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JET divertor geometry and plasma shape effects on the L-H transition threshold

机译：JET偏滤器的几何形状和等离子体形状对L-H跃迁阈值的影响

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Results from recent experiments to study the effects of divertor geometry and increased plasma shaping on the L-H transition threshold on JET are reported. Equivalent septum configurations run with the new septum replacement plate (SRP) in the MkII Gas Box divertor have shown that the presence of the septum lowers the L-H transition power threshold, P-th, by 20%. For X-point to virtual septum top distances of less than 6 cm, the SRP plasmas also demonstrate a significant decrease of the L-H Pth and pedestal electron temperature, T-e with reduced X-point height. Although, the SRP plasma's Pth remains above that with the septum, there is no difference in the pedestal T, at the L-H transition. The influence of plasma shaping on the L-H transition has also been investigated for the first time on JET in a series of density scans at I-p/B-t of 2.5 MA/2.7 T. While keeping the lower triangularity, delta(lower), and divertor geometry constant, the upper triangularity, delta(upper), has been increased from 0.23 to 0.34 with no effect on Pth or the pedestal T-e or T-i. In a separate edge n(e) scan, two configurations with different delta(upper)/delta(lower) values of 0.23/0.23 and 0.43/0.33 have been compared. A large difference in the transition threshold is observed at values of edge n(e) above 1.8 x 10(19) m(-3), with the higher delta plasmas characterized by P-th of up to 25% lower at the highest densities scanned. This is thought to be the result of lowered X-point and outer strike point heights with increased delta.
机译：据报道，最近的实验结果表明，偏滤器的几何形状和增加的等离子体成形对JET的L-H跃迁阈值有影响。在MkII Gas Box偏滤器中使用新的隔垫更换板（SRP）运行的等效隔垫配置表明，隔垫的存在将L-H过渡功率阈值Pth降低了20％。对于小于6 cm的X点到虚拟隔垫顶部距离，SRP等离子体还显示L-H Pth和基座电子温度T-e显着降低，同时X点高度减小。尽管SRP血浆的Pth仍高于隔膜的Pth，但在L-H过渡时，基座T上没有差异。在Ip / Bt为2.5 MA / 2.7 T的一系列密度扫描中，还首次研究了等离子体整形对LH过渡的影响，对JET进行了研究。同时保持了较低的三角形性，δ（lower）和偏滤器几何形状常数三角形的上三角（delta（upper））已从0.23增加到0.34，而对Pth或基座Te或Ti没有影响。在单独的边缘n（e）扫描中，已比较了两种不同的delta（上）/ delta（下）值分别为0.23 / 0.23和0.43 / 0.33的配置。在大于1.8 x 10（19）m（-3）的边n（e）的值处观察到跃迁阈值存在较大差异，在最高密度下，较高的δ等离子体的特征是Pth降低了25％扫描。认为这是X点和外部打击点高度降低且增量增加的结果。

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