Superfluid He in Rotation: Single-Vortex Resolution and Requirements on Rotation
Superfluid He in Rotation: Single-Vortex Resolution and Requirements on Rotation
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旋转中的超流He：单涡分辨率和旋转要求
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Krusius
中科院分区：
文献类型：
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作者：
R. Blaauwgeers;S. Boldarev;V. Eltsov;A. Finne;M. Krusius
目前用于研究氦超流体中量子化涡度的旋转制冷机通常能够冷却到mK温度，旋转速度可达1转/秒。为了在所有旋转速度下实现单涡分辨率，需要平滑稳定的旋转。这需要低而稳定的旋转摩擦，足够的轴向对齐和横向平衡的重量，以促进机械稳定性和无进动旋转。我们评论了一般的设计原则，讨论了我们装置的旋转噪声频谱，并描述了低噪声测量中来自旋转的干扰问题。
The present generation of rotating refrigerators, which are used for the study of quantized vorticity in helium superfluids, are often capable of cooling to mK temperatures and rotate up to ∼ 1 rev/s. To achieve single-vortex resolution at all rotation velocities, smooth and stable rotation is required. This calls for low and stable rotational friction, sufficient axial alignment and lateral balancing of weights, to promote mechanical stability and precession-free rotation. We comment on general design principles, discuss the rotation noise spectrum of our installation, and describe interference problems from the rotation in low-noise measurement.