A5030017826- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Model Reduction and Neural Networks
- Computational Fluid Dynamics and Aerodynamics
- Neural Networks and Applications
- Nuclear Physics and Applications
- Lattice Boltzmann Simulation Studies
- Probabilistic and Robust Engineering Design
- Advanced Numerical Methods in Computational Mathematics
- Advancements in Semiconductor Devices and Circuit Design
- Meteorological Phenomena and Simulations
- Scientific Computing and Data Management
- Fault Detection and Control Systems
- Laser-induced spectroscopy and plasma
- Advanced Data Storage Technologies
- Generative Adversarial Networks and Image Synthesis
- Distributed and Parallel Computing Systems
- Nuclear Engineering Thermal-Hydraulics
United Kingdom Atomic Energy Authority
2020-2025
Culham Science Centre
2015-2024
Culham Centre for Fusion Energy
2014-2024
Fusion (United States)
2019
Fusion Academy
2019
Max Planck Society
2017
Max Planck Institute for Plasma Physics
2015-2017
Japan External Trade Organization
2015-2016
CEA Cadarache
2008-2015
Forschungszentrum Jülich
2015
JOREK is a massively parallel fully implicit non-linear extended MHD code for realistic tokamak X-point plasmas. It has become widely used versatile studying large-scale plasma instabilities and their control developed in an international community. This article gives comprehensive overview of the physics models implemented, numerical methods applied solving equations studies performed with code. A dedicated section highlights some verification work done hierarchy different available...
Non-linear MHD simulations of edge localized modes (ELMs) show features in qualitative agreement with the experimental observations such as formation and speed filaments, radial profiles fine structure observed power deposition at divertor target. The density perturbation predominantly follows ballooning mode convection cells leading to filaments. temperature perturbation, due large parallel conduction, magnetic field perturbation. Simulations pellets injected H-mode pedestal that high...
The interaction of static Resonant Magnetic Perturbations (RMPs) with the plasma flows is modeled in toroidal geometry, using non-linear resistive MHD code JOREK, which includes X-point and scrape-off-layer. Two-fluid diamagnetic effects, neoclassical poloidal friction a source rotation are introduced model to describe realistic flows. RMP penetration studied taking self-consistently into account effects these radial electric field evolution. JET-like, MAST, ITER parameters used modeling....
Abstract Predicting plasma evolution within a Tokamak reactor is crucial to realizing the goal of sustainable fusion. Capabilities in forecasting spatio-temporal rapidly and accurately allow us quickly iterate over design control strategies on current devices future reactors. Modelling using numerical solvers often expensive, consuming many hours supercomputers, hence, we need alternative inexpensive surrogate models. We demonstrate accurate predictions both simulation experimental domains...
A possible mechanism of edge localized modes (ELMs) mitigation by resonant magnetic perturbations (RMPs) is proposed based on the results nonlinear resistive magnetohydrodynamic modeling using jorek code, realistic JET-like plasma parameters and an RMP spectrum JET error-field correction coils (EFCC) with a main toroidal number n=2 were used in simulations. Without RMPs, large ELM relaxation obtained mainly due to most unstable medium-n ballooning mode. The externally imposed drives...
Abstract The plasma response to resonant magnetic perturbations (RMPs) in ASDEX Upgrade is modeled with the non-linear resistive MHD code JOREK, using input profiles that match those of experiments as closely possible. RMP configuration for which edge localized modes are best mitigated related largest kink observed near X-point modeling. On surfaces q = m / n , coupling between component ( > nq ) and found induce amplification perturbation. ergodicity 3D-displacement induced by can only...
Abstract Model-based plasma scenario development lies at the heart of design and operation future fusion powerplants. Including turbulent transport in integrated models is essential for delivering a successful roadmap towards ITER DEMO-class devices. Given highly iterative nature models, fast machine-learning-based surrogates are fundamental to fulfil pressing need faster simulations opening up pulse design, optimization, flight simulator applications. A significant bottleneck generation...
Abstract ITER is of key importance in the European fusion roadmap as it aims to prove scientific and technological feasibility a future energy source. The EUROfusion consortium labs within Europe contributing preparation exploitation operation aspires exploit outcomes view DEMO. paper provides an overview major progress obtained recently, carried out frame new (initiated 2021) work-package called ‘ Pr eparation I TER O peration’ (PrIO). directly supported by eleven PrIO contributions given...
2019) 076038 (17pp) (mainly ETG and ITG) by 50%.This suggests that, in these plasmas, the increase turbulent transport due to outward shift of density might play an important role decrease pedestal performance.
For the design and operation of large fusion devices a detailed understanding power exhaust processes is necessary.This paper will give an overview current research on divertor load mechanisms.The results shown are obtained in JET with ITER like wall ASDEX Upgrade tungsten coated plasma facing components.The challenges infrared thermography bulk presented.For steady state heat load, fall-off length λ q JET-ILW compared to empirical scaling found carbon components.A first attempt scale...
JOREK 3D non-linear MHD simulations of a D2 Massive Gas Injection (MGI) triggered disruption in JET are presented and compared detail to experimental data. The MGI creates an overdensity that rapidly expands the direction parallel magnetic field. It also causes growth islands (m/n=2/1 3/2 mainly) seeds 1/1 internal kink mode. O-points all island chains (including 1/1) located front MGI, consistently with observations. A burst activity peak plasma current take place at same time as...
