Similarity experiments were performed on the DIII-D and TCV tokamaks to explore the scaling of energy confinement in negative triangularity (NT) plasmas using non-dimensional variables. Near up-down symmetric plasmas with large top-bottom averaged NT were created in a lower single null configuration, with the shape of the separatrix being closely matched between the two devices. The normalized energy confinement is found to weakly improve at increasing collisionality and, between the two devices, shows a machine size scaling behavior between Bohm and gyro-Bohm. Engineering scaling on a large DIII-D dataset is in agreement with the non-dimensional experiment.
相似性实验在DIII-D和TCV托卡马克装置上进行，旨在利用无量纲变量探索负三角形成形（NT）等离子体中能量约束的标度关系。在下单零位形中构建了接近上下对称、且顶部与底部平均负三角形成形较大的等离子体，两个装置之间的分界面形状被紧密匹配。归一化能量约束被发现随碰撞率的增加而略有改善，并且在两个装置之间，其机器尺寸标度行为介于玻姆标度和回旋玻姆标度之间。基于DIII-D大型数据集的工程标度与无量纲实验结果一致。