Low-recycling conditions and improved core confinement in steady-state operation scenarios in JET (Joint European Torus)

R. Cesario, L. Amicucci, A. Fonseca, I.T. Chapman, F. Jenko, M. Marinucci, S. Saarelma, P. Smeulders, D. Told, R. Zagorski, Y. Baranov, M. Beurskens, R. De Angelis, D. Mc Donald, C. Challis, A. Galli, J. Mailloux, V. Pericoli, M. Zerbini

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Abstract

In this paper, we discuss the phenomena that link particle recycling from the vessel walls in the L-mode during discharge start-up and the core confinement in the H-mode during the subsequent main heating phase. We consider available data of JET experiments that aimed at approaching fully non-inductive ITER-relevant steady-state conditions and show that the high electron temperature produced at the edge by a low recycling during start-up tends to favour the build-up of high normalized β(βN) regimes in the H-mode, the confinement being improved in a large plasma volume. To provide an insight into this complex phenomenon we have modelled the relation between particle recycling in the scrape-off layer and the evolution of plasma transport, plasma current density and shear as well as the stability properties for such experimental conditions. The results confirm the existence of a link between the confinement in the H-mode phase and the values at the edge of electron temperature, bootstrap current density and local magnetic shear during start-up. Such a link could favour these regimes to be self-sustained in time. © 2013 IOP Publishing Ltd.
Original languageEnglish
Article number045005
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume55
Issue number4
DOIs
Publication statusPublished - Apr 2013
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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