Magnetic probe diagnostics in powerful high pressure discharge
Experiments with magnetic probe diagnostics in gas discharge with current amplitude up to 1 MA, current rise rate ~ 10 10 A/s, with energy input up to 300 kJ and at initial pressure up to 30 MPa were carried out. Discharge was initiated by copper wire explosion. Discharge chamber was designed with axisymmetric geometry. Capacity of energy storage was changed. It was 1.2, 2.4 or 4.8 mF. Charging voltage was varied from 1 to 15 kV. Energy input was up to 300 kJ. The original construction of magnetic probe, working in condition of high current high pressure discharge with extreme heat and shock load, had been designed and created. Operation testing of magnetic probe under this papameters had been performed. Measurements of current density distribution had been carried out. According to the experiments the current channel radius was reduced with increasing initial gas density. The discharge channel was localized around the axis of discharge chamber. The channel radius was not exceeding 10 mm for investigated pressure and current ranges.