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

被引：19

作者：

Gobbin, M. ^{[1
]}

Bonfiglio, D. ^{[1
]}

Boozer, A. H. ^{[2
]}

Cooper, A. W. ^{[3
]}

Escande, D. F. ^{[4
]}

Hirshman, S. P. ^{[5
]}

Lore, J. ^{[5
]}

Lorenzini, R.

Marrelli, L. ^{[1
]}

Martin, P. ^{[1
]}

Martines, E. ^{[1
]}

Momo, B. ^{[1
]}

Pomphrey, N. ^{[6
]}

Predebon, I. ^{[1
]}

Puiatti, M. E. ^{[1
]}

Sanchez, R. ^{[5
]}

Spizzo, G. ^{[1
]}

Spong, D. A. ^{[5
]}

Terranova, D. ^{[1
]}

机构：

[1] Assoc EURATOM ENEA Fus Corso Stati Uniti 4, Consorzio RFX, I-35127 Padua, Italy

[2] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[3] Assoc Euratom Confederat Suisse, EPFL, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland

[4] Univ Aix Marseille 1, CNRS, UMR 6633, F-13397 Marseille, France

[5] ORNL Fus Energy Div, Oak Ridge, TN 37831 USA

[6] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 06期

关键词：

STABILITY; PARADIGM; PLASMAS;

D O I：

10.1063/1.3602083

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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/nu 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. [doi:10.1063/1.3602083]

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页数：10

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