M. García-Muñoz
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View article: Tomographic reconstructions of the MAST-U Fast Ion Loss Detector using iterative algorithms
Tomographic reconstructions of the MAST-U Fast Ion Loss Detector using iterative algorithms Open
In this work, we evaluate the Kaczmarz, Coordinate Descent, and
Cimmino algorithms together with the resolution principle as stopping criteria,
using a synthetic signal model for the MAST-U FILD, complementing the
efforts recen…
View article: Diagnostics: Chapter 8 of the special issue: on the path to tokamak burning plasma operation
Diagnostics: Chapter 8 of the special issue: on the path to tokamak burning plasma operation Open
This chapter presents the activity conducted by the ITPA topical group (TG) on Diagnostics over about the last 15 years. Following a general introduction of the ITER Diagnostics led by their measurement roles, the document is organized in …
View article: Effect of n=2 externally-applied magnetic perturbations on fast-ion confinement in MAST-U
Effect of n=2 externally-applied magnetic perturbations on fast-ion confinement in MAST-U Open
Experiments with externally-applied magnetic perturbations (MPs) have been performed in MAST-U to study the effect on the fast-ion distribution. Scans performed of the current applied in the coils, the toroidal phase offset between the cur…
View article: First simultaneous observation of co- and counter-current fast-ion losses in the ASDEX Upgrade tokamak
First simultaneous observation of co- and counter-current fast-ion losses in the ASDEX Upgrade tokamak Open
In ITER and future fusion power plants, the source of the fusion born alpha particles is almost isotropic in pitch angle, thus having co- and counter-current populations. For trapped ions, the co-current side of the orbit corresponds to it…
View article: Analysis of fast-ion losses measured in MAST-U via infrared thermography and a Fast Ion Loss Detector
Analysis of fast-ion losses measured in MAST-U via infrared thermography and a Fast Ion Loss Detector Open
View article: Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime
Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime Open
Based on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combining up-down asymmetric flux surface shaping with the Low M…
View article: First microsecond velocity-space resolved simultaneous measurements of co- and counter-current fast-ion losses in forward and reverse magnetic field in a tokamak
First microsecond velocity-space resolved simultaneous measurements of co- and counter-current fast-ion losses in forward and reverse magnetic field in a tokamak Open
A novel Fast Ion Loss Detector was designed, manufactured, installed and commissioned at the Tokamak á Configuration Variable. This is the first Fast Ion Loss Detector to feature four collimators that enable simultaneous detection of co- a…
View article: Energetic particle physics: Chapter 7 of the special issue: on the path to tokamak burning plasma operation
Energetic particle physics: Chapter 7 of the special issue: on the path to tokamak burning plasma operation Open
We review the physics of energetic particles (EPs) in magnetically confined burning fusion plasmas with focus on advances since the last update of the ITER Physics Basis (Fasoli et al 2007 Nucl. Fusion 47 S264). Topics include basic EP phy…
View article: Experimental observations of fast-ion losses induced by neoclassical tearing modes in the MAST-U spherical tokamak
Experimental observations of fast-ion losses induced by neoclassical tearing modes in the MAST-U spherical tokamak Open
Neoclassical tearing modes (NTMs) have been identified as the most deleterious perturbations in high-performance plasmas at Mega Amp Spherical Tokamak Upgrade (MAST-U). They produce magnetic islands that flatten the electron temperature pr…
View article: Hybrid hydrogen-electricity production using spherical tokamaks: a cost-driver sensitivity study and techno-economic analysis
Hybrid hydrogen-electricity production using spherical tokamaks: a cost-driver sensitivity study and techno-economic analysis Open
Hybrid fusion power plants, which produce both hydrogen and electricity, are proposed as a way to decarbonise the fossil-fuel-dominated primary energy market and improve plant economics. The main cost drivers of a fusion power plant based …
View article: Effect of energetic ions on edge-localized modes in tokamak plasmas
Effect of energetic ions on edge-localized modes in tokamak plasmas Open
View article: Velocity-space analysis of fast-ion losses measured in MAST-U using a high-speed camera in the FILD detector
Velocity-space analysis of fast-ion losses measured in MAST-U using a high-speed camera in the FILD detector Open
A fast-ion loss detector (FILD) was installed for the first time at the mega amp spherical tokamak—upgrade (MAST-U) spherical tokamak during its upgrade in 2021. A new CMOS camera was installed in the MAST-U FILD acquisition system to prov…
View article: Neural networks for reconstruction and uncertainty quantification of fast-ion phase-space distributions using FILD and INPA measurements
Neural networks for reconstruction and uncertainty quantification of fast-ion phase-space distributions using FILD and INPA measurements Open
This study introduces the use of a deep convolutional neural network for reconstructing fast-ion velocity distributions from fast-ion loss detectors and imaging neutral particle analyzers (INPAs), automatically integrating uncertainty quan…
View article: Experimental research on the TCV tokamak
Experimental research on the TCV tokamak Open
Tokamak à configuration variable (TCV), recently celebrating 30 years of near-continual operation, continues in its missions to advance outstanding key physics and operational scenario issues for ITER and the design of future power plants …
View article: Performance prediction applying different reduced turbulence models to the SMART tokamak
Performance prediction applying different reduced turbulence models to the SMART tokamak Open
The SMall Aspect Ratio Tokamak (SMART) is currently being commissioned at the University of Seville and will be able to compare the performance of positive and negative triangularity plasmas at low aspect ratio. Predictive simulations have…
