Discharges in hydrogen, ignited by wire explosion, with current amplitude up to 1.5MA were investigated. Channel diameter oscillations were observed on the photostreaks. Voltage and current curves correlated with the photostreaks. The oscillation period was proportional to the square root of the atomic number of the initiating wire material at initial gas pressure of 5-35MPa. This oscillations were associated with aligned magnetic and gas-kinetic pressures. At initial pressure of 80 - 160M Pa acoustic pressure fluctuations on the discharge chamber wall were increased up to 150M Pa and there were the growth of voltage fluctuations on the discharge gap up to 3kV simultaneously with it. Resonance of different type oscillations can produce energy density increasing in the discharge channel.
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