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Article
High Q value Quartz Tuning Fork in Vacuum as a Potential Thermometer in Millikelvin Temperature Range
The results of a newly developed pulse-demodulation (P-D) technique introduced to determine the resonant characteristics of a high Q value quartz tuning forks in vacuum and millikelvin temperature range are prese...
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Article
Open AccessResponse of a Mechanical Oscillator in Solid 4He
We present the first measurements of the response of a mechanical oscillator in solid 4He. We use a lithium niobate tuning fork operating in its fundamental resonance mode at a frequency of around 30 kHz. Measure...
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Article
Vacuum Measurements of a Novel Micro-resonator Based on Tin Whiskers Performed at mK Temperatures
We present a method of preparation and preliminary vacuum measurements conducted at ∼20 mK of a new type of micro-resonator based on Sn-whiskers. Sn-whiskers have ∼1 μm radius and their length can be ∼1–2 mm. ...
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Article
Open AccessPlastic Properties of Solid 4He Probed by a Moving Wire: Viscoelastic and Stochastic Behavior Under High Stress
We present measurements of a thin wire moving through solid 4He. Measurements were made over a wide temperature range at pressures close to the melting curve. We describe the new experimental technique and presen...
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Article
Thermometry in Normal Liquid 3He Using a Quartz Tuning Fork Viscometer
We have developed the use of quartz tuning forks for thermometry in normal liquid 3He. We have used a standard 32 kHz tuning fork to measure the viscosity of liquid 3He over a wide temperature range, 6 mK<T<1.8 K...
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Article
Probing Andreev Reflection in Superfluid 3He-B Using a Quartz Tuning Fork
Direct measurements of the Andreev reflection of the quasiparticles excitations in superfluid 3He-B in the ballistic regime at 0.5 bar using a quartz tuning fork are presented. Based on these measurements, we wer...
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Article
Vibrating Quartz Fork—A Tool for Cryogenic Helium Research
Oscillating objects such as discs, piles of discs, spheres, grids and wires have been widely used in cryogenic fluid dynamics and in quantum fluids research since the discovery of superfluidity. A new additio...
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Article
Quantum Turbulence Generated and Detected by a Vibrating Quartz Fork
Flow due to a commercially available vibrating quartz fork is studied in gaseous helium, He I, He II and 3He–B, over a wide range of temperatures and pressures. On increasing the driving force, the flow changes ...
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Article
Quartz Tuning Fork: Thermometer, Pressure- and Viscometer for Helium Liquids
Commercial quartz oscillators of the tuning-fork type with a resonant frequency of ∼ 32 kHz have been investigated in helium liquids. The oscillators are found to have at best Q values in the range 105–106, when ...
