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The influence of gas fuelling location on H-mode access in the MAST spherical tokamak

机译:气体加注位置对MAST球形托卡马克中H模式进入的影响

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摘要

The observation that high-field side (HFS) gas puff refuelling facilitates access to the improved confinement (H-mode) regime on the COMPASS-D and MAST tokamaks prompted a theoretical investigation of the role of the neutral gas dynamics in controlling the edge plasma rotation and radial E-field, E-r. Within the framework of neo-classical theory, higher edge plasma flow, and hence E-r, are predicted when fuelling from the HFS-rather than from the more usual low-field side (LFS)-provided neutral viscosity dominates the transport of toroidal angular momentum. Here, these predictions are compared with experiments on MAST, where the influence of the gas-puff location on the edge E-r profile is measured spectroscopically. An increase in E-r is indeed observed with HFS refuelling in the region where the edge transport barrier forms, provided the neutral density at the LFS is sufficiently low so as not to damp the toroidal flow.
机译:关于高场侧(HFS)气嘴加油促进进入COMPASS-D和MAST托卡马克的改进禁闭(H-mode)方案的观察结果,对中性气体动力学在控制边缘等离子体中的作用进行了理论研究旋转和径向电场,Er。在新古典理论的框架内,当从HFS而不是从更通常的低场侧(LFS)提供的中性粘度进行燃料加注时,可以预测到更高的边缘等离子体流量,因此也可以预测Er 。在这里,将这些预测与MAST上的实验进行比较,在MAST上,用光谱法测量气孔位置对边缘E-r轮廓的影响。实际上,只要在LFS形成边缘传输屏障的区域加油,就可以观察到E-r的增加,前提是LFS处的中性密度足够低,以至于不会减弱环流。

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