Torsional Oscillator Experiments with High Stability and Reproducibility

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We report experiments of the torsional oscillator to observe the superfluid transition in 4He films in porous glass (the pore diameter is 1μm). Stability and reproducibility of the oscillator, which quite often is problematic in previous experiments, is essential for a quantitative analysis of observations in different conditions. It follows that the friction of the superfluid films and the energy dissipation of the solid films are derived from comparisons of measurements for different film thickness.

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