共查询到20条相似文献,搜索用时 0 毫秒
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Guangjun Wen Fuzhen Xie Jiayin Li Shenggang Liu 《International Journal of Infrared and Millimeter Waves》2000,21(12):2107-2113
An electromagnetic particle-in-cell code has been used to simulate the nonlinear beam wave interaction and other optimization issues of a X-band RBWO with variable couple impedance, the simulation results show: the device can high-efficiently generate microwave radiation of 950MW peak power at (9.06±O.03) GHz when it is driven by a 5KA-500KV annular electron beam, peak power efficiency is 38%. The preliminary experiment results show that the microwave-generating efficiency of the non-uniform impedance RBWO is about twice of the uniform case in the same operating conditions. 相似文献
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Fuzhen Xie Guangjun Wen Jiayin Li Shenggang Liu 《International Journal of Infrared and Millimeter Waves》1998,19(7):1037-1044
A high-power x-band coaxial relativistic backward wave oscillator has been conceptually designed and analyzed. The TMon dispersion relations in the coaxial corrugated cylindrical waveguide used in the device was calculated. MAGIC,an electronmagnetic particle-in-cell code, is being used to investigated the nonlinear beam-wave interaction and other design optimization issues. Preliminary simulation results shows that the coaxial BWO can generate 2. 2 GW peak power microwave at 10. 15GHz in the TM02 mode driven by a 600-KV 20-KA electron beam, the peak power efficiency is about 18%. 相似文献
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Bin Li Xiaofang Zhu Li Liao Zhonghai Yang Baoqing Zeng Lieming Yao 《International Journal of Infrared and Millimeter Waves》2006,27(7):941-947
Two kinds of novel helical slow wave circuit, supported by Chemical Vapor Deposition (CVD) diamond, are presented. They are
applying in miniaturized millimeter wave helical traveling wave tube. Cold test characteristic of these circuits are simulated
by MAFIA code. Higher performances are achieved with smaller size, compared with conventional circuit supported by BeO rods.
The nonlinear analysis is implemented by Beam and Wave Interaction (BWI) module, which is a part of TWTCAD Integrated Framework.
Results have been found to be consistent with the expectation. It should be wider apply in microwave and millimeter wave vacuum
electronic devices. 相似文献
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Keiichi Kamada Kouichi Nawashiro Fumiyasu Tamagawa Hisayoshi Igarashi Satiharu Kizu Cha-Yeol Lee Sunao Kawasaki Ritoku Ando Masaru Masuzaki 《International Journal of Infrared and Millimeter Waves》1998,19(10):1317-1324
A mildly relativistic electron beam (500keV, 200A, 10ns) injected into an X-band rectangular waveguide immersed in a uniform axial magnetic field (4-10kG) produced magnetically tunable microwave radiation in the 9-13 GHz frequency range with an estimated output power of 1MW. The frequency range and tunability of the radiated microwave agreed with a theoretical model for a gyrotron backward wave oscillator taking into account the low energy component of the beam electron. 相似文献
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N. M. Atakishiyev 《Annalen der Physik》1985,497(1):31-34
For the polynomial part of the radial wave function in a spherically symmetric quasipotential model of the oscillator, formulated in the relativistic configurational r-representation, the connection with the dual Hahn polynomials is found and a finite difference analogue of the Rodrigues' formula is obtained. 相似文献
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In this paper we present exact solutions of the Klein-Gordon and the Dirac equations in different configurations of an electromagnetic field, which are characteristic for free-electron laser-type gauges. In the case of motion of a charge scalar particle in standing wave an energy spectrum is studied. For the motion of an electron in a so-called wiggler magnetic field a spinor wave function is proved to be obtainable. An undulator field configuration with propagating wave is treated also. 相似文献
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On Traveling Wave Fronts in a Bacterial Growth Model with Density-Dependent Diffusion and Chemotaxis
M. B. A. Mansour 《Journal of statistical physics》2011,143(1):197-204
Bacterial colonies often generate patterns that are characterized by fingerlike projections growing out of the propagating
front. In this paper, we analyze the traveling wave fronts in bacterial growth model that accounts for chemotactic movement
as well as random motion in density-dependent diffusion. Specifically, the existence of traveling wave solutions to model
equations is examined by means of methods of local linear and nonlinear analysis, and numerical simulations. The occurrence
is shown of both sharp and smooth traveling wave fronts. 相似文献
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《Journal of Nonlinear Mathematical Physics》2013,20(1-2):161-167
Abstract A relativistic two-particle system with time-asymmetric scalar and vector interactions in the two-dimensional space-time is considered within the frame of the front form of dynamics using the dynamical symmetry approach. The mass-shell equation may be represented in terms of the nonlinear canonical realization of the Lie algebra of the group SO(2, 1). This allows us to quantize the system and to obtain a closed form for the mass spectrum. 相似文献
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In the experiment with an electron energy of ≈500 keV, the long-pulse (~300T, where T is the oscillation period) the generation regime of a relativistic Cherenkov microwave oscillator without a guiding magnetic field at a carrier frequency of 3.8 GHz has been obtained. A high-power microwave radiation pulse length of ~75 ns, a peak generation power of 210 ± 30 MW, and a power conversion efficiency of 9 ± 2% were attained. 相似文献
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The bound state solutions of the relativistic Klein-Gordon equation with the Tietz-Wei diatomic molecular potential are presented for the s wave. It is shown that the solutions can be expressed by the generalized hypergeometric functions. The normalized wavefunctions are also derived. 相似文献
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Ph. Droz-Vincent 《International Journal of Theoretical Physics》2016,55(9):4124-4141
The relativistic two-body problem is considered for spinless particles subject to an external electromagnetic field. When this field is made of the monochromatic superposition of two counter-propagating plane waves (and provided the mutual interaction between particles is known), it is possible to write down explicitly a pair of coupled wave equations (corresponding to a pair of mass-shell constraints) which takes into account also the field contribution. These equations are manifestly covariant; constants of the motion are exhibited, so one ends up with a reduced problem involving five degrees of freedom. 相似文献