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Three-dimensional equilibria and transport in RFX-mod: A description using stellarator tools (Articolo in rivista)

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Three-dimensional equilibria and transport in RFX-mod: A description using stellarator tools (Articolo in rivista) (literal)

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M. Gobbin; D. Bonfiglio; A. H. Boozer; A. W. Cooper; D. F. Escande; S. P. Hirshman; J. Lore; R. Lorenzini; L. Marrelli; P. Martin; E. Martines; B. Momo; N. Pomphrey; I. Predebon; M. E. Puiatti; R. Sanchez; G. Spizzo; D. A. Spong; D. Terranova; RFX-mod Team (2011)
Three-dimensional equilibria and transport in RFX-mod: A description using stellarator tools
in Physics of plasmas; American Institute of Physics, Melville [NY] (Stati Uniti d'America)
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M. Gobbin; D. Bonfiglio; A. H. Boozer; A. W. Cooper; D. F. Escande; S. P. Hirshman; J. Lore; R. Lorenzini; L. Marrelli; P. Martin; E. Martines; B. Momo; N. Pomphrey; I. Predebon; M. E. Puiatti; R. Sanchez; G. Spizzo; D. A. Spong; D. Terranova; RFX-mod Team (literal)

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Article Number: 062505 - La rivista è pubblicata anche online con ISSN 1089-7674. (literal)

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1 Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione Corso Stati Uniti 4, 35127 Padova, Italy; - 2 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA; - 3 EPFL, Association EURATOM-Confederation Suisse, Centre de Recherches en Physique des Plasmas, Lausanne CH-1015, Switzerland; - 4 UMR 6633 CNRS-Universite de Provence, Marseille F13397, France; - 5 ORNL Fusion Energy Division, Oak Ridge, Tennessee 37831, USA; - 6 Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA. (M. Gobbin,1,b) D. Bonfiglio,1 A. H. Boozer,2 A. W. Cooper,3 D. F. Escande,4 S. P. Hirshman,5 J. Lore,5 R. Lorenzini,1 L. Marrelli,1 P. Martin,1 E. Martines,1 B. Momo,1 N. Pomphrey,6 I. Predebon,1 M. E. Puiatti,1 R. Sanchez,5 G. Spizzo,1 D. A. Spong,5 D. Terranova,1 and RFX-mod Team) (literal)

Titolo

Three-dimensional equilibria and transport in RFX-mod: A description using stellarator tools (literal)

Abstract

RFX-mod self-organized single helical axis (SHAx) states provide a unique opportunity to advance 3D fusion physics and establish a common knowledge basis in a parameter region not covered by stellarators and tokamaks. The VMEC code has been adapted to the reversed-field pinch (RFP) to model SHAx equilibria in fixed boundary mode with experimental measurements as constraint. The averaged particle diffusivity over the helical volume, estimated with the Monte Carlo code ORBIT, has a neoclassical-like dependence on collisionality and does not show the 1/ trend of un-optimized stellarators. In particular, the helical region boundary, corresponding to an electron transport barrier with zero magnetic shear and improved confinement, has been investigated using numerical codes common to the stellarator community. In fact, the DKES/PENTA codes have been applied to RFP for local neoclassical transport computations, including radial electric field, to estimate thermal diffusion coefficients in the barrier region for typical RFX-mod temperature and density profiles. A comparison with power balance estimates shows that residual chaos due to secondary tearing modes and small-scale turbulence still contribute to drive anomalous transport in the barrier region. (literal)

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