First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER

A. Pau; JET contributors; M. Giacomin; O. Sauter; P. Ricci; T. Eich (the ASDEX Upgrade team; the TCV team)

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First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER

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arxiv 2204.02911 v1 pith:LAVBSMYM submitted 2022-04-06 physics.plasm-ph

First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER

M. Giacomin , A. Pau , P. Ricci , O. Sauter , T. Eich (the ASDEX Upgrade team , JET Contributors , the TCV team) This is my paper

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keywords scalingdensitytokamakstransportturbulentfirst-principlesgreenwalditer

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A first-principles scaling law, based on turbulent transport considerations, and a multi-machine database of density limit discharges from the ASDEX Upgrade, JET and TCV tokamaks, show that the increase of the boundary turbulent transport with the plasma collisionality sets the maximum density achievable in tokamaks. This scaling law shows a strong dependence on the heating power, therefore predicting for ITER a significantly larger safety margin than the Greenwald empirical scaling (Greenwald et al, Nucl. Fusion, 28(12), 1988) in case of unintentional H-L transition.

First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER

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