A5014506053- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Target Tracking and Data Fusion in Sensor Networks
- Nuclear reactor physics and engineering
- Advanced Frequency and Time Standards
- Particle accelerators and beam dynamics
Chalmers University of Technology
2016-2020
Max Planck Society
2014-2019
Max Planck Institute for Plasma Physics
2016-2019
Technical University of Denmark
2019
Particle transport has been extensively studied by performing several dimensionally matched collisionality scans in various plasma scenarios JET.Gas puff modulation technique developed with high quality time-dependent density profile measurements to determine particle coefficients.Density peaking found increase decreasing * all H-mode while L-mode, no dependency was found.The experimentally determined coefficients suggest that NBI fueling is main contributor the observed H-mode.This...
Neoclassical and turbulent transport in tokamaks has been studied extensively over the past decades, but their possible interaction remains largely an open question. The two are only truly independent if length scales governing each of them sufficiently separate, i.e., ratio ρ* between ion gyroradius pressure gradient scale is small. This not case particularly interesting regions such as barriers. Global simulations a collisional ion-temperature-gradient-driven microturbulence performed with...
Hollow density profiles may occur in connection with pellet fuelling and L to H transitions. A positive gradient could potentially stabilize the turbulence or change relation between convective diffusive fluxes, thereby reducing turbulent transport of particles towards center, making scheme inefficient. In present work, particle driven by Ion Temperature Gradient/Trapped Electron (ITG/TE) mode hollow is studied fluid as well gyrokinetic simulations. The model used, an extended version...
Abstract Transport modelling of Joint European Torus (JET) dimensionless collisionality scaling experiments in various operational scenarios is presented. Interpretative simulations at a fixed radial position are combined with predictive JETTO temperatures and densities, using the TGLF transport model. The model includes electromagnetic effects collisions as well <?CDATA $\vec{E}\times \vec{B}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover...
Abstract The effect of fast ions on turbulent particle transport, driven by ion temperature gradient (ITG)/trapped electron mode turbulence, is studied. Two neutral beam injection (NBI) heated JET discharges in different regimes are analyzed at the radial position ρ t = 0.6, one them an L-mode and other H-mode discharge. Results obtained from computationally efficient fluid model EDWM gyro-fluid TGLF compared to linear nonlinear gyrokinetic GENE simulations as well experimentally density...
Hollow density profiles occur in connection with pellet fuelling and L to H transitions. A positive gradient could potentially stabilize the turbulence or change relation between convective diffusive fluxes, thereby reducing turbulent transport of particles towards center, making scheme inefficient. In present work, particle driven by ITG/TE mode regions hollow is studied fluid as well gyrokinetic simulations. The model used, an extended version Weiland model, Extended Drift Wave Model...
We present a method to estimate the mean and uncertainty of fluctuating quantities, such as spatially averaged density temperature fluctuations or radial fluxes, from initial value simulations Eulerian gyrokinetic code GENE[1, 2]. Since time series are autocorrelated in time, data is grouped into batches based on autocorrelation their means form sample for further statistical treatment, calculating standard error mean.Based this we develop stopping rule nonlinear simulation: First,...
Abstract Transport modelling, for two dimensionless collisionality scaling experiments at the Joint European Torus (JET) and DIII-D with three discharges each, is presented. Experimental data from JET (Tala et al 2019 Nucl. Fusion 59 126030) (Mordijck 2020 60 066019) show a dissimilar dependence in density peaking source turbulent transport. The scan that dominant peaking, which contrary to where transport main cause peaking. In this article, different dependency on studied by investigating...