Accession Number:

AD0745316

Title:

Investigation of Persistent Current States in Rotating Superfluid Helium Contained in Superleak Using Doppler-Shifted Fourth Sound.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s):

• Kojima,Haruo

Report Date:

1972-06-01

Pagination or Media Count:

172.0

Abstract:

Fourth sound techniques were extensively developed into a powerful tool for investigating persistent current states in rotating superfluid helium contained in a superleak. Unique features of these techniques are 1 persistent superfluid component velocity is directly determined by the Doppler-shifted splitting of a fourth sound resonant mode in an annular cavity 2 the superfluid component density is determined simultaneously and independently by measuring the velocity of fourth sound 3 persistent current states are observed from a rotating frame. The fourth sound techniques allows observations of persistent current states which are otherwise inaccessible in a stationary measurement. As a consequence the authors show that every phenomenon observed in rotating locked superfluid helium Bose superfluid has an analogous counterpart in an irreversible type-II superconductor Fermi superfluid. Author

Descriptors:

• (*SUPERFLUIDITY
• TRANSPORT PROPERTIES)
• LIQUEFIED GASES
• SUPERCONDUCTIVITY
• VISCOSITY
• VORTICES
• TEST METHODS
• CORRELATION TECHNIQUES
• HELIUM
• BOSONS
• FERMIONS
• THESES

Subject Categories:

• Physical Chemistry
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE