Abstract
The present work is devoted to the study of the properties of the shock wave, appearing in a fast cylindrical discharge (dI/dt about 1012 A/s). The phenomenon under study is the influence of the preionization current (about 500 A) upon the evolution of the shock wave. The discharge was produced in an alumina tube with inner diameter 6 mm, filled with argon to pressures ranging from 80 to 320 Pa. The shock wave was detected from the vacuum ultra violet emission of the hot plasma behind the front, using a pin-hole camera and a microchannel plate detector with a gating time of 10 ns. The measured velocities of the shock wave front are in the range (1–4) × 106 cm/s. The main effect of the preionization is the earlier start of the shock wave from the inner surface of the alumina discharge tube and about 1.5 times increase of the velocity of the front. The time delay of the shock wave cumulation in the absence of the preionization results in the appearance of the eroded wall material in the plasma.
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