A5100737782- Magnetic confinement fusion research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- High-Energy Particle Collisions Research
- Indoor Air Quality and Microbial Exposure
- Cold Fusion and Nuclear Reactions
- Odor and Emission Control Technologies
- Nuclear Materials and Properties
- Hydrogen Storage and Materials
- Atomic and Molecular Physics
- Quantum Dots Synthesis And Properties
- Quantum, superfluid, helium dynamics
- Laser-induced spectroscopy and plasma
- Anomaly Detection Techniques and Applications
- Fault Detection and Control Systems
- Environmental Impact and Sustainability
- Air Quality and Health Impacts
- Atomic and Subatomic Physics Research
- Graphene research and applications
- Nuclear Engineering Thermal-Hydraulics
Culham Science Centre
2013-2024
United Kingdom Atomic Energy Authority
2022-2024
Culham Centre for Fusion Energy
2012-2023
National Agency for New Technologies, Energy and Sustainable Economic Development
2021
Incheon National University
2021
Royal Military Academy
2020
Imperial College London
2012-2015
Waseda University
2013-2014
University of Ulsan
2012
This paper reports the progress made at JET-ILW on integrating requirements of reference ITER baseline scenario with normalized confinement factor 1, a pressure 1.8 together partially detached divertor whilst maintaining these conditions over many energy times. The 2.5 MA high triangularity ELMy H-modes are studied two different configurations D-gas injection and nitrogen seeding. power load reduction N seeding is reported. relationship between an increase in pedestal investigated....
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...
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 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...
This paper outlines an approach towards improved rigour in tokamak turbulence transport model validation within integrated modelling. Gaussian process regression (GPR) techniques were applied for profile fitting during the preparation of modelling simulations allowing rigourous sensitivity tests prescribed initial and boundary conditions as both fit derivative uncertainties are provided. was demonstrated by a JETTO simulation JET ITER-like-wall H-mode baseline discharge #92436 with QuaLiKiz...
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 Screening of high-Z (W) impurities from the confined plasma by temperature gradient at periphery fusion-grade H-mode plasmas has been demonstrated in JET-ILW (ITER-like wall) tokamak. Through careful optimisation hybrid-scenario, deuterium with sufficient heating power ( <?CDATA $\gtrsim$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>≳</mml:mo> </mml:math> 32 MW), high enough ion gradients pedestal top can be achieved for collisional,...
Abstract This work presents a model for predicting electron energy gain from cyclotron (EC) wave-particle interactions during the breakdown phase of tokamak pre-ionization. Investigation this to infer EC requirements inevitably demands high-fidelity simulation study covering gas physics, plasma dynamics, and absorption. Under significantly low density temperature, electrons interact nonlinearly with wave which picture is distinct linear or quasilinear heating. For room temperature electrons,...
Abstract In this paper, new models for a plasma burn-through simulation using the DYON code are introduced in detail, and quantitative validation of results against JET data is presented first time. order to calculate particle confinement time, dynamic effective connection length model including an eddy current effect used assuming ambipolar transonic transport Bohm diffusion parallel perpendicular losses, respectively. Plasma–surface interaction effects treated with impurity sputtering...
Three dimensionless scans in the normalized Larmor radius ρ*, collisionality ν* and plasma pressure β have been performed JET with ITER-like wall (JET-ILW).
This paper presents the transport analysis of high density baseline discharges in 2016 experimental campaign Joint European Torus with ITER-Like Wall (JET-ILW), where a significant increase deuterium–deuterium (D–D) fusion neutron rate (~2.8 × 1016 s−1) was achieved stable neutral beam injection (NBI) powers up to 28 MW and low gas puffing. Increase T i exceeding e were produced for first time despite electron density; this enabled thermal reaction rate. As result, new record performance...
A large-scale validation exercise was conducted to assess the multi-mode model (MMM) anomalous transport in integrated modeling code TRANSP. The included 6 EAST discharges, 17 KSTAR 72 JET ITER-like wall D-D and 4 DIII-D fusion plasma discharges. Using MMM, study computed thermal, particle, impurity, momentum within Simulations for EAST, KSTAR, focused on electron ion temperatures safety factor profiles, while simulations also considered density, toroidal rotation frequency, flow shear....
Abstract Although gas breakdown phenomena have been intensively studied over 100 years, the mechanism in a strongly magnetized system, such as tokamak, has still obscured due to complex electromagnetic topologies. There widespread misconception that conventional model of unmagnetized system can be directly applied system. However, we found clear evidence existing theories cannot explain experimental results. Here, demonstrate underlying tokamaks, turbulent ExB mixing avalanche, which...
Abstract Sustained operation of high-performance, ITER-baseline scenario plasmas at the high levels input power ( <?CDATA ${\lesssim}40\,\textrm{MW}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>≲</mml:mo> </mml:mrow> <mml:mn>40</mml:mn> <mml:mtext>MW</mml:mtext> </mml:math> ) required to achieve ∼15 MW D-T fusion in JET-ILW requires careful optimisation fuelling avoid an unacceptable disruption rate due excessive radiation, primarily from...
This paper presents the DYