Turbulence of Second Sound Waves in Superfluid 4He: Effect of Low-Frequency Resonant Perturbations |
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| Authors: | P. V. E. McClintock V. B. Efimov A. N. Ganshin G. V. Kolmakov L. P. Mezhov-Deglin |
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| Affiliation: | (1) Department of Physics, Lancaster University, LA1 4YB Lancaster, UK;(2) Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia |
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| Abstract: | We report the results of investigations of acoustic turbulence in a system of nonlinear second sound waves in a high-quality resonator filled with superfluid 4He. It was observed that subharmonics of a periodic driving force applied to the system may be generated via a parametric instability. We find that application of an additional low-frequency pumping to the turbulent system results in the generation of waves at combination frequencies of the driving forces and also leads to substantial changes in the energy spectrum of the acoustic oscillations. |
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| Keywords: | Wave turbulence Superfluid 4He Second sound Energy cascade |
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