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Mostrando ítems 221-230 de 230
Artículo
Detection of Causal Relations in Time Series Affected by Noise in Tokamaks Using Geodesic Distance on Gaussian Manifolds
(MDPI, 2017-10)
Modern experiments in Magnetic Confinement Nuclear Fusion can produce Gigabytes of data, mainly in form of time series. The acquired signals, composing massive databases, are typically affected by significant levels of ...
Artículo
Transport and acceleration mechanism of fast ions during edge localized modes in ASDEX Upgrade
(IOP Publishing, 2023)
Observations of enhanced fast-ion losses during edge localized modes (ELMs) have been reported in the ASDEX Upgrade tokamak, revealing losses above the injection energy. This suggests that fast ions can be accelerated and ...
Artículo
Solitary magnetic perturbations at the ELM onset
(IOP Publishing, 2012-11)
Tokamak H-mode plasmas frequently exhibit edge-localized modes (ELMs). ELMs allow maintaining sufficient plasma purity and thus enable stationary H-mode. On the other hand in a future device ELMs may cause divertor power ...
Tesis Doctoral
Imaging neutral particle analyzer for fast-ion transport measurements in the ASDEX upgrade tokamak
(2024-03-19)
In future fusion reactors, suprathermal particles (fast ions, FI) will play a key role in the generation of fusion power as they are an important source of energy (heating) and momentum (current drive). A loss of their ...
Artículo
Modelling of Energetic Particle Drive and Damping Effects on TAEs in AUG Experiment with ECCD
(Institute of Physics Publishing, 2024)
The impact of electron cyclotron current drive (ECCD)-driven current on toroidicity-induced Alfvén eigenmodes (TAEs) in experiments on the AUG tokamak is investigated numerically. The dynamical evolution of the plasma ...
Artículo
Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra
(IOP Publishing, 2014-02)
We present the first measurement of a local fast-ion 2D velocity distribution function f (v , v⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light ...
Artículo
Magnetic equilibrium design for the SMART tokamak
(Elsevier Ltd, 2021)
The SMall Aspect Ratio Tokamak (SMART) device is a new compact (plasma major radius Rgeo≥0.40 m, minor radius a≥0.20 m, aspect ratio A≥1.7) spherical tokamak, currently in development at the University of Seville. The SMART ...
Artículo
Commissioning of the imaging neutral particle analyser for the ASDEX Upgrade tokamak
(IOP Publishing Ltd., 2022-02)
An imaging neutral particle analyser (INPA) diagnostic has been installed and commissioned at the ASDEX Upgrade (AUG) tokamak. The AUG INPA diagnostic provides energy and radially resolved measurements of the fast-ion (FI) ...
Artículo
Phase-space resolved measurement of 2nd harmonic ion cyclotron heating using FIDA tomography at the ASDEX Upgrade tokamak
(Institute of Physics Publishing, 2017)
Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade allow to reconstruct the fast-ion phase space at several radial positions with decent energy and pitch resolution. These new diagnostic capabilities ...
Artículo
Alfven eigenmode stability and fast ion loss in DIII-D and ITER reversed magnetic shear plasmas
(IOP Publishing, 2012-09)
Neutral beam injection into reversed-magnetic shear DIII-D plasmas produces a variety of Alfvenic activity including ´ toroidicity-induced Alfven eigenmodes (TAEs) and reversed shear Alfv ´ en eigenmodes (RSAEs). With ...