Abstract
This paper describes time resolved spectroscopic experiments in which the average thermodynamic state across the diameter of the accelerated argon plasma generated in a 3 in. dia. conical type electromagnetic shock tube was determined at ambient pressures of 50 μ, 300 μ, and 1 mm Hg and at positions of 15·25 cm, 20 cm and 35·5 cm downstream from the ring electrode. Luminous front velocities ranged from 0·25 to 1 cm/μsec, temperatures from 13,000 to 18,000°K and peak electron densities from 10 16 to 10 17 cm -3. The data indicate complete thermodynamic equilibrium. In all tests the temperatures were significantly higher than those predicted by the shock equations assuming a cold gas ahead of the luminous front. Microwave transmission measurements indicate that the electron density ahead of the luminous front is less than 5×10 10 cm -3. It is concluded that luminosity of the kind observed is from the driver plasma or a mixture of the driver and driven plasmas, depending on the ambient pressure, and that the thermodynamic state of the accelerated plasma must therefore be determined experimentally.
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