Observation of wave energy accumulation in the turbulent spectrum of capillary waves on the He-II surface under harmonic pumping
L. V. Abdurakhimov, M. Yu. Brazhnikov, I. A. Remizov, A. A. Levchenko
Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia
Abstract
Recent results of the experimental study of capillary turbulence
on superfluid helium-4 surface are presented. For the first time wave energy
accumulation was observed in the wave turbulent spectrum at high frequencies
when the surface was excited by harmonic pumping. We suggest a qualitative
explanation of this phenomenon in the frames of weak wave turbulence approach
that takes into account discreteness of the eigenfrequencies spectrum of
surface oscillations in the cylindrical resonator.