Simulation of the twostream convective instability
Abstract
A ring/disk model is used in numerical experiments to investigate the twostream convective instability in a cylindrically symmetric system with finite transverse dimensions. The spatial growth rates obtained in the linear region agree well with the predictions of the linear theory. The development of a vortex structure in velocityphase space is associated with the saturation of the instability. Generation and amplification of harmonics occur abundantly as expected. The two electron streams exchange kinetic energy over a very short distance and become thoroughly mixed and randomized (thermalized). Due to the choice of geometry, no coherent oscillations are established in the transverse plane, and although they increase, the radial and angular kinetic energies remain much less than the axial.
 Publication:

Physics of Fluids
 Pub Date:
 June 1974
 DOI:
 10.1063/1.1694850
 Bibcode:
 1974PhFl...17.1109B
 Keywords:

 Convective Flow;
 Electron Beams;
 Kinetic Energy;
 Magnetohydrodynamic Stability;
 Mathematical Models;
 Computer Techniques;
 Electric Fields;
 Energy Transfer;
 Harmonic Analysis;
 Particle Interactions;
 Plasma Cylinders;
 Plasma Frequencies;
 Vortices;
 Plasma Physics