D. Gallart
A5086037545- Magnetic confinement fusion research
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Nuclear reactor physics and engineering
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Quantum chaos and dynamical systems
- Ion-surface interactions and analysis
- Chaos control and synchronization
- High-Energy Particle Collisions Research
- Fault Detection and Control Systems
- X-ray Spectroscopy and Fluorescence Analysis
- Anomaly Detection Techniques and Applications
- High voltage insulation and dielectric phenomena
- Reservoir Engineering and Simulation Methods
- Nuclear Materials and Properties
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- Atomic and Subatomic Physics Research
Barcelona Supercomputing Center
2016-2025
Universitat Politècnica de Catalunya
2016-2025
Institució Catalana de Recerca i Estudis Avançats
2020
Royal Military Academy
2020
Abstract The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with ITER-like Be/W wall. development started pure Deuterium refinement of current, and toroidal magnetic field choices succeeded solving heat load challenges arising 37 MW injected power ITER like environment, keeping radiation edge core controlled, avoiding MHD instabilities reaching high neutron rates. have re-run Tritium...
The JET exploitation plan foresees D–T operations in 2020 (DTE2). With respect to the first campaign 1997 (DTE1), when was equipped with a carbon wall, experiments will be conducted presence of beryllium–tungsten ITER-like wall and benefit from an extended improved set diagnostics higher additional heating power (32 MW neutral beam injection + 8 ion cyclotron resonance heating). There are several challenges presented by new wall: general deterioration pedestal confinement; risk heavy...
This paper summarizes the physical principles behind novel three-ion scenarios using radio frequency waves in ion cyclotron range of frequencies (ICRF). We discuss how to transform mode conversion electron heating into a new flexible ICRF technique for and fast-ion generation multi-ion species plasmas. The theoretical section provides practical recipes selecting plasma composition realize scenarios, including two equivalent possibilities choice resonant absorbers that have been identified....
Abstract In the paper we present an overview of interpretive modelling a database JET-ILW 2021 D-T discharges using TRANSP code. The main aim is to assess our capability computationally reproducing fusion performance various plasma scenarios different external heating and mixtures, understand driving mechanisms. We find that simulations confirm general power-law relationship between increasing power output, which supported by absolutely calibrated neutron yield measurements. A comparison...
Abstract We present an overview of results from a series L–H transition experiments undertaken at JET since the installation ITER-like-wall (JET-ILW), with beryllium wall tiles and tungsten divertor. Tritium, helium deuterium plasmas have been investigated. Initial in tritium show ohmic transitions low density power threshold for ( P LH ) is lower than ones densities, while we still lack contrasted data to provide scaling high densities. In there notable shift which minimum <?CDATA...
Abstract The recent deuterium–tritium campaign in JET-ILW (DTE2) has provided a unique opportunity to study the isotope dependence of L-H power threshold an ITER-like wall environment (Be and W divertor). Here we present results from dedicated transition experiments at JET-ILW, documenting tritium plasmas, comparing them with matching deuterium hydrogen datasets. From earlier it is known that as plasma isotopic composition changes deuterium, through varying deuterium/hydrogen concentrations,...
Abstract JET experiments using the fuel mixture envisaged for fusion power plants, deuterium and tritium (D–T), provide a unique opportunity to validate existing D–T prediction capabilities in support of future device design operation preparation. The 2021 experimental campaign has achieved powers sustained over 5 s ITER-relevant conditions i.e. with baseline or hybrid scenario full metallic wall. In preparation campaign, extensive predictive modelling was carried out several assumptions...
Abstract The reference ion cyclotron resonance frequency (ICRF) heating schemes for ITER deuterium–tritium (D-T) plasmas at the full magnetic field of 5.3 T are second harmonic and 3 He minority heating. wave-particle location these coincide central a wave 53 MHz T. Experiments have been carried out in major D-T campaign (DTE2) JET, its prior D campaigns, to integrate ICRF scenarios JET high-performance compare their performance with commonly used hydrogen (H) In 50:50 D:T plasmas, up 35% 5%...
Predictability of burning plasmas is a key issue for designing and building credible future fusion devices. In this context, an important effort physics understanding guidance being carried out in parallel to JET experimental campaigns H D by performing analyses modelling towards improvement the DT optimization JET-DT neutron yield born alpha particle physics. Extrapolations from recent experiments using maximum power available have been performed including some most sophisticated codes...
A strong modelling program has been started in support of the future JET-DT campaign with aim guiding experiments deuterium (D) towards maximizing fusion energy production Deuterium–Tritium (DT). Some key elements have identified by using several most updated and sophisticated models for predicting heat particle transport, pedestal pressure heating sources an integrated framework. For high beta low gas operational regime, density plays a critical role trend higher power is obtained at lower...
