| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2015: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
|
|---|
| Outline of Final Research Achievements |
We report the results obtained in the present study as follows, for the purpose of investigating vortex motions experimentally in superfluid helium by using novel characteristics of a quantized vortex. Using a set of two vibrating wires as a vortex generator and a detector of a vortex ring, we measured the time between the beginning of a vortex creation by the generator and the detection of a vortex by the detector. We find that vortices created by the generator emit vortex rings randomly, becoming an equilibrium state between the creation and the emission of vortices. The diameters of the emitted rings distribute widely, suggesting that vortices created by the generator become entangled, namely quantum turbulence. The relation between the ring diameter and the mean emission rate implies that the vortex structure of a quantum turbulence created by the generator has a self-similarity.
|
