Abstract
We assume that the particles in a high-energy beam from an accelerator or other source deposit heat in a water target. This localized heating causes thermal expansion, giving rise to a radiated pressure wave. We calculate the acoustic intensity at points far from the beam. Earlier work [P. J. Westervelt and R. S. Larson, J. Acoust. Soc. Am. 54, 121–122 (1973)], treated the specific case of a narrow, cyclindrical, exponentially attenuated, sinusoidally modulated laser beam depositing heat in water. The present model incorporates the following features: The beam diverges, it is not everywhere narrow, and the decay of the beam is not exponential. Directivity of the generated sound is discussed and compared with the Westervelt-Larson results. [Work supported by the U.S. Naval Ocean Research and Development Activity.]
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