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STUDIES ON AN INERT GAS DISK HALL GENERATOR DRIVEN IN A SHOCK TUNNEL.
AVCO EVERETT RESEARCH LAB INC EVERETT MA
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A theoretical and experimental study of the plasma properties and fluid mechanics of a large disk magnetohydrodynamic generator driven by high temperature argon seeded with cesium is presented. With a high initial degree of ionization of the seed, theoretical and experimental results indicate a quiescent behavior of the plasma and the generator performance matches the expectation based on the local values of conductivity and Hall coefficient. With a low initial degree of ionization of the seed, nonequilibrium ionization is experimentally observed but is accompanied, as theoretically expected, by large electron density fluctuations. The existence of a long relaxation length and density fluctuations lead to a reduction of the generator performance. The maximum effective Hall coefficient is found to be equal to two, as could theoretically be expected for a plasma with large isotropic fluctuations. Author
APPROVED FOR PUBLIC RELEASE