L to H mode transition: parametric dependencies of the temperature threshold
| Autor: | Alexander Lukin, Stefan Matejcik, Soare Sorin, Francesco Romanelli, Emilio Blanco, Ephrem Delabie, Guilhem Dif-Pradalier, Bohdan Bieg, Fulvio Militello, Vladislav Plyusnin, José Vicente, Alberto Loarte, Rajnikant Makwana, CHIARA MARCHETTO, Marco Wischmeier, Choong-Seock Chang, Aneta Gójska, Laurent Chôné, Manuel Garcia-munoz, Laure Vermare |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. RNM138: Física Nuclear Aplicada, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Dutch Institute for Fundamental Energy Research [Nieuwegein] (DIFFER), Joint European Torus (JET-EFDA), Culham Science Centre [Abingdon], Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU) |
| Rok vydání: | 2015 |
| Předmět: |
Physics
[PHYS]Physics [physics] Nuclear and High Energy Physics Tokamak Condensed matter physics Turbulence Plasma Electron Collisionality Condensed Matter Physics 01 natural sciences Effective nuclear charge 010305 fluids & plasmas Magnetic field law.invention Plasma physics law Electric field 0103 physical sciences L H transition Atomic physics 010306 general physics |
| Zdroj: | idUS: Depósito de Investigación de la Universidad de Sevilla Universidad de Sevilla (US) Nuclear Fusion Nuclear Fusion, 2015, 55 (7), ⟨10.1088/0029-5515/55/7/073015⟩ Nuclear Fusion, IOP Publishing, 2015, 55 (7), ⟨10.1088/0029-5515/55/7/073015⟩ Nuclear Fusion, 55, 073015 idUS. Depósito de Investigación de la Universidad de Sevilla instname |
| ISSN: | 0029-5515 1741-4326 0741-3335 1742-6596 |
| Popis: | International audience; The L to H mode transition occurs at a critical power which depends on ă various parameters, such as the magnetic field, the density, etc. ă Experimental evidence on various tokamaks (JET, ASDEX-Upgrade, DIII-D, ă Alcator C-Mod) points towards the existence of a critical temperature ă characterizing the transition. This criterion for the L-H transition is ă local and is therefore easier to be compared to theoretical approaches. ă In order to shed light on the mechanisms of the transition, simple ă theoretical ideas are used to derive a temperature threshold (T-th). ă They are based on the stabilization of the underlying turbulence by a ă mean radial electric field shear. The nature of the turbulence varies as ă the collisionality decreases, from resistive ballooning modes to ion ă temperature gradient and trapped electron modes. The obtained parametric ă dependencies of the derived T-th are tested versus magnetic field, ă density, effective charge. Various robust experimental observations are ă reproduced, in particular T-th increases with magnetic field B and ă increases with density below the density roll-over observed on the power ă threshold. |
| Databáze: | OpenAIRE |
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