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Mathematical models for DC bias vibration analysis of the transformer winding are developed. The model is combined into multi-physical field coupling modeling for vibration analysis of the transformer. By applying the primary voltage as excitation and under different DC bias, vibration of the transformer winding is simulated and analyzed. The simulation results verify the method which is proposed...
This paper presents a simulation of Smith-Purcell (SP) radiation from dielectric loaded grating (DLG) at terahertz frequencies, which is performed by using a two-dimensional (2D) particle-in-cell (PIC) code. The simulation supposes a continuous electron beam passing over a DLG and metal grating, respectively. The results show that compared with metal grating, the usage of DLG can enhance the radiation...
The sheet electron beam focused by periodic cusped magnetic (PCM) focusing structure could transport more stable than uniform magnetic field because of diocotron instability. We simulated, fabricate and test a w sheet electron beam klystron with multi-gaps extended interaction cavities. To obtain particular intensity of magnetic field, two pieces of PCM focusing structure had a short distance, and...
Based on single-particle model, the propagation of hollow beam electronics was analyzed by calculating the outer electronic motion equation. In the condition without the magnetic field, the relation of the radial motion depending on beam radius and voltage values was indicated and the physical reason was addressed. In this paper, the motion equation of outer electrons was deviated to explain the influence...
The design of an electron optics system for the W-band extended-interaction klystron was described. A cylindrical electron beam with voltage 17-kV, current 700mA was produced by a Pierce-type gun and was guided by a single-period permanent magnet focusing structure. The design is accomplished with the 3-D simulation code CST.
A new defect structure of two-dimensional magnetic-photonic crystal is given and a new three-port Y-junction circulator using a ferrite cylinder is proposed in this paper. The results show that there is a significant improvement for insertion loss and isolation compared with those in literatures.
For the development of Electron Optics System (EOS) for Extended Interaction Amplifier (EIA) at frequency of 330GHz, the parameters of EOS are studied with a help of EGUN and Superfish. The design of EOS and permanent magnetic field for EIA has been conducted. The simulation results show that electron beam has highly pass rate, low ripple and good laminarity.
The THz folded waveguide (FWG) traveling wave amplifier (TWA) which is regarded as an important source in vacuum electronics is developed at Institute of Electronics, Chinese Academy of Science (IECAS). In this scheme, the circular electron beam is adopted, which can be gained the high current density of electron beam by the confined and immersed magnetic field. The folded waveguide high frequency...
This paper presents the simulation study of a C band klystron with a disc-load waveguide traveling wave output structure. The electron gun with a perveance of 1.5μp is designed. A 3-cell disc-loaded waveguide output structure working at π/2 mode is adopted in the circuit design. The beam-wave interaction system with disc-loaded waveguide output structure is simulated by PIC code. More than 50MW output...
The transport of an elliptic sheet electron beam with uniform density in uniform magnetic field is investigated by making use of a macroscopic cold-fluid model. General envelope equations and beam twisted angles are derived. In particular, the tilt of the elliptic sheet beam was numerically calculated by an example of W-band sheet beam klystron.
In this paper, the ponderomotive focusing forces are derived for a sheet electron beam in both periodic cusped magnetic and wiggler magnetic field configurations, which has a large aspect ratio, using two-time scale analytical method.
Simulations of the electron optics system and beam wave interaction system for W-band Sheet Beam Klystron (SBK) were done and a beam stick was fabricated. Under the beam voltage of 60 kV and current of 2.6 A, the beam transmission has achieved 99%. In this paper the results of both simulation and experiment are described.
The diocotron instability of a relativistic sheet electron beam propagating through a uniform magnetic field is studied using a macroscopic cold fluid model. The general eigenvalue equation is obtained for low-frequency perturbations. In the limit of a long axial wavelength, a dispersion relation is derived for the special case of a sharp boundary density profile and used to study stability properties...
A conformal scheme is presented for FDTD simulation of arbitrarily shaped thin good conductors. The conformal scheme is based on the surface impedance model combined with conformal thin PEC and conformal good conductor techniques. The simulation results show that the conformal scheme is stable and accurate for a range of thickness of the thin good conductors.
In this paper, a novel structure of non-planar inductor based on silicon is presented. The simulation plot of the magnetic distribution reveals that magnetic field reaches its maximum intensity near the inner turns of planar inductor, so it is necessary to deal with the peak value of the magnetic field in the centre of the inductor which causes great substrate loss. An extra layer of silicon dioxide...
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