Spectral properties of Andreev reflection from quantum turbulence in 3He-B. What do they tell about turbulent fluctuations? etc15 Tracking Number 21Presentation: Session: Superfluids 1 Room: Room E Session start: 10:30 Wed 26 Aug 2015 Yuri A. Sergeev yuri.sergeev@ncl.ac.uk Affifliation: Joint Quantum Centre Durham-Newcastle and School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom Carlo F. Barenghi c.f.barenghi@ncl.ac.uk Affifliation: Joint Quantum Centre Durham-Newcastle and School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom Viktor Tsepelin v.tsepelin@lancaster.ac.uk Affifliation: Department of Physics, Lancaster University, Lancaster, United Kingdom Andrew W. Baggaley Andrew.Baggaley@glasgow.ac.uk Affifliation: Joint Quantum Centre Durham-Newcastle and School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom Shaun N. Fisher s.fisher@lancaster.ac.uk Affifliation: Department of Physics, Lancaster University, Lancaster, United Kingdom George R. Pickett g.pickett@lancaster.ac.uk Affifliation: Department of Physics, Lancaster University, Lancaster, United Kingdom Topics: - Turbulence in superfluids Abstract: One of the experimental techniques developed to measure quantum turbulence at low temperatures in 3He-B utilizes the Andreev reflection of thermal quasiparticle excitations from quantized vortices and vortex structures. We present the results of theoretical, numerical, and experimental study of Andreev scattering from quantum turbulence in 3He-B. We analyze the spectral properties of the Andreev reflection and compare these with the spectral properties of superfluid turbulence, and discuss the physical mechanisms responsible for the scaling of spectral densities. Finally, we discuss the relation between our findings and related observables in ordinary turbulence. |