GENERATION OF ION-ACOUSTIC-WAVES AND SUPPRESSION OF HEAT-TRANSPORT DURING PLASMA-HEATING BY AN ELECTRON-BEAM

The dynamics of an initially uniform plasma heated by a microsecond re lativistic electron beam in a solenoid are considered. A set of one-di mensional equations of motion, continuity, and heat transport for a pl asma in a long solenoid is used to solve the problem. The initial and boundary conditions of the numerical model correspond to those in the GOL-3 device. A comparison of the data obtained from the model with ex perimental results shows that, during beam injection, the plasma therm al conductivity is suppressed by two or three orders of magnitude. In the plasma-cooling stage, the plasma temperature decay can be adequate ly described in terms of classical electron heat transport onto the en ds of the device. The processes of generation and propagation of large -amplitude ion-acoustic waves an also observed.