A5091721651- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Water resources management and optimization
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Particle Dynamics in Fluid Flows
- Irrigation Practices and Water Management
- Gamma-ray bursts and supernovae
- Education and Military Integration
- Cybercrime and Law Enforcement Studies
- Radiation Detection and Scintillator Technologies
- Viral Infections and Vectors
- Particle physics theoretical and experimental studies
- X-ray Spectroscopy and Fluorescence Analysis
- Fluid Dynamics Simulations and Interactions
- Astronomical Observations and Instrumentation
- Geomagnetism and Paleomagnetism Studies
- Advanced Optical Sensing Technologies
Universidad de Sevilla
2022-2025
École Polytechnique Fédérale de Lausanne
2024
Max Planck Institute for Plasma Physics
2016-2023
Centro Nacional de Aceleradores
2022
Max Planck Institute for Plasma Physics - Greifswald
2016-2021
Max Planck Society
2016-2021
Council for Scientific and Industrial Research
2012
Central University of Technology
2009
Abstract The most efficient and promising operational regime for the International Thermonuclear Experimental Reactor tokamak is high-confinement mode. In this regime, however, periodic relaxations of plasma edge can occur. These edge-localized modes pose a threat to integrity fusion device. Here we reveal strong impact energetic ions on spatio-temporal structure in tokamaks using nonlinear hybrid kinetic–magnetohydrodynamic simulations. A resonant interaction between fast at electromagnetic...
FIDASIM is a code that models signals produced by charge-exchange reactions between neutrals and ions (both fast thermal) in magnetically confined plasmas. With the ion distribution function as input, predicts efflux to neutral particle analyzer diagnostic photon radiance of Balmer-alpha light fast-ion D diagnostic, addition many other related quantities. A new, parallelized version Monte Carlo has been developed Fortran90 substantially faster than original interactive data language version....
Abstract An imaging neutral particle analyser (INPA) diagnostic has been installed and commissioned at the ASDEX Upgrade (AUG) tokamak. The AUG INPA provides energy radially resolved measurements of fast-ion (FI) distribution, complementing existing set which measure confined FI population. To this end, it analyses charge exchange (CX) neutrals produced in reactions between injected by a beam injector. These CX are ionised 20 nm carbon foil deflected towards scintillator machine magnetic...
The suppression and excitation of Alfv\'en eigenmodes have been experimentally obtained, for the first time, by means externally applied 3D perturbative fields with different spatial spectra in a tokamak plasma. perturbation causes an internal fast-ion redistribution that modifies phase-space gradients responsible driving modes, determining, ultimately their existence. Hybrid kinetic-magnetohydrodynamic simulations reveal edge resonant transport layer activated field as mechanism...
Abstract 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 n = 2, 4 as well a mixed spectrum 2 applied. Under perturbations, modes are or coil phasing between upper lower set coils. Regardless absolute rotation, an even parity for perturbation to reduce amplitude Alfvénic instabilities, while odd amplifies it. To combine...
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 is presented here along with engineering analyses system. This includes an assessment structural loads which also considers electromagnetic forces calculated possible disruption scenarios as well a mode frequency analysis Furthermore, thermal characteristics actively cooled probe head under prescribed steady state and transient heat presented....
Abstract This paper presents the first results from analysis of Balmer-alpha spectra at Wendelstein 7-X which contain broad charge exchange emission fast-ions. The measured are compared to synthetic predicted by FIDASIM code, has been supplied with 3D magnetic fields VMEC, 5D fast-ion distribution functions ASCOT, and a realistic Neutral Beam Injection geometry including beam particle blocking elements. Detailed modeling shows excellent agreement between predictions. In contrast, halo...
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 develop synthetic diagnostics for loss detectors (FILDs) of many types, such as scintillating Faraday Cup FILDs. This is first time that this done stellarator geometry with level fidelity, providing way be predicted more precisely future experiments W7-X. Simulations signal seen by FILD have completed multiple W7-X...
An edge fast-ion D-alpha (FIDA) system consisting of lines sight optimized for measurements and a newly designed prototype spectrometer have been installed at ASDEX Upgrade. The allows the full deuterium Balmer alpha spectrum with either good radial coverage or exposure times below 200 μs. It uses bar, placed in front electron multiplying charge-coupled device camera, to partially block intense unshifted light which permits simultaneous FIDA emission. Thus, not only active radiation present...
Abstract The reproducibility of diamagnetic flux measurements in vacuum field shots for the internal and external ASDEX Upgrade tokamak is investigated. A comparison predictions from equilibrium reconstruction, including pressure constraints thermal fast-ion contributions, reported. ideal magnetohydrodynamic model involved interpreting a with anisotropic summarised. plasma energy calculated reconstruction inferred compared respective values by modelling TRANSP IDE/RABBIT. It found that at...
