Title :
A novel acoustic lens in superfluid 3He
Author :
Bullock, G.L. ; Shivaram, B.S.
Author_Institution :
Dept. of Phys., Virginia Univ., Charlottesville, VA, USA
Abstract :
The authors propose a novel scheme to achieve focusing of sound waves in superfluid 3He. This scheme exploits the magnetic field dependence of the superfluid phase diagram and the difference in the sound propagation characteristics of the A- and B-phases. Central to the scheme is the dispersion caused by the sound wave´s strong interaction with order-parameter collective modes that exist in the B-phase. Details of a magnet that will be used to achieve such a lens are presented
Keywords :
acoustic devices; magnetic lenses; superfluid helium-3; 3He superfluid; A-phase; B-phase; acoustic lens; characteristics; dispersion; magnet; magnetic field dependence; order-parameter collective modes; phase diagram; sound propagation; sound waves focusing; Acoustic beams; Acoustic propagation; Acoustic pulses; Attenuation; Frequency; Helium; Lenses; Magnetic fields; Magnetic liquids; Physics;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49549
