A5032219289- Magnetic confinement fusion research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Algorithms and Data Compression
- Parallel Computing and Optimization Techniques
- Plasma and Flow Control in Aerodynamics
- Cancer-related Molecular Pathways
- VLSI and Analog Circuit Testing
- Distributed and Parallel Computing Systems
- Global trade, sustainability, and social impact
- Atomic and Subatomic Physics Research
- Electromagnetic Scattering and Analysis
- Anomaly Detection Techniques and Applications
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Fault Detection and Control Systems
- Nuclear Materials and Properties
- Global trade and economics
- Cyclone Separators and Fluid Dynamics
- Plasma Diagnostics and Applications
University of Lisbon
2010-2024
Royal Military Academy
2020
Instituto Superior Técnico
2009-2017
Harvard University Press
2014
Inter-American Development Bank
2014
Massachusetts Institute of Technology
2014
Abstract The JET 2019–2020 scientific and technological programme exploited the results of years concerted engineering work, including ITER-like wall (ILW: Be W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major neutral beam injection upgrade providing record power 2019–2020, tested technical procedural preparation for safe operation with tritium. Research along three complementary axes yielded wealth new results. Firstly, plasma delivered scenarios...
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
The 2014–2016 JET results are reviewed in the light of their significance for optimising ITER research plan active and non-active operation. More than 60 h plasma operation with first wall materials successfully took place since its installation 2011. New multi-machine scaling type I-ELM divertor energy flux density to is supported by principle modelling. relevant disruption experiments modelling reported a set three mitigation valves mimicking setup. Insights L–H power threshold Deuterium...
Abstract For the past several years, JET scientific programme (Pamela et al 2007 Fusion Eng. Des . 82 590) has been engaged in a multi-campaign effort, including experiments D, H and T, leading up to 2020 first with 50%/50% D–T mixtures since 1997 ever plasmas ITER mix of plasma-facing component materials. this purpose, concerted physics technology was launched view prepare campaign (DTE2). This paper addresses key elements developed by directly contributing preparation. intense preparation...
The objective of thermonuclear fusion consists producing electricity from the coalescence light nuclei in high temperature plasmas. most promising route to envisages confinement such plasmas with magnetic fields, whose studied configuration is tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one main potential showstoppers on a commercial reactor. In this work we report how, deploying innovative analysis methods thousands JET experiments covering isotopic...
Asymmetrical disruptions may occur during ITER operation and they be accompanied by large sideways forces rotation of the asymmetry. This is particular concern because resonance rotating asymmetry with natural frequencies vacuum vessel (and other in-vessel components) could lead to dynamic amplification forces. A significant fraction non-mitigated JET have toroidally asymmetric currents that flow partially inside plasma surrounding ('wall'). The toroidal asymmetries (otherwise known as...
JET’s frequency-modulated continuous wave (FMCW) reflectometers have been operating well with the current design since 2005, and density profiles automatically calculated intershot then. However, had long suffered from several shortcomings: poor agreement other diagnostics, sometimes inappropriately moving radially by centimeters, elevated levels of radial jitter, persistent wriggles (strong unphysical oscillations). In this research, techniques are applied to reflectometry data analysis,...
Abstract A sequence of fuel recovery methods was tested in JET, equipped with the ITER-like beryllium main chamber wall and tungsten divertor, to reduce plasma deuterium concentration less than 1% preparation for operation tritium. This also a key activity regard refining clean-up strategy be implemented at end 2nd DT campaign JET (DTE2) assess tools that are envisaged mitigate tritium inventory build-up ITER. The began 4 days baking 320 °C, followed by further which Ion Cyclotron Wall...
At the tokamak Joint European Torus (JET), electron cyclotron emission spectra in O-mode and X-mode polarisations are diagnosed simultaneous absolute terms for several harmonics with two Martin-Puplett interferometers. From second harmonic range polarisation, temperature profile can be deduced outboard side (low magnetic field strength) of JET but only some parts inboard (high strength). This spatial restriction bypassed, if a cutoff is not present inside plasma waves first range. Then, from...
Identification of the mechanisms for H-mode density limit in machines with fully metallic walls, and their scaling to future devices is essential find these optimal operational boundaries highest attainable confinement. Systematic investigations plasmas experiments deuterium external gas fuelling have been performed on JET AUG results compared one another. Basically, operation phases are identical both tokamaks: stable phase, degrading breakdown energy confinement deterioration usually...
Kinetic plasma simulations using an electromagnetic particle-in-cell (PIC) algorithm have become the tool of choice for numerical modeling several astrophysical and laboratory scenarios, ranging from shocks shell collisions, to high-intensity laser-plasma interactions, with applications fast ignition particle acceleration. However, fully relativistic kinetic codes are computationally intensive, new computing paradigms required one-to-one direct these scenarios. In this paper, we look at use...
In order to understand the mechanisms for H-mode density limit in machines with fully metallic walls, systematic investigations of plasmas experiments deuterium and hydrogen external gas fuelling have been performed on JET-ILW.The observed JET D-as well as H-plasmas demonstrates similar operation phases: stable phase, degrading H-mode, breakdown energy confinement deterioration accompanied by a dithering cycling followed L-mode phase.The is not related an inward collapse hot core plasma due...
Future tokamak reactors of conventional design will require high levels exhaust power dissipation (more than 90% the input power) if densities at divertor targets are to remain compatible with active cooling. Impurity seeded H-mode discharges in JET-ITER-like Wall (ILW) have reached a maximum radiative fraction (Frad) ∼75%. Divertor Langmuir probe (LP) measurements these indicate, however, that less ∼3% thermal plasma reaches targets, suggesting missing channel for loss. This paper presents...
We demonstrate an implementation of the Boris Particle Pusher Algorithm using CUDA‐enabled processors. A simplified PIC code is used as a reference for pusher and several tests are shown. The deployment time from developer point view also evaluated. Results show that CUDA good tool significant acceleration with minimal impact effort developer.
This paper develops a global model based on non-local properties of fractional derivatives for fusion plasmas. The results confirm that transport in the largest device i.e. JET, is better predicted. expected to provide an insight proper kinetic description plasmas, and improve accuracy predictions.