Charged Tangles of Quantized Vortices in Superfluid 4He
Charged Tangles of Quantized Vortices in Superfluid 4He
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DOI：
10.1007/s10909-010-0241-0
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发表时间：
2010-12-01
影响因子：
2
通讯作者：
Tompsett, P. A.
中科院分区：
文献类型：
--
作者：
Golov, A. I.;Walmsley, P. M.;Tompsett, P. A.
我们表明，湍流在超流He-4在低温下可以产生和探测被困在涡核上的注入离子。我们最近的实验结果，其中负离子注入在短期和长期，在不同的数量，并到不同的外加电场，概述。三个非常不同的机制，旋涡辅助运输的被困离子观察：一个是孤立的涡环，而其他两个与缠结的涡线。似乎有两种不同类型的涡旋缠结，其特征在于通过它们的离子运动的速度：在低耗散状态下的漂移极化缠结，主要是平流捕获的离子，以及在高耗散状态下的更各向同性的缠结，通过施加电场中的离子电流的连续强迫来维持，捕获的离子快速移动。
We show that turbulence in superfluid He-4 at low temperatures can be generated and probed by injected ions trapped on vortex cores. The results of our recent experiments, in which negative ions were injected during short and long periods, in different quantities, and into different applied electric fields, are outlined. Three very different mechanisms of vortex-assisted transport of trapped ions were observed: one is on isolated vortex rings while two others are associated with tangles of vortex lines. It seems there are two different types of vortex tangles that can be characterized by the velocity of ion motion through them: a drifting polarized tangle in a low-dissipation state that mainly advects trapped ions, and a more isotropic tangle in a highly-dissipative state, sustained by a continuous forcing by the ion current in an applied electric field, through which trapped ions move rapidly.