Josephson Acoustic Radiation in Superfluid Helium.
CALIFORNIA UNIV BERKELEY DEPT OF PHYSICS
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The project to observe and measure Josephson acoustic radiation has begun. The most significant accomplishments in these first months are the following A prototype cell has been designed and constructed. Various aspects of the cell have been tested. The apparatus have been designed in a modular form so that individual components can be optimized separately. We have developed a displacement liquid Helium pump to force superfluid through a submicron apertures for times on the order of 100 seconds. The pump consists of a flexible plastic membrane which is metal coated on one side. Application of a voltage between the membrane and a nearby fixed electrode forces the membrane to move, thus pushing superfluid through the aperture.
- Inorganic Chemistry
- Electrical and Electronic Equipment
- Fluid Mechanics