F. Orain
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View article: Non-linear extended MHD simulations of type-I edge localised mode cycles in ASDEX Upgrade and their underlying triggering mechanism
Non-linear extended MHD simulations of type-I edge localised mode cycles in ASDEX Upgrade and their underlying triggering mechanism Open
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 prio…
View article: En route to realistic modeling of the kinetic-MHD interaction between macroscopic modes and fast particles induced by neutral beam injection in tokamaks
En route to realistic modeling of the kinetic-MHD interaction between macroscopic modes and fast particles induced by neutral beam injection in tokamaks Open
A new model of fast ion source induced by Neutral Beam Injection (NBI) in tokamaks has been implemented in the hybrid kinetic-magnetohydrodynamic code XTOR-K. This source, combined with the collisions also recently implemented, allows for …
View article: Observation of accelerated beam ion population during edge localized modes in the ASDEX Upgrade tokamak
Observation of accelerated beam ion population during edge localized modes in the ASDEX Upgrade tokamak Open
The interaction between fast-ions and edge localized modes (ELMs) is investigated by means of fast-ion loss detector measurements. Fast-ion losses are increased during ELMs exhibiting a 3D filamentary-like behaviour. An accelerated beam io…
View article: Non-linear modeling of the threshold between ELM mitigation and ELM suppression by Resonant Magnetic Perturbations in ASDEX Upgrade
Non-linear modeling of the threshold between ELM mitigation and ELM suppression by Resonant Magnetic Perturbations in ASDEX Upgrade Open
The interaction between Edge Localized Modes (ELMs) and Resonant Magnetic Perturbations (RMPs) is modeled with the magnetohydrodynamic code JOREK using experimental parameters from ASDEX Upgrade discharges. The ELM mitigation or suppressio…
View article: ELM-induced cold pulse propagation in ASDEX Upgrade
ELM-induced cold pulse propagation in ASDEX Upgrade Open
In ASDEX Upgrade, the propagation of cold pulses induced by type-I edge localized modes (ELMs) is studied using electron cyclotron emission measurements, in a dataset of plasmas with moderate triangularity. It is found that the edge safety…
View article: Comprehensive linear model for the <i>n</i> = <i>m</i> = 1 fishbone kinetic-MHD instability
Comprehensive linear model for the <i>n</i> = <i>m</i> = 1 fishbone kinetic-MHD instability Open
Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas 2018 27–31 August 2018, Varenna, Italy
View article: Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations Open
The impact of three-dimensional (3D) tokamak geometry from external magnetic perturbations on edge instabilities has been examined in high confinement mode plasmas with edge localised modes (ELMs) in ASDEX Upgrade. The 3D geometry has been…
View article: Beam-Ion Acceleration during Edge Localized Modes in the ASDEX Upgrade Tokamak
Beam-Ion Acceleration during Edge Localized Modes in the ASDEX Upgrade Tokamak Open
The acceleration of beam ions during edge localized modes (ELMs) in a tokamak is observed for the first time through direct measurements of fast-ion losses in low collisionality plasmas. The accelerated beam-ion population exhibits well-lo…
View article: Insights into type‐I edge localized modes and edge localized mode control from JOREK non‐linear magneto‐hydrodynamic simulations
Insights into type‐I edge localized modes and edge localized mode control from JOREK non‐linear magneto‐hydrodynamic simulations Open
Edge localized modes (ELMs) are repetitive instabilities driven by the large pressure gradients and current densities in the edge of H‐mode plasmas. Type‐I ELMs lead to a fast collapse of the H‐mode pedestal within several hundred microsec…
View article: Acceleration of beam ions during edge localized modes in the ASDEX Upgrade tokamak
Acceleration of beam ions during edge localized modes in the ASDEX Upgrade tokamak Open
Trabajo presentado en el 45th EPS Conference on Plasma Physics, celebrada en Praga (República Checa), del 2 al 6 de julio de 2018
View article: Nonlinear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high<i>Q</i>scenarios
Nonlinear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high<i>Q</i>scenarios Open
In nonlinear MHD simulations of DIII-D QH-mode plasmas it has been found that low n kink/peeling modes (KPMs) are unstable and grow to a saturated kink-peeling mode. The features of the dominant saturated KPMs, which are localised toroidal…
View article: Recent progress in the quantitative validation of JOREK simulations of ELMs in JET
Recent progress in the quantitative validation of JOREK simulations of ELMs in JET Open
Future devices like JT-60SA, ITER and DEMO require quantitative predictions of pedestal density and temperature levels, as well as inter-ELM and ELM divertor heat fluxes, in order to improve global confinement capabilities while preventing…
View article: Non-linear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high Q scenarios
Non-linear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high Q scenarios Open
International audience
View article: Effects of strong density fluctuations at the plasma edge on ECEI measurements at ASDEX Upgrade
Effects of strong density fluctuations at the plasma edge on ECEI measurements at ASDEX Upgrade Open
Not available.
View article: Modeling edge MHD instabilities and their interaction with magnetic perturbations in ASDEX Upgrade
Modeling edge MHD instabilities and their interaction with magnetic perturbations in ASDEX Upgrade Open
Not available.
View article: Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade
Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade Open
Here, the interaction of externally applied small non-axisymmetric magnetic perturbations (MP) with tokamak high-confinement mode (H-mode) plasmas is reviewed and illustrated by recent experiments in ASDEX Upgrade. The plasma response to t…
View article: Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade
Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade Open
The plasma response to resonant magnetic perturbations (RMPs) in ASDEX Upgrade is modeled with the non-linear resistive MHD code JOREK, using input profiles that match those of the experiments as closely as possible. The RMP configuration …
View article: Non-linear MHD Simulations of Pellet Triggered ELMs in JET and ASDEX Upgrade tokamaks
Non-linear MHD Simulations of Pellet Triggered ELMs in JET and ASDEX Upgrade tokamaks Open
ITER operation in its high fusion performance DT scenarios relies on the achievement of the H-mode confinement regime, which is expected to lead to the quasi-periodic triggering of ELMs (Edge Localized Modes). The energy fluxes associated …
View article: Edge localized mode rotation and the nonlinear dynamics of filaments
Edge localized mode rotation and the nonlinear dynamics of filaments Open
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 pres…
View article: Modelling of spatial structure of divertor footprints caused by edge-localized modes mitigated by magnetic perturbations
Modelling of spatial structure of divertor footprints caused by edge-localized modes mitigated by magnetic perturbations Open
Resonant magnetic perturbations (RMPs) can mitigate the edge-localized modes (ELMs), i.e. cause a change of the ELM character towards smaller energy loss and higher frequency. During mitigation a change of the spatial structure of ELM load…
View article: Three-dimensional non-linear magnetohydrodynamic modeling of massive gas injection triggered disruptions in JET
Three-dimensional non-linear magnetohydrodynamic modeling of massive gas injection triggered disruptions in JET Open
JOREK 3D non-linear MHD simulations of a D2 Massive Gas Injection (MGI) triggered disruption in JET are presented and compared in detail to experimental data. The MGI creates an overdensity that rapidly expands in the direction parallel to…
View article: Resistive Reduced MHD Modeling of Multi-Edge-Localized-Mode Cycles in Tokamak<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi></mml:math>-Point Plasmas
Resistive Reduced MHD Modeling of Multi-Edge-Localized-Mode Cycles in Tokamak-Point Plasmas Open
The full dynamics of a multi-edge-localized-mode (ELM) cycle is modeled for the first time in realistic tokamak X-point geometry with the nonlinear reduced MHD code jorek. The diamagnetic rotation is found to be instrumental to stabilize t…