During the 2015-2016 JET campaigns many efforts have been devoted to exploration of high-performance plasma scenarios envisaged for DT operation in JET.In this paper we review various key recent hybrid discharges and model combined ICRF+NBI heating.These deuterium with beams had ICRF antenna frequency tuned match cyclotron minority H at centre tokamak coinciding second harmonic resonance D. The modelling takes into account synergy between NBI heating through D beam ions which allows us...
Dedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable. In these AUG discharges, energetic ions driving were obtained by ion (ICRH). It was found off-axis ECRH facilitated TAE instability, appearing and disappearing on timescales of a few milliseconds when the power switched off. On-axis had much weaker effect TAEs, co- counter-current...
Abstract This work studies the influence of radio frequency (RF) waves in ion cyclotron resonance heating (ICRH) range frequencies on fusion alphas during recent JET D-T campaign. Fusion from reactions are created with energies about 3.5 MeV and therefore have significant Doppler shifts enabling synergistic interactions between them RF at a broad frequencies, including ones foreseen for future machines ITER (Schneider et al 2021 Nucl. 61 126058) SPARC (Creely 2020 J. Plasma Phys. 86...
Abstract In the JET DTE2 campaign a new method was successfully tested to detect heating of bulk electrons by α-particles, using dynamic response electron temperature T e modulation ion cyclotron resonance (ICRH). A fundamental deuterium (D) ICRH scheme applied tritium-rich hybrid plasma with D-neutral beam injection (NBI). The i and accelerated deuterons leads modulated α -heating large delay respect other terms. significant phase ∼40° is measured between central , which can only be...
Abstract The required heating power, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>P</mml:mi> <mml:mi>LH</mml:mi> </mml:mrow> </mml:msub> </mml:math> , to access the high confinement regime (H-mode) in tritium containing plasmas is investigated JET with ITER-like wall at a toroidal magnetic field of <mml:mi>B</mml:mi> <mml:mi>t</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1.8</mml:mn> T and plasma current <mml:mi>I</mml:mi>...
This paper presents results of JET ITER-like wall L-mode experiments in hydrogen and deuterium (D) plasmas, dedicated to the study isotope dependence ion heat transport by determination critical gradient stiffness varying cyclotron resonance heating power deposition. When no strong role fast ions plasma core is expected, main difference between two plasmas determined edge behavior consistent with a gyro-Bohm scaling. (and pressure) increased, addition region, also shows substantial changes....
Abstract For more than a decade, an unprecedented predict-first activity has been carried in order to predict the fusion power and provide guidance second Deuterium–Tritium (D–T) campaign performed at JET 2021 (DTE2). Such provided framework for broad model validation development towards D–T operation. It is shown that it necessary go beyond projections using scaling laws obtain detailed physics based predictions. Furthermore, mixing different modelling complexity promoting extended...
Abstract The heating power to access the high confinement mode (H-mode), P LH , scales approximately inversely with isotope mass of main ion plasma species as found in (protonic) hydrogen, deuterium and tritium plasmas many fusion facilities over last decades. In first dedicated L–H transition experiments at Joint European Torus (JET) tokamak facility ITER-like wall (ILW), threshold, was studied systematically pure hydrogen–tritium mixtures a magnetic field 1.8 T current 1.7 MA order assess...
Ion cyclotron resonance heating (ICRH) plays an important role in high performance JET-ILW plasma discharges, both for keeping the heavy impurities away from centre as increasing core ion temperature to boost fusion performance. While former is needed all high-performance discharges steady state operation, latter will be particularly next-coming JET Deuterium-Tritium campaign (DTE2). Currently, workhorse impurity control power D plasmas fundamental H minority ICRH (with simultaneous ω=2ωc...
Combined ICRF and NBI heating played a key role in achieving the world-record fusion yield first deuterium-tritium campaign at JET tokamak 1997. The current plans for include new experiments with (D-T) plasmas more ITER-like conditions given recently installed wall (ILW). In 2015-2016 campaigns, significant efforts have been devoted to development of high-performance plasma scenarios compatible ILW preparation forthcoming D-T campaign. Good progress was made both inductive (baseline) hybrid...
Abstract Achieving high-performance conditions and maximizing the fusion yield of plasma discharges have been one main goals recent Joint European Torus (JET) campaigns in preparation for its second deuterium–tritium (D–T) campaign. The simulations shown this work delve into role external heating using neutral beam injection (NBI) radio-frequency waves ion cyclotron range frequencies (ICRF) order to optimise high performance JET tokamak. A baseline discharge with record neutron rate is used...
Abstract This work presents a study of the interaction between radio frequency (RF) waves used for ion cyclotron resonance heating and fast deuterium (D) tritium (T) neutral Beam injected (NBI) ions in DT plasma. The focus is on effects this interaction, also referred to as synergistic effects, fusion performance recent JET DTE2 campaign. Experimental data from dedicated pulses at 3.43 T/2.3 MA heated (i) 51.4 MHz, giving central minority H n = 2 D, (ii) 32.2 MHz 3 He T. Resonances are...