The mega amp spherical tokamak (MAST) was a low aspect ratio device (R/a = 0.85/0.65 ~ 1.3) with similar poloidal cross-section to other medium-size tokamaks. physics programme concentrates on addressing key issues for the operation of ITER, design DEMO and future tokamaks by utilising high resolution diagnostic measurements closely coupled theory modelling significantly advance our understanding. An empirical scaling energy confinement time that favours higher power, lower collisionality...
Abstract A reduction of the pedestal pressure with increasing separatrix density over ( n e sep / ped ) has been observed in JET. The physics behind this correlation is investigated. due to two distinct mechanisms. increase till ≈0.4 shifts radially outwards, decreasing peeling-balloning stability and reducing height. effect position saturates above ≈ 0.4. For higher values, ascribed increased turbulent transport and, likely, resistive MHD effects. reduces ∇ /n , η transport. This gradient...
Abstract Edge localized modes (ELMs) suppression by resonant magnetic perturbations (RMPs) was studied with the non-linear magneto-hydro-dynamic (MHD) code JOREK for ITER H-mode scenarios at 15 MA, 12.5 10 MA/5.3 T. The main aim of this work to demonstrate that ELMs can be suppressed RMPs while divertor 3D footprints heat and particle fluxes remain within material limits. unstable peeling–ballooning responsible without were modelled first each scenario using numerically accessible parameters...
Neural PDEs offer efficient alternatives to computationally expensive numerical PDE solvers for simulating complex physical systems. However, their lack of robust uncertainty quantification (UQ) limits deployment in critical applications. We introduce a model-agnostic, physics-informed conformal prediction (CP) framework that provides guaranteed estimates without requiring labelled data. By utilising physics-based approach, we are able quantify and calibrate the model's inconsistencies with...
Nuclear fusion plays a pivotal role in the quest for reliable and sustainable energy production. A major roadblock to achieving commercially viable power is understanding plasma turbulence, which can significantly degrade confinement. Modelling turbulence crucial design performing scenarios next-generation reactor-class devices current experimental machines. The nonlinear gyrokinetic equation underpinning modelling evolves 5D distribution function over time. Solving this numerically...
This paper discusses the NVIDIA Omniverse platform for visualizing and integrating digital twins of fusion power plants, focusing on enhancing design, simulation, operational workflows complex systems. As global projects such as ITER, STEP, CFETR move toward realizing practical energy, sophisticated tools to model, simulate, optimize systems become increasingly critical. Digital are virtual replicas physical that act a “single source truth” by scientific analysis, engineering real-time data...
The research and development of fusion energy technology is becoming increasingly complex involving large amounts diverse data like engineering CAD models, multi-physics simulations, AI-based diagnostics. Such diversity multi-modality necessitate the creation advanced visualisation systems for improved integration, accessibility, usability. This study explores adaptation techniques to through three core domains: (1) efficient analysis instinctive exploration heterogeneous datasets; (2)...
The type I ELMy H-mode is the baseline operating scenario for ITER. While it known that edge-localized mode (ELM) ultimately results from peeling–ballooning instability, there growing experimental evidence a grows up before ELM crash may modify edge plasma, which then leads to event due mode. triggered in release of large number particles and energy core plasma but precise mechanism by these losses occur still not fully understood hence makes predictions future devices uncertain. Recent...
Recent measurements of microwave and x-ray emission during edge localized mode (ELM) activity in tokamak plasmas provide a fresh perspective on ELM physics. It is evident that electron kinetics, which are not incorporated standard (fluid) models for the instability drives ELMs, play key role new observations. These effects should be included future ELMs cycle. The observed radiative paradoxically imply acceleration electrons parallel to magnetic field combined with rapid acquisition...
The pedestal structure of type I ELMy H-modes has been analysed for JET-ILW.The electron pressure width is independent ρ* and increases proportionally to √β pol,PED .Additional broadening the observed, at constant β , with increasing ν* and/or neutral gas injection contribution atomic physics effects in setting cannot as yet be ruled out.Neutral penetration alone does not determine shape edge density profile ratio temperature scale lengths transport barrier region, η e order 1.5-2.The...
Non-linear magnetohydrodynamic (MHD) simulations play an essential role in active research and understanding of tokamak plasmas for the realization a fusion power plant. The development MHD codes such as JOREK is key aspect this effort. In paper, we present operational version full-MHD model implemented JOREK, significant advancement from reduced-MHD used previous studies, where assumptions were made on perpendicular dynamics toroidal magnetic field. final presented detail, benchmarks are...
The interaction between Edge-Localized Modes (ELMs) and Resonant Magnetic Perturbations (RMPs) is modeled with the magnetohydrodynamic code JOREK using experimental parameters from ASDEX Upgrade discharges. According to modeling, ELM mitigation or suppression optimal when amplification of both tearing peeling-kink responses results in a better RMP penetration. not only due reduction pressure gradient but predominantly arises toroidal coupling ELMs RMP-induced mode at plasma edge, forcing...
Physics-Informed Neural Networks have shown unique utility in parameterising the solution of a well-defined partial differential equation using automatic differentiation and residual losses. Though they provide theoretical guarantees convergence, practice required training regimes tend to be exacting demanding. Through course this paper, we take deep dive into understanding loss landscapes associated with PINN how that offers some insight as why PINNs are fundamentally hard optimise for. We...