Abstract
Previously (JASA 121 pt.2, p. 3181) transient cavitation in high pressure spherical resonators was described. The phenomenon is characterized by cavitation events lasting a few ms (100 s acoustic cycles) in which a cavity (or cavities) collapse violently, emitting flashes of light of widths ∼1–40 nsec and spherical shock waves with amplitudes ∼1–100 bars (depending on the static pressure) at a distance of 10 cm from the collapse. Both SL and shock amplitudes are proportional to the static pressure. The goal of these experiments is to investigate how the static pressure increases the intensity of acoustic cavitation collapse and whether thermonuclear fusion reactions are possible this way. The determination of plasma temperatures, pressures, and densities is therefore critical in making progress. Furthermore, the amplitude and velocity of the shock waves can be used to determine the conditions at stagnation (end of collapse), assuming the cavity size at that time is known. To this end, results of numerical simulations using HYADES plasma physics hydrocode will be presented, with emphasis on the plasma conditions versus the amount of gas in the cavity and the static pressure, as well as the amplitude and velocity of the outgoing shock waves generated after the collapse [Work supported by SMDC Contract No. W9113M‐07‐C‐0178.]
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