheath helix. Coupling impedance is introduced to the electromagnetic field equations' stimulating sources, which makes the theory easier and more flexible to realize. The space charge fields are calculated by electron beam space-charge waves expressed as the superposition solutions of Helmholtz equations. The focusing forces due to either a solenoidal field or a periodic permanent magnetic field is also included. The dynamical equations of electrons are Lorentz equations associating with electromagnetic fields, focusing fields and space-charge fields. The numerically simulated results of a tube are presented.
彭维峰胡玉禄杨中海李建清陆麒如李斌
电子回旋共振放电中电子能量分布特性的研究
2009年
建立了电子回旋共振(ECR)放电的粒子模型,编制了准三维电磁模粒子模拟与蒙特卡罗模拟程序。通过对氩气ECR放电电离过程的理论分析与数值模拟,得到了放电稳态形成时不同放电区域的电子能量分布。研究了不同中性气压以及外加磁场位形对这些区域中电子能量分布特性的影响。随着中性气压的升高,远离ECR区域中的低能电子减少,高能电子增加,而ECR区域中电子能量分布变化特征与之相反;相对于收敛磁场位形,磁镜磁场位形更有利于约束放电下游区的电子能量以及电子能量分布的宽度。
杨中海金晓林
关键词:电离蒙特卡罗方法
电子回旋共振放电中电子与微波互作用特性的粒子模拟和蒙特卡罗碰撞模拟被引量:4
2009年
对电子回旋共振(ECR)放电电离过程中的电子与微波互作用特性进行了理论分析与数值模拟.采用粒子模拟(PIC)方法描述带电粒子与微波的互作用,采用蒙特卡罗碰撞(MCC)方法描述粒子间碰撞过程及带电粒子与边界的相互作用.编写了准三维的PIC/MCC数值模拟程序,并对放电过程中电子能量与微波场随时间、空间的演化进行了数值诊断.
金晓林黄桃廖平杨中海
关键词:蒙特卡罗方法电离
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