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Experiments were performed at a proton accelerator and an infrared laseracility to investigate the sound generation caused by the energy deposition ofpulsed particle and laser beams in water. The beams with an energy range of 1PeV to 400 PeV per proton beam spill and up to 10 EeV for the laser pulse weredumped into a water volume and the resulting acoustic signals were recordedwith pressure sensitive sensors. Measurements were performed at varying pulseenergies, sensor positions, beam diameters and temperatures. The data is welldescribed by simulations based on the thermo-acoustic model. This implies thatthe primary mechanism for sound generation by the energy deposition ofparticles propagating in water is the local heating of the media giving rise toan expansion or contraction of the medium resulting in a pressure pulse withbipolar shape. A possible application of this effect would be the acousticaldetection of neutrinos with energies greater than 1 EeV.Comment: 5 pages, 2 figures, to appear in the proceedings of the 1st  International ARENA Workshop, May 17-19th, 2005, DESY Zeuthe

TESTING THERMO-ACOUSTIC SOUND GENERATION IN WATER WITH PROTON AND LASER BEAMS