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[PDF] Top 20 Optomechanics with Superfluid Helium 4

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Optomechanics with Superfluid Helium 4

Optomechanics with Superfluid Helium 4

... In the first design, assuming the indium seals did not add height to the valve, the needle traveled about 0.050” to make contact with the seal. Given the bellows spring rate of 40.33 lb/in., this distance required about ... See full document

231

Transition from Ekman flow to Taylor vortex flow in superfluid helium

Transition from Ekman flow to Taylor vortex flow in superfluid helium

... In figure 4 we investigate the transition from Ekman flow to Taylor vortex flow at T = 2.17 K and h = 6. At low Reynolds numbers (Re = 100) the normal fluid consists of a pair of classically rotating Ekman cells. The ... See full document

13

Interactions between normal-fluid and superfluid vortex rings in helium-4

Interactions between normal-fluid and superfluid vortex rings in helium-4

... and superfluid vortex rings in helium-4 is ...induced superfluid vorticity is not trapped by the cores of the normal-fluid vortices, and, consequently, there is no strong correlation between ... See full document

6

Modeling Kelvin wave cascades in superfluid helium

Modeling Kelvin wave cascades in superfluid helium

... In recent years, the single vortex Kelvin wave cascade has attracted much theoretical [4, 5], numerical [6, 7, 8] and experimental [10] attention. Even within the classical one-dimensional vortex model, different ... See full document

19

Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4

Mutual-friction induced instability of normal-fluid vortex tubes in superfluid helium-4

... describes helium-4 becomes Bose-Einstein condensed, giving rise to a non-zero ground state that cor- responds to an inviscid fluid ...The superfluid coexists with the (classical-like) “normal-fluid” ... See full document

14

Quasiparticle beam profile measurements in superfluid helium 3   B

Quasiparticle beam profile measurements in superfluid helium 3 B

... to helium being inert and light it has a large range of uses. Helium is commonly used for party and weather ...liquid helium range from Magnetic Resonance Imaging scanners to CERNS Large Hadron ... See full document

120

The Study of Optoacoustic First and Second Sound Waves in Superfluid Helium under the Effect of Gaussian Laser Light Considering Electrostriction Mechanism

The Study of Optoacoustic First and Second Sound Waves in Superfluid Helium under the Effect of Gaussian Laser Light Considering Electrostriction Mechanism

... liquid helium-4 at far higher temperatures than it does in ...of helium-4 is a boson particle, by virtue of its zero spin. Helium-3, however, is a fermion particle, which can form ... See full document

8

Creation of quantized vortices at the lambda transition in liquid Helium 4

Creation of quantized vortices at the lambda transition in liquid Helium 4

... Some typical second sound signals, recorded shortly after an expansion, are shown in the inset to Fig 3. Although the signals at the shortest times (lower signal in each inset) are rather noisy, owing to mechanical ... See full document

9

Turbulence of Second Sound Waves in Superfluid 4He: Effect of Low Frequency Resonant Perturbations

Turbulence of Second Sound Waves in Superfluid 4He: Effect of Low Frequency Resonant Perturbations

... with superfluid helium that acoustic waves with fre- quency lower than the driving frequency may be generated due to nonlinearity: a sound wave with frequency equal to half the driving frequency ... See full document

9

Vortex nucleation in superfluid He 4

Vortex nucleation in superfluid He 4

... It is both an honour and a particular pleasure to have been invited to speak at the meeting celebrating the scientific career and achievements of Joe (W F) Vinen. His name has been familiar to me since my undergraduate ... See full document

15

Generation of defects in superfluid He 4 as an analogue of the formation of cosmic strings

Generation of defects in superfluid He 4 as an analogue of the formation of cosmic strings

... liquid helium rapidly through the lambda transition but, as Zurek pointed out, the liquid can instead be expanded through the transition at a speed limited, ultimately, by the velocity of first sound ...and ... See full document

9

Energy spectra of finite temperature superfluid helium-4 turbulence

Energy spectra of finite temperature superfluid helium-4 turbulence

... The results reveal the spectral structure of turbulence in the two fluids. Some of the resulting scaling laws do not have the desirable, large extension in wavenumber range because, due to computational complexity, it is ... See full document

15

Decay of finite temperature superfluid helium-4 turbulence

Decay of finite temperature superfluid helium-4 turbulence

... level, that is sustained via energy input from the superfluid. The latter is necessarily the case, since if the transfer of energy had the inverse direction, there would have been two energy sinks in the ... See full document

13

Superfluid helium-4 hydrodynamics with discrete topological defects

Superfluid helium-4 hydrodynamics with discrete topological defects

... formed superfluid structures do not mimic the morphology of the normal-fluid structures, and perform very different ...and superfluid vortex circulations (that cause the vortices to move with very different ... See full document

20

Superconductivity and Superfluidity   Part III: Superfluidity as a Consequence of Ordering of Zero point Oscillations

Superconductivity and Superfluidity Part III: Superfluidity as a Consequence of Ordering of Zero point Oscillations

... liquid helium-4 are electrically neutral, as they have no dipole moments and do not form ...liquid helium (as well as in other condensed substance where phase transfor- mations are related to the ... See full document

6

Dissipation in the superfluid helium film

Dissipation in the superfluid helium film

... bulk superfluid helium, using a "superfluid ...The superfluid continued to rotate, and its angular momentum and superfluid density could be ...average superfluid velocity and ... See full document

194

Hybrid atom-membrane optomechanics

Hybrid atom-membrane optomechanics

... The techniques to prepare, manipulate, and readout the motional and internal states of ultracold atoms on the quantum level are well-established. Combined with long ground state coherence times, this makes ultracold ... See full document

11

Testing Alternative Theories of Quantum Mechanics with Optomechanics, and Effective Modes for Gaussian Linear Optomechanics

Testing Alternative Theories of Quantum Mechanics with Optomechanics, and Effective Modes for Gaussian Linear Optomechanics

... of optomechanics has improved substantially [11, 21, ...Concurrently, optomechanics technology has seen many ...20]. Optomechanics has also been used to generate squeezed light [31, 34, ...driving ... See full document

249

Influence of Surface Structure on Hydrophobicity of Electrospun Nylon 6 Coated Fabric and Improvement of Durability using Atmospheric Pressure Plasma.

Influence of Surface Structure on Hydrophobicity of Electrospun Nylon 6 Coated Fabric and Improvement of Durability using Atmospheric Pressure Plasma.

... Figure 4-1: Martindale abrasion testing apparatus located in NCSU COT, showing mounted samples which oscillate against standard worsted wool fabric ...Figure 4-2: Sample preparation of electrospun webs for ... See full document

138

Cavity Optomechanics at Millikelvin Temperatures

Cavity Optomechanics at Millikelvin Temperatures

... cavity optomechanics, which concerns the coupling of a mechanical object’s motion to the electromagnetic field of a high finesse cavity, allows for exquisitely sensitive measurements of mechanical motion, from ... See full document

148

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