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The role of aspect ratio and beta in H-mode confinement scalings

机译:长宽比和beta在H模式限制缩放中的作用

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The addition of high power, low aspect ratio data from the NSTX and MAST experiments has motivated a new investigation of the effect of aspect ratio on confinement scaling. Various statistical methods, including those that incorporate estimates of measurement error, have been applied to datasets constrained by the standard set of criteria in addition to the range of kappa and M-eff appropriate to ITER operation. Development of scalings using engineering parameters as predictor variables results in epsilon-scaling coefficients that range from 0.38 to 1.29; the transformation of these scalings to physics variables results in an unfavourable dependence of beta tau on beta, but a favourable dependence on epsilon. Because the low aspect ratio devices operate at low B-T and therefore high beta(T), a strong correlation exists between epsilon and beta, and this makes scalings based on physics variables imprecise.
机译:来自NSTX和MAST实验的高功率,低长宽比数据的添加激发了对长宽比对约束缩放的影响的新研究。除了适用于ITER操作的kappa和M-eff的范围外,各种统计方法,包括那些结合了测量误差估计的统计方法,都已应用于受标准标准集约束的数据集。使用工程参数作为预测变量进行标度开发会导致ε标度系数从0.38到1.29;将这些标度转换为物理变量会导致βtau对β的不利依赖性,但对epsilon的有利依赖性。由于低纵横比的设备在低B-T下运行,因此在高beta(T)下运行,因此ε与beta之间存在很强的相关性,这使得基于物理变量的缩放不精确。

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