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Multi-device studies of pedestal physics and confinement in the I-mode regime

机译:基于I-模式的基座物理和限制的多器件研究

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摘要

This paper describes joint ITPA studies of the I-mode regime, which features an edge thermal barrier together with L-mode-like particle and impurity transport and no edge localized modes (ELMs). The regime has been demonstrated on the Alcator C-Mod, ASDEX Upgrade and DIII-D tokamaks, over a wide range of device parameters and pedestal conditions. Dimensionless parameters at the pedestal show overlap across devices and extend to low collisionality. When they are matched, pedestal temperature profiles are also similar. Pedestals are stable to peeling–ballooning modes, consistent with lack of ELMs. Access to I-mode is independent of heating method (neutral beam injection, ion cyclotron and/or electron cyclotron resonance heating). Normalized energy confinement H 98,y2  ≥  1 has been achieved for a range of 3  ≤  q 95  ≤  4.9 and scales favourably with power. Changes in turbulence in the pedestal region accompany the transition from L-mode to I-mode. The L–I threshold increases with plasma density and current, and with device size, but has a weak dependence on toroidal magnetic field B T. The upper limit of power for I-modes, which is set by I–H transitions, increases with B T and the power range is largest on Alcator C-Mod at B  >  5 T. Issues for extrapolation to ITER and other future fusion devices are discussed.
机译:本文介绍了ITPA对I型态的联合研究,该研究具有边缘热障以及L型样颗粒和杂质传输以及无边缘局部化模式(ELM)的特点。在各种设备参数和基座条件下,Alcator C-Mod,ASDEX升级和DIII-D托卡马克已经证明了该方案。基座上的无量纲参数显示设备间重叠,并扩展到低碰撞性。当它们匹配时,基座温度曲线也相似。基座对脱皮-膨胀模式很稳定,这与缺少ELM保持一致。进入I模式与加热方法(中性束注入,离子回旋加速器和/或电子回旋加速器共振加热)无关。在3energy≤q 95≤4.9的范围内已实现归一化能量限制H 98,y2≥1,并且随功率成比例地缩放。从L模式到I模式的过渡伴随着基座区域湍流的变化。 L–I阈值随等离子体密度和电流以及器件尺寸的增加而增加,但对环形磁场B T的依赖性较弱。I模式的功率上限由I–H跃迁设置,随BT和功率范围在B> 5 T的Alcator C-Mod上最大。讨论了外推到ITER和其他未来聚变设备的问题。

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