1. Edge localized mode rotation and the nonlinear dynamics of filaments
- Author
-
Eric Nardon, A. Fil, Guilhem Dif-Pradalier, Xavier Garbet, Stanislas Pamela, C. Passeron, G. Latu, Gta Guido Huijsmans, P. Cahyna, F. Orain, Jorge Morales, Marina Becoulet, Matthias Hoelzl, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Institute of Plasma Physics [Praha], Czech Academy of Sciences [Prague] (CAS), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS]Physics [physics] ,Physics ,Tokamak ,Computer Science::Neural and Evolutionary Computation ,Magnetic reconnection ,Mechanics ,Condensed Matter Physics ,Rotation ,01 natural sciences ,Ballooning ,010305 fluids & plasmas ,law.invention ,Nonlinear system ,Physics::Plasma Physics ,law ,0103 physical sciences ,Mean flow ,[NLIN]Nonlinear Sciences [physics] ,Atomic physics ,010306 general physics ,Shear flow ,Edge-localized mode ,ComputingMilieux_MISCELLANEOUS - Abstract
Edge Localized Modes (ELMs) rotating precursors were reported few milliseconds before an ELM crash in several tokamak experiments. Also, the reversal of the filaments rotation at the ELM crash is commonly observed. In this article, we present a mathematical model that reproduces the rotation of the ELM precursors as well as the reversal of the filaments rotation at the ELM crash. Linear ballooning theory is used to establish a formula estimating the rotation velocity of ELM precursors. The linear study together with nonlinear magnetohydrodynamic simulations give an explanation to the rotations observed experimentally. Unstable ballooning modes, localized at the pedestal, grow and rotate in the electron diamagnetic direction in the laboratory reference frame. Approaching the ELM crash, this rotation decreases corresponding to the moment when the magnetic reconnection occurs. During the highly nonlinear ELM crash, the ELM filaments are cut from the main plasma due to the strong sheared mean flow that is non...
- Published
- 2016