Design of gridded sheet beam electron gun
A sheet beam gun with spoke grid is designed with EOS [1][2]. The results between with spoke grid and without spoke grid have been compared under the same wiggler magnetic field. When there is spoke grid, the electron beam will have a strong fluctuation in the narrow planar, but will not have great impact in the broad planar.
The Design of Elliptical Sheet Beam Electron Gun
Sheet beam klystrons, like multi-beam klystrons, have many advantages such as decreased beam voltage, reduced power densities, lower voltage gradients and increased bandwidth (Basten and Booske, 1999). As a function of frequency, the power output of a sheet beam klystron falls only linearly with wavelength, making it more suitable for high frequency applications (Scheitrum, 2005; and Read et al., 2005). The generating, forming and focusing of electron beam is one of the key technologies of the sheet beam klystrons. Elliptical sheet beams are easy to focusing than rectangular sheet beams. The paper describes the considerations of designing elliptical sheet beam electron gun.
Mathematical Simulation of Combustion of Boron Powder Gas Suspension
Based on a two-phase two-velocity model of a reacting gas-dispersed medium, a mathematical model of combustion of a boron powder gas suspension has been formulated. The results of numerical solution of the problem are presented. The influence of the composition of the gas suspension, its size, size distribution of particles, mass concentration of particles, as well as of the presence of aluminum powder in the suspension on the visible and normal velocities of flame propagation in the gas suspension, is shown. A comparison of the results of calculation with the well-known experimental and theoretical data is carried out. Satisfactory agreement of the predicted results with experimental data is shown.