ITER edge database investigations of the SOL width

JOURNAL OF NUCLEAR MATERIALS

卷:266

Article; Proceedings Paper

McCormick, K ; Asakura, N ; Bosch, S ; Davies, S ; Fielding, S ; Itami, K ; Kawashima, H ; LaBombard, B ; Lipschultz, B ; Loarte, A ; Monk, R ; Porter, G ; Schweinzer, J ; Shimada, M ; Sugihara, M

关键词: ITER;    scaling law;    SOL width;    tokamak;   

DOI  :  10.1016/S0022-3115(98)00521-2

来源: Elsevier

【 摘 要 】

Based on the ITER edge database, comparisons among the major tokamaks (ASDEX, ASDEX-Up, COMPASS-D, C-MOD, DIII-D, JET, JFT-2M and JT-60U) with respect to systematic SOL-width behavior are presented in terms of free-form regression analysis for lambda(ne) and lambda(Tc). Emphasis is placed on OH-L plasmas as this data is most abundant and coherent. Despite differences in size, wall-conditioning and divertor configuration, broadly similar trends are found in the regimes of low- and high-recycling and partially-detached divertor operation. In the low-recycling regime all machines appear to underlie a size scaling: lambda(ne) (min), lambda(Te) (min) similar to const.(surface area/I-p)(0.7). Operation at high q(95), high densities with respect to the Greenwald limit, or high powers leads to SOL widths considerably in excess of the values indicated by this simple scaling, and are documented in the form of machine-specific or machine-group-specific parametric expressions. For ELMy II-modes there is a general, but not universal, trend of smaller lambda(ne) and lambda(Tc) being associated with higher core confinement. On ASDEX-Up the SOL pressure e-folding length can vary as n(e) I-p(-2) for ELMy H-modes. (C) 1999 Elsevier Science B.V. All rights reserved.

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