Dr. Viktor Tsepelin, Department of Physics, Lancaster University, UK
Probing superfluid 3He and 4He using mechanical oscillators
Time: Thu 2016-09-01 09.00 - 11.00
Location: FA31
Participating: Dr. Viktor Tsepelin
Title: Probing superfluid 3He and 4He using mechanical oscillators
Abstract: We study responses of various mechanical objects: grids, quartz tuning forks, and superconducting vibrating wires in superfluid 4He and 3He-B. While the flow of bulk superfluid must be irrotational, it can mimic classical turbulence by supporting singly quantised vortices. We will discuss force-velocity characteristics of mechanical oscillators in both fluids and will demonstrate how our devices could be used to produce and to investigate tangle of quantum vortices (quantum turbulence). Our studies reveal that despite the absence of frictional dissipation, quantum turbulence in the T = 0 limit behaves remarkably similarly to classical turbulence. We will present our latest results on visualization of quantum turbulence in superfluid 3He-B.