View article: Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime
Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime Open
Based on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combining up-down asymmetric flux surface shaping with the Low M…
View article: MHD stability analysis against pressure and current-driven modes in the SMall Aspect Ratio Tokamak
MHD stability analysis against pressure and current-driven modes in the SMall Aspect Ratio Tokamak Open
Linear magnetohydrodynamic (MHD) simulations for the SMall Aspect Ratio Tokamak (SMART) have been carried out for the first time, for both positive (PT) and negative triangularity (NT) shaped plasmas using the MARS-F code. The MHD stabilit…
View article: Design of a Thomson scattering diagnostic for the SMall Aspect Ratio Tokamak (SMART)
Design of a Thomson scattering diagnostic for the SMall Aspect Ratio Tokamak (SMART) Open
We describe the design of a Thomson scattering (TS) diagnostic to be used on the SMall Aspect Ratio Tokamak (SMART). SMART is a spherical tokamak being commissioned in Spain that aims to explore positive triangularity and negative triangul…
View article: Anisotropic regularization for inversion of fast-ion loss detector measurements
Anisotropic regularization for inversion of fast-ion loss detector measurements Open
We introduce an anisotropic regularization framework for the reconstruction of distribution functions from measurements, utilizing an approach that applies distinct regularization techniques such as non-negative constrained Tikhonov, total…
View article: Physics of the low momentum diffusivity regime in tokamaks and its experimental applicability
Physics of the low momentum diffusivity regime in tokamaks and its experimental applicability Open
Strong $E\times B$ plasma flow shear is beneficial for reducing turbulent transport. However, traditional methods of driving flow shear do not scale well to large devices such as future fusion power plants. In this paper, we use a large nu…
View article: Design and development of the magnetic diagnostic systems for the first operational phase of the SMART tokamak
Design and development of the magnetic diagnostic systems for the first operational phase of the SMART tokamak Open
A set of magnetic diagnostics has been designed, manufactured, and calibrated for the first operational phase of the small aspect ratio tokamak. The sensor suite comprises of Rogowski coils; 2D magnetic probes; and poloidal, saddle, and di…
View article: Validation of a synthetic fast ion loss detector model for Wendelstein 7-X
Validation of a synthetic fast ion loss detector model for Wendelstein 7-X Open
We present the first validated synthetic diagnostic for fast ion loss detectors (FILDs) in the Wendelstein 7-X (W7-X) stellarator. This model has been developed on, and validated against experimental data from, a FILD provided by the Natio…
View article: Design of a Thomson scattering diagnostic for the SMART tokamak
Design of a Thomson scattering diagnostic for the SMART tokamak Open
We describe the design of a Thomson scattering (TS) diagnostic to be used on the SMall Aspect Ratio Tokamak (SMART). SMART is a spherical tokamak being commissioned in Spain that aims to explore positive triangularity (PT) and negative tri…
View article: Simulation of a scintillator-based fast ion loss detector for steady-state operation in Wendelstein 7-X (invited)
Simulation of a scintillator-based fast ion loss detector for steady-state operation in Wendelstein 7-X (invited) Open
A quantitative theoretical framework has been created to model neutral beam injection and fast ion losses in the Wendelstein 7-X (W7-X) stellarator, including a novel method to develop synthetic diagnostics for fast ion loss detectors (FIL…
View article: Observation of alpha-particles in recent D–T experiments on JET
Observation of alpha-particles in recent D–T experiments on JET Open
The fusion reaction between deuterium and tritium, D ( T,n ) 4 He is the main source of energy in future thermonuclear reactors. Alpha-particles ( 4 He -ions) born with an average energy of 3.5 MeV transferring energy to the thermal plasma…
View article: Overview of fast particle experiments in the first MAST Upgrade experimental campaigns
Overview of fast particle experiments in the first MAST Upgrade experimental campaigns Open
MAST-U is equipped with on-axis and off-axis neutral beam injectors (NBI), and these external sources of super-Alfvénic deuterium fast-ions provide opportunities for studying a wide range of phenomena relevant to the physics of alpha-parti…
View article: Poloidal structure of the edge parallel flow in H-mode, L-mode and I-mode confinement regimes
Poloidal structure of the edge parallel flow in H-mode, L-mode and I-mode confinement regimes Open
Impurity profiles have been measured with the edge high field side (HFS) and low field side (LFS) charge exchange recombination spectroscopy suite at ASDEX Upgrade enabling the study of the poloidal structure of the edge parallel flow in H…
View article: Development of a scintillator based fast-ion loss detector for the Wendelstein 7-X stellarator
Development of a scintillator based fast-ion loss detector for the Wendelstein 7-X stellarator Open
A new scintillator based fast-ion loss detector (FILD) system has been designed for the Wendelstein 7-X (W7-X) stellarator. The mechanical design of the system is presented here along with engineering analyses of the system. This includes …
View article: Physical insights from the aspect ratio dependence of turbulence in negative triangularity plasmas
Physical insights from the aspect ratio dependence of turbulence in negative triangularity plasmas Open
In this work, we study the impact of aspect ratio (the ratio of major radius R 0 to minor radius r) on the confinement benefits of negative triangularity (NT) plasma shaping. We use high-fidelity flux tube gyrokinetic GENE simula…
View article: Active control of Alfvén eigenmodes by external magnetic perturbations with different spatial spectra
Active control of Alfvén eigenmodes by external magnetic perturbations with different spatial spectra Open
Alfvén eigenmodes have been suppressed and excited in tokamak plasmas by (just) modifying the poloidal spectra of externally applied static magnetic perturbations. This effect is observed experimentally when toroidal spectra of n = 2, n = …