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Microwave radiation of two passing or counter electron beams promising for amplification and generation of microwaves in regime of electronic mode as well as for energy extraction using directional radiation. In the two-beam devices on the passing beams amplification determined by the longitudinal beams interaction with different speed. Usage of counter beams allows us to consider the generation of...
The technique of resonance effects analysis in the quantum exchange interaction of the electron and positron flows is developed. At the framework of macroscopic quantum theory conducted a joint decision of the Schrödinger and Poisson equations for the macroscopic wave function of the electrons and positrons. Resonance effects in the quantum exchange interaction leads to self-organization of the active...
With the help of the finite-difference equation of excitation of periodic waveguides obtained the characteristic equation of the electron waves formed by the interaction of an electron beam with the forward and backward electromagnetic waves periodic slow-wave systems (SWS). The resulting characteristic equation describes the electron-wave interaction in the passband and stopband of periodic SWS....
A nonlinear steady-state multimode theory is developed to investigate mode competition in gyro-TWT. Calculation shows that competition mode may be suppressed by a large driving power in a particular range.
A three-dimensional (3-D) large signal model of beam-wave interaction in a folded waveguide (FW) slow wave circuit is described. The 3-D code carries out with numerical solutions of the structure, without using the analytical formulations of the eigenmodes. This model can also be used in helix TWTs and coupled-cavity TWTs.
Analysis of a quadrupole focusing lattice for high-frequency TWT's is presented. Single particle tracking is performed to determine the phase advance, with the eventual goal of determining the advantageous frequency regime for devices using this focusing method. This work is motivated by recent work which demonstrated an advantageous case for strong focusing employing a Halbach quadrupole lattice.
We consider the possibility to replace an electron beam (EB) by a "hot" equivalent capacitance that will make it possible to use "hot" equivalent circuits and long lines for analysis the EB interaction in TWTs. A sheet EB in the field of the in-phase mode of the slow wave excited by coupled impedance electrodes is considered in this paper.
Effect of reflection from the output window on the mode competition in gyrotron is investigated using the equations of quasilinear theory for slowly varying amplitudes of the modes with time delayed terms. Stability analysis of single-mode operation shows that the reflections can, under the certain conditions, strongly affect the operation regime.
This work introduces a conformal finite difference time domain (CFDTD) particle-in-cell (PIC) method with an improved field emission algorithm to accurately and efficiently study field emission devices. The CFDTD method is based on the Dey-Mittra algorithm or cut-cell algorithm, as implemented in the Vorpal code. For the field emission algorithm, we employ the elliptic function v(y) found by Forbes...
The paper presents the design study of a diode type Magnetron Injection Gun (MIG) operating at W-band and Y-band. The design study has been done by two different simulation codes, EGUN code and CST Particle studio. We will present crucial design parameters for optimizing geometry of MIG and the simulation results with respect to dual band.
An analytical model is presented for the double slot coupled cavity slow-wave structure (CCSWS) in this abstract. By matching boundary conditions in conjunction with Green's function techniques and moment method (MOM), the formulae for discussing the high frequency characteristics of the SWS, including dispersion and coupling impedance, are given.
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