Letter
| Autor: | Cathey, Andres, Hoelzl, M., Lackner, K., Huijsmans, G. T. A., Dunne, M. G., Wolfrum, E., Pamela, S. J. P., Orain, F., Günter, S., team, the JOREK, Team, the ASDEX Upgrade, Team, the EUROfusion MST1 |
|---|---|
| Přispěvatelé: | JOREK Team, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, EUROfusion MST Team, Science and Technology of Nuclear Fusion, EIRES Eng. for Sustainable Energy Systems |
| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Tokamak Explosive material Computer Science::Neural and Evolutionary Computation FOS: Physical sciences JOREK 01 natural sciences Instability 010305 fluids & plasmas law.invention ASDEX Upgrade law Physics::Plasma Physics extended MHD 0103 physical sciences Magnetohydrodynamic drive 010306 general physics Physics non-linear MHD ELM simulations Magnetic reconnection Plasma Mechanics Condensed Matter Physics Physics - Plasma Physics Plasma Physics (physics.plasm-ph) magnetic reconnection Magnetohydrodynamics |
| Zdroj: | Nuclear Fusion Nuclear Fusion, 60(12):124007. Institute of Physics |
| ISSN: | 0029-5515 0741-3335 1402-4896 0004-637X |
| DOI: | 10.1088/1741-4326/abbc87 |
| Popis: | A triggering mechanism responsible for the explosive onset of edge localised modes (ELMs) in fusion plasmas is identified by performing, for the first time, non-linear magnetohydrodynamic simulations of repetitive type-I ELMs. Briefly prior to the ELM crash, destabilising and stabilising terms are affected at different timescales by an increasingly ergodic magnetic field caused by non-linear interactions between the axisymmetric background plasma and growing non-axisymmetric perturbations. The separation of timescales prompts the explosive, i.e. faster than exponential, growth of an ELM crash which lasts ∼ 500 μ s . The duration and size of the simulated ELM crashes compare qualitatively well with type-I ELMs in ASDEX Upgrade. As expected for type-I ELMs, a direct proportionality between the heating power in the simulations and the ELM repetition frequency is obtained. The simulations presented here are a major step forward towards predictive modelling of ELMs and of the assessment of mitigation techniques in ITER and other future tokamaks. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|