Abstract
3, a current of #1.5 MA, energy stored at 1.3 MJ, and a circuit ringing frequency of 1 kHz. A diagnostic discharge chamber was constructed to simulate gas heating in the electric discharge launcher (EDL) discharge chamber and to facilitate the use of a high-speed camera. Based on the arc dynamics study in the diagnostic discharge chamber, estimates of the temperature and conductivity of the arc channel were carried out for the EDL chamber. The measured pressure of 200 MPa and conductivity of 230 (X 3 cm) 21 correspond to temperatures of (3.3‐ 3.5) 3 10 4 K and of (2.3‐ 2.4) 3 10 4 K for the arcs, burning in copper vapor and hydrogen, respectively. The real temperature seems to lie between these two values. Since pressure equilibrium in the volume was reached, acoustic oscillations may be used to evaluate the gas temperature. The moving arc causes shock waves that are measured by pressure transducers, placed along the discharge length, and by high-speed camera photographs. The arc-to-gas energy transfer efe ciency rises along with initial H 2 pressure increase and reaches 90% for 40 MPa. Both the propagation of the shock wave and the arc radiation absorption contribute to this rise.
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