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SUMMARY:Visualizing Quantum Turbulence in Superfluid 3 He-B using quasipar
 ticles - Viktor Tseplin (Lancaster University)
DTSTART:20151109T153000Z
DTEND:20151109T170000Z
UID:TALK60778@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:We present studies of quantum turbulence in superfluid 3He-B i
 n zero temperature limit. While the flow of bulk superfluid must be irrota
 tional it can mimic classical turbulence by supporting singly quantised vo
 rtices. We use a two-dimensional quasiparticle detector to observe quantum
  turbulence in superfluid 3He-B at ultra-low temperatures. The detector co
 nsists of 25 pixels each containing a miniature quartz tuning fork. The da
 mping on each fork provides a measure of the local quasiparticle flux. The
  detector is illuminated by a beam of ballistic quasiparticles generated f
 rom a near-by black-body radiator. Vortices have a large cross-section for
  Andreev reflecting ballistic quasiparticles at low temperatures. We gener
 ate a tangle of vortices (quantum turbulence) in the path of the beam usin
 g a vibrating wire resonator. The vortices cast shadows onto the face of t
 he detector due to the Andreev reflection. This allows us to image the vor
 tex tangle and to investigate the tangle dynamics. Single vortex resolutio
 n is attainable. We present some initial measurements and compare with sim
 ulations.  
LOCATION:Rutherford building\, Seminar Room B
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