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Improved H-mode access in connected DND in MAST

机译：MAST中已连接的DND中改进的H模式访问

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摘要

In the Mega-Amp Spherical Tokamak, MAST, the formation of the edge transport barrier leading to the high-confinement (H-mode) regime is greatly facilitated by operating in a double null diverted (DND) configuration where both X-points are practically on the same flux surface. Ohmic H-modes are presently only obtained in these connected double null diverted (CDND) configurations. The ease of H-mode access is lost if the two flux surfaces passing through the X-points are radially separated by more than one ion Larmor radius (rho(i) approximate to 6 mm) at the low-field-side mid-plane. The change of the magnetic configuration from disconnected to CDND is accompanied by a change in the radial electric field of about Delta E-psi approximate to - 1 kV m(-1) and a reduction of the electron temperature decay length in the high-field-side scrape-off-layer. Other parameters at the plasma edge, in particular those affecting the H-mode access criteria of common L/H transition theories, are not affected by the slight changes to the magnetic configuration. It is believed that the observed change in E-psi, which may result from differences in ion orbit losses, leads to a higher initial E x B flow shear in CDND configurations which could lead to the easier H-mode access.
机译：在MAST的Mega-Amp球形Tokamak中，通过在两个X点实际上都是双零点转向（DND）配置下运行，极大地促进了导致高约束（H-mode）机制的边缘传输屏障的形成。在同一通量表面上。目前仅在这些连接的双零位转向（CDND）配置中获得欧姆H模式。如果两个通过X点的通量表面在低场侧中平面径向分开一个以上的离子拉莫半径（rho（i）约为6 mm），则会失去H模式访问的便利性。磁性结构从断开到CDND的变化伴随着大约Delta E-psi大约-1 kV m（-1）的径向电场的变化以及高场中电子温度衰减长度的减小侧刮除层。等离子体边缘的其他参数，尤其是那些影响普通L / H跃迁理论的H模式访问标准的参数，不受磁配置的轻微变化的影响。据信，观察到的E-psi变化可能是由离子轨道损失的差异引起的，导致CDND配置中较高的初始E x B流动剪切，这可能导致更容易进行H模式访问。

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