Abstract Measurements using a recently installed edge fast-ion D-alpha (FIDA) diagnostic at the ASDEX Upgrade tokamak show clear effect of localised modes (ELMs) on passive FIDA signals. While reduction in emission is observed scrape-off layer (SOL) region, measurements close to last closed flux surface an increase signals shortly after ELMs, followed by decrease. The decrease provides sign losses SOL, while can be explained enhanced neutral density during ELMs inside plasma. In addition,...
A conceptual design of a scintillator-based fast-ion loss detector (FILD) has been developed for the Wendelstein 7-X stellarator (W7-X). Simulations using Monte Carlo codes ASCOT5 and BEAMS3D have performed to calculate expected flux neutral beam injection (NBI)-generated fast hydrogen ions onto probe head. These fluxes calculated several magnetic field configurations as well insertion positions. At maximum position, both co- counter-going losses with high incident pitch angles are observed;...
Abstract A new method was developed to model the neutral population produced by gas puff based charge exchange recombination spectroscopy systems at ASDEX Upgrade (AUG). With this method, edge impurity density on high field side (HFS) and low (LFS) can be obtained without need apply a beam injection system. The penetration needed for calculation of is with module implemented in FIDASIM code. LFS profile evaluated matches calculated standard beam-based diagnostics. Impurity temperature,...
The upgrade of the high field side (HFS) edge charge exchange recombination spectroscopy (CXRS) system ASDEX Upgrade is presented. This diagnostic provides temperature, rotation and radiance measurements impurity species by taking advantage gas puff based CXRS technique (GP-CXRS). formed a fast piezoelectric valve, that injects thermal neutrals into plasma, two optical heads. localized injection together with properly aligned lines sights (LOS) lead to spatial resolution 5–19 mm. Fast...
Abstract Here we present a new method that allows the determination of background neutral density profiles based on measurements from particle analyzers (NPA). Bayesian optimization is used to obtain reliable 5-parameter representation inferred profiles. The has been benchmarked using forward modelling FIDASIM against measured data. systematic errors coming assumptions made in analysis were evaluated and they are lower than ≲5%. tested data ASDEX Upgrade tokamak. When reconstructed profiles,...
Abstract We present a non-parametric inference of impurity transport coefficients by using charge exchange recombination spectroscopy measurements Ne X, VIII, O and C VI lines. Due to their close atomic numbers, neon, oxygen carbon ions are assumed have the same diffusion coefficient D convection velocity v . Unlike conventional techniques that modulate or perturb contents, we employ quasi-stationary plasma with static profiles. Since ratio only describes equilibrated profile sum all states,...
Coated glass targets are a key component of the Wendelstein 7-X laser blow-off system that is used for impurity transport studies. The preparation and analysis these as well their performance examined in this paper. have high damage threshold coated via physical vapor deposition with µm thick films. In addition, nm-thin layers Ti an interface layer improved ablation efficiency reduced coating stress. Hence, metallic or ceramic has lateral homogeneity within 2% contaminants less than 5%,...
Abstract We present the first validated synthetic diagnostic for fast ion loss detectors (FILDs) in Wendelstein 7-X (W7-X) stellarator. This model has been developed on, and against experimental data from, a FILD provided by National Institute Fusion Science (NIFS-FILD), with potential future applicability to existing Faraday Cup (FC-FILD) on W7-X as well scintillating (S-FILD) currently under development. A workflow combining Monte Carlo codes BEAMS3D ASCOT5 is used track ions produced...
Abstract High amplitude energetic particle geodesic acoustic mode (EGAM) oscillations driven by Neutral Beam (NBI) injected in the direction counter to toroidal plasma current are observed TCV tokamak. The modes appear at frequencies close (GAM) frequency, corresponding radii calculated without elongation corrections. spatial structure of EGAM density oscillation is analyzed using multichannel Soft X-Ray (SXR) and broadband light emission diagnostics. analysis spatiotemporal data shows a...
A feasibility study for a new edge main ion charge exchange recombination spectroscopy (CXRS) system at the ASDEX Upgrade tokamak has been carried out. This diagnostic uses fast-ion Dα (FIDA) spectrometers and optical heads of existing CXRS systems. Standard resolved temperature rotation profiles rely on observation impurity emission lines. The complexity photoemission processes fact that measured ions represent majority bulk plasma (here deuterium) make interpretation spectra in comparison...
The Water Administration System (WAS) is designed to be a management tool for irrigation schemes and water control offices that want manage their accounts supply clients through canal networks, pipelines rivers. ultimate aim of WAS optimise minimise management-related distribution losses in canals. This research projects focused on the implementation release module program at Vaalharts scheme. consists four modules are integrated into single can used PC or multi-user environment. an...