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首页> 外文期刊>Plasma physics and controlled fusion >Predictive analysis of q-profile influence on transport in JET and ASDEX Upgrade hybrid scenarios
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Predictive analysis of q-profile influence on transport in JET and ASDEX Upgrade hybrid scenarios

机译：在JET和ASDEX升级混合方案中q剖面对运输的影响的预测分析

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Hybrid scenarios in present machines are often characterized by improved confinement compared with the IPB98(y,2) empirical scaling law expectations. This work concentrates on isolating the impact of increased s/q at outer radii (where s is the magnetic shear) on core confinement in low-triangularity JET and ASDEX Upgrade (AUG) experiments. This is carried out by predictive heat and particle transport modelling using the integrated modelling code CRONOS coupled to the GLF23 turbulent transport model. For both machines, discharge pairs were analysed displaying similar pedestal confinement yet significant differences in core confinement. From these comparisons, it is found that s/q shaping at outer radii may be responsible for up to 50% of the relative core confinement improvement observed in these specific discharges. This relative improvement is independent of the degree of rotational shear turbulence suppression assumed in the GLF23 model. However, employing the full GLF23 rotational shear model leads to an overprediction of the ion temperatures in all discharges analysed. Additional mechanisms for core confinement improvement are discussed and estimated. Further linear threshold analysis with QuaLiKiz is carried out on both pairs of discharges. This work aims to validate recent predictions of the ITER hybrid scenario also employing CRONOS/GLF23, where a high level of confinement and resultant fusion power sensitivity to the s/q profile was found.
机译：与IPB98（y，2）经验缩放定律预期相比，当前机器中的混合方案通常具有改善的局限性。这项工作的重点是在低三角形JET和ASDEX升级（AUG）实验中，隔离增加的s / q在外半径（其中s是磁剪切）对铁心约束的影响。这是通过使用与GLF23湍流传输模型耦合的集成建模代码CRONOS通过预测的热量和粒子传输建模进行的。对于两台机器，分析了放电对，显示出相似的基座限制，但堆芯限制存在显着差异。从这些比较中可以发现，在这些特定的放电中，外半径处的s / q整形可能占相对芯约束改善的50％。这种相对的改进与GLF23模型中假定的旋转剪切湍流抑制程度无关。但是，采用完整的GLF23旋转剪切模型会导致对所有分析的放电中离子温度的过高预测。讨论和评估了其他用于改善核心禁闭的机制。使用QuaLiKiz对两对放电进行进一步的线性阈值分析。这项工作旨在验证也采用CRONOS / GLF23的ITER混合情景的最新预测，在该情景中，发现了对s / q谱图的高水平限制和所得融合功率敏感性。

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