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Plasma current dependence of the edge pedestal height in JET ELM-free H-modes

机译：无JET ELM H模式下边缘基座高度的等离子体电流依赖性

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Some models for the suppression of turbulence in the L to H transition, suggest that the width of the ii-mode edge barrier is either proportional or is of the order of the thermal or the fast-ion poloidal Larmor radius. This would require that the width of the edge barrier should depend on the plasma current. This dependence has been clearly verified at JET in experiments designed to control the edge MHD stability of ELM-free hot-ion H-mode plasmas. The effects of isotopic mass and the applicability of several edge barrier models to the hot-ion H-mode plasmas were analysed in (Guo H Y et al 2000 Edge transport barrier in JET hot-ion H-modes Nucl. Fusion 40 69) using a large database containing both deuterium-only and deuterium-tritium plasmas. This database has now been enlarged to include discharges from a plasma shape scan, allowing one to study the dependence of the pedestal height on the edge shear. In addition, the range of plasma currents was extended up to 6 MA. It is shown that the edge data are best described by a model where the edge barrier width is determined by the fast ions weighted towards the components with largest poloidal Larmor radii. However, it is not possible to conclusively eliminate the thermal ion model. [References: 15]
机译：一些在L到H过渡中抑制湍流的模型表明ii型边缘障碍的宽度成正比，或者是热离子或快离子倍体拉莫尔半径的量级。这将要求边缘势垒的宽度应取决于等离子体电流。这种依赖性已在JET上进行了旨在控制无ELM热离子H模式等离子体的边缘MHD稳定性的实验中的明确验证。同位素质量的影响以及几种边缘障壁模型对热离子H型等离子体的适用性在（Guo HY等人，2000年JET热离子H型Nucl。Fusion 40 69中的边缘迁移势垒）中进行了分析。包含仅氘和氘-血浆的大型数据库。该数据库现已扩大到包括等离子形状扫描的放电，使人们能够研究基座高度对边缘剪切的依赖性。此外，等离子电流的范围扩展到了6 MA。结果表明，边缘数据最好用一个模型来描述，其中边缘势垒宽度由快速离子确定，该快速离子的加权方向是最大拉莫尔半径的组分。但是，不可能最终消除热离子模型。 [参考：15]

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