The Influence of Stress on Electron Emission Initiated by a Shock Wave from a Heterogeneous Material (Granite)

摘要

An electrical breakdown of the air near the surface of a compressed granite plate initiates a shock wave in it. Having reached the back side of the plate, the shock wave causes successive (with an interval of similar to 50 ns) emission of plasma jets presumably consisting of positively charged ions. The intensities of the jets are distributed exponentially. While the compression pressure P does not exceed similar to 0.9-0.95 of the failure pressure P-f, it does not affect the number and efficiency of the radiation sources. At P approximate to (0.9-0.95) P-f, the shock wave causes the emergence of a crack destructing the sample. Simultaneously, the number and efficiency of ion sources increase 3-4-fold. This phenomenon is explained by an increase in the concentration of clusters of dislocations upon the creep of the sample.