For the first time, a detailed space-time dependence of acoustic pressure produced by a 50-MeV electron beam in water are obtained at the electron accelerator of Moscow State University. Measurements are performed at 100 points taken along one line parallel to the beam axis and spaced 6.5 cm apart from this axis. The 2D (time-distance) patterns display two paths corresponding to signals from two sound sources: a cylindrical acoustic antenna produced by the electron beam and the entrance cap separating the water and air media.
$^1$All-Russia Research Institute of Physicotechnical and Radio Engineering Measurements (State Scientific Center), Mendeleevo, Moscow oblast, 141570, Russia
$^2$Institute for Theoretical and Experimental Physics (State Scientific Center), Moscow, 117218, Russia
$^3$ Institute of Nuclear Physics, Moscow State University, Leninskie gory, Moscow, 119992, Russia
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