Simulation of the ribbon-shaped electron beam of the diode electron-optical system of microwave devices
Complex numerical simulation of the ribbon-shaped electron beam, which is formed by the diode electron gun with magnetic field focusing was conducted. Analysis of the beam formation dynamics in longitudinal and cross-section as well as the results of calculation of the separate electron trajectories agree with experimental data, obtained previously by using of the method of electron beam diagnostics by means of transient radiation.
Optimization of a ribbon diode with magnetic insulation for increasing the current density in a high-current relativistic electron beam
The geometry of the ribbon diode of the U-2 accelerator is optimized to increase both the current density and the total current of the relativistic electron beam for its subsequent injection into the plasma of a multimirror GOL-3 trap. Beam simulation in the diode was performed using the POISSON-2 applied software modified on the basis of the results obtained using the theory of a planar diode in an inclined magnetic field. As a result of the optimization, the diode geometry and the magnetic field configuration were found that should provide a factor of 1.5–2 increase in the current density in experiments with a small angular divergence of electron velocities.
A Study of the Changes Over Time in State Anxiety in a Computer-Assisted Instructional Program
The purposes of this study were to analyze (1) the changes over time in the state anxiety level of children in a computer-assisted program of reading instruction and in classroom reading instruction, (2) the changes in state anxiety patterns as related to gender, achievement level, and ethnicity, and (3) the difference in anxiety levels of the students while in computer-assisted reading instruction and classroom reading instruction.