螺旋MRI实验PROMISE中边界效应的减小
Reduction of boundary effects in spiral MRI experiment PROMISE
摘要：
磁旋转不稳定性（MRI）是天体物理学中最重要和最常见的不稳定性之一，它被广泛认为是宇宙中能量效率最高的天体--吸积盘中湍流粘性的来源。然而，很难将这一过程带到地球上，并在实验室实验中模拟它。已经提出了几种不同的方法，最近的一种是PROMISE（波茨坦-罗森多夫磁旋转不稳定性实验）。它是在无电流螺旋磁场作用下，两个旋转圆柱体之间的液态金属流动。圆柱体必须用板覆盖，这会引入额外的端部效应，从而改变流动，并使MRI稳定和不稳定状态之间的清晰区分变得更加困难。在本文中，我们提出了简单而廉价的改进PROMISE实验，这将减少这些不良影响。
英文摘要：
Magnetorotational instability (MRI) is one of the most important and most common instabilities in astrophysics, it is widely accepted that it serves as a source of turbulent viscosity in accretion disks -- the most energy efficient objects in the Universe. However it is very difficult to bring this process down on earth and model it in a laboratory experiment. Several different approaches have been proposed, one of the most recent is PROMISE (Potsdam-ROssendorf Magnetorotational InStability Experiment). It consists of a flow of a liquid metal between two rotating cylinders under applied current-free spiral magnetic field. The cylinders must be covered with plates which introduce additional end-effects which alter the flow and make it more difficult to clearly distinguish between MRI stable and unstable state. In this paper we propose simple and inexpensive improvement to the PROMISE experiment which would reduce those undesirable effects.
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