Generation of 100GPa pressure by underwater cylindrical wire array explosion

Summary form only given. Generation of ultra-high pressure, temperature and density at the axis of converging cylindrical shock wave produced by underwater electrical wire array explosion will be reported. A pulsed sub-microsecond high-current generator with stored energy of ~4.2 kJ and current amplitude of ~340 kA with a rise time of ~lμs was used for underwater explosion of 40 Cu-wire cylindrical array. The velocity of the generated shock wave was obtained by analyzing the sequence of shadow images acquired by a multi frame fast framing camera. The time and space-resolved spectral characteristics of the shock wave self-emission were studied using an imaging spectrometer and photomultiplier tubes. Assuming black body radiation, a temperature up to 5000 K was found at the shock wave front at radius of implosion r≤10 μm. A comparison of the experimental and ID HD simulation results showed that at r≤10 μm. the pressure reaches 100 GPa and density of water of 3.5g/cm³. The duration of this high-density and high-pressure state of water was found to be ~5ns. Results of investigation of water in extreme conditions produced in experiments using a generator with a current amplitude and rise time of ~800 kA and 350 ns, respectively, will be reported as well.