On the acoustoelectronic mechanism of crystallographic orientation of an incomplete electrical breakdown

The contribution of an acoustoelectronic interaction to the streamer discharge is analyzed for a model medium (cadmium sulfide crystals). The specific features of the anisotropy of the nonequilibrium phonon focusing are revealed from analyzing the results of investigating the sixth-order refracting surfaces. These features are responsible for the determinancy of individual phonon modes and permit their assignment to particular orientations of streamers of different types. It is demonstrated that, in this case, the nonlinear effects must be taken into account, primarily, the effect of a strong electric field, the accuracy in measuring the data used in the calculations, and the influence of external factors on these data. It is also necessary to analyze more informative ray velocity surfaces.