wave-wave interaction
1.In this dissertation, we made theoretical study on three important aspects in detail, i.e., RF characteristics of helix Slow Wave Structure (SWS), the suppression of Backward Wave Oscillation (BWO) and self-consistent nonlinear beam-wave interaction.
2.The one dimensional and 2.5 dimensional computer codes for klystrons are used to simulate and optimized the electron optical system and beam-wave interaction system of the L band broadband continuous wave MBK.
3.The results based on the experiments under steady current and under current-wave interaction show that it is necessary to analyze the dynamic conditions of wave and current in calculation of scour depth around practical bridge piers.
4.Using the self-consistent linear field theory, Cherenkov radiation excitated by the beam-wave interaction of a thin annular relativistic electron beam in a plasma-filled, dielectric coaxial cylindrical waveguide was analyzed. The dispersion equation of the interaction, the synchronized condition and the wave growth rate were derived.
5.In principle, the linear analysis can be applied to efficiently calculating all kinds of beam-wave interaction in various Cherenkov devices composed of axisymmetric SWSs with arbitrary periodic profile.
6.Cherenkov radiation produced by an axial solid relativistic electron beam in a plasma filled dielectric lined slow wave waveguide was analyzed by the use of the self consistent linear field theory considering the three dimensional perturbation of electrons. The dispersion equation,which describes the instability,and the simultaneous condition of the beam wave interaction were derived. Finally,the growth rate of the wave was obtained,and the effects of the background plasma density and the electron beam radius on the growth rate of the wave were presented.
7.A PIC simulation is carried out using MAGIC software,which shows that the field distribution of coaxial waveguide is beneficial to the beam-wave interaction. A non-uniform coaxial BWO with high interaction efficiency of 60% and low guiding magnetic field less than 1 T is designed based on the PIC simulation.
8.A numerical method,by coupling 2-D Reynold average N-S equation and volume of fluid model(RANS-VOF) with 1-D Boussinesq model,is proposed to study the wave-structure interaction in coastal area.
10.This paper describes the quasi-3D nearshore circulation model SHORECIRC,which is coupled with the wave model REF/DIF and considers the interaction between wave and current.
