标题： 湍流驱动的德克萨斯螺旋装置粒子输运 显示英文标题

标题： Turbulence driven particle transport in Texas Helimak

摘要： 我们分析了德克萨斯螺旋磁约束装置（K. W. Gentle 和 Huang He，等离子体科学与技术，10，284 (2008)）中的湍流驱动粒子输运，这是一个具有磁曲率和剪切的一维平衡的环形等离子体装置。通过外部电压偏置改变径向电场，会改变光谱等离子体特性，导致负偏置值时出现主导频率，而正偏置值时出现宽带频率谱。对于负偏置等离子体放电，当波以接近等离子体流动速度的相速度传播时，输运较高，这表明输运强烈受到波-粒子共振相互作用的影响。另一方面，对于正偏置，等离子体具有反转剪切流动，并且我们观察到在无剪切的径向区域输运几乎为零，这表明该区域存在输运屏障。 显示英文摘要

摘要： We analyze the turbulence driven particle transport in Texas Helimak (K. W. Gentle and Huang He, Plasma Sci. and Technology, 10, 284 (2008)), a toroidal plasma device with one-dimensional equilibrium with magnetic curvature and shear. Alterations on the radial electric field, through an external voltage bias, change spectral plasma characteristics inducing a dominant frequency for negative bias values and a broad band frequency spectrum for positive bias values. For negative biased plasma discharges, the transport is high where the waves propagate with phase velocities near the plasma flow velocity, an indication that the transport is strongly affected by a wave particle resonant interaction. On the other hand, for positive bias the plasma has a reversed shear flow and we observe that the transport is almost zero in the shearless radial region, an evidence of a transport barrier in this region.