Abstract
Tracks from ionizing particles in liquid helium have been obtained at CERN using pulsed ultrasonic fields in the frequency range 100–400 kHz [R. C. A. Brown, H. J. Hilke, and A. H. Rogers, Nature 220, 1177–1178 (1968)]. However, with liquid hydrogen, ultrasonic techniques have so far only produced tracks when supplemented by some piston-produced expansion of the liquid [R. C. A. Brown, G. Harigel, and H. J. Hilke, Nucl. Instrum. Methods 82, 327–330 (1970)]. Experiments to define the optimum conditions for bubble growth and recompression in liquid helium have shown that a liquid-helium ultrasonic bubble chamber should be able to achieve a repetition rate of 100 Hz. Current developments are intended to produce a fast-cycling hydrogen bubble chamber sensitized purely by ultrasonic waves. A sound pressure amplitude of about 3 atm is required to do this, whereas only about 0.3 atm is needed for liquid helium.
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