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Scaling of the pedestal density in type-I ELMy H-mode discharges and the impact of upper and lower triangularity in JET and ASDEX upgrade

机译:I型ELMy H型放电中基座密度的缩放比例以及JET和ASDEX升级中上下三角形的影响

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摘要

Experiments have been performed to disentangle the individual role of tipper and lower triangularity on density buildup of lower single null, type-I ELMy H-mode discharges in JET. Comparison with corresponding data from ASDEX Upgrade allowed us to determine a dimensionless representation of the relation between the main chamber recycling and core density and to widen the triangularity variation in the data base. To incorporate the recycling flux density F in a dimensionless form, an effective scrape-off layer density n(e,SOL) proportional to Gamma(0.5) is introduced allowing us to,,SOL parametrize and scale the core density by the density rise factor (n) over bar (e)/n(e,SOL). The scaling uses edge-specific definitions of normalized Larmor radius, collisionality and beta. Rewritten in dimensional form, a behaviour is found which is very similar to energy confinement scalings for the ELM-averaged conditions considered here: the density rise factor exhibits an almost linear dependence on plasma current, a weak negative toroidal field dependence as well as power degradation. While a pronounced positive dependence of density buildup on the upper triangularity is observed, no significant correlation with the lower triangularity is found. In particular the dependences on plasma current and upper triangularity emphasize the importance of transport physics for the density buildup.
机译:已经进行了实验,以弄清自卸车和较低的三角形性对JET中较低的单个零,I型ELMy H型放电的密度累积的作用。通过与ASDEX升级版的相应数据进行比较,我们可以确定主腔室回收率与堆芯密度之间关系的无量纲表示,并扩大了数据库中的三角形变化。为了以无量纲形式合并回收磁通密度F,引入了与Gamma(0.5)成比例的有效刮除层密度n(e,SOL),从而允许我们对SOL进行参数化并通过密度上升因子缩放磁芯密度(n)超过(e)/ n(e,SOL)。缩放使用归一化的拉莫尔半径,碰撞性和beta的边缘特定定义。以尺寸形式重写,发现的行为与此处考虑的ELM平均条件的能量限制比例非常相似:密度上升因子对等离子体电流表现出几乎线性的依赖性,对环形磁场的依赖性较弱,并且功率下降。尽管观察到密度累积对上三角的明显正相关性,但未发现与下三角的显着相关性。特别是对等离子体电流和上三角关系的依赖强调了传输物理学对密度积累的重要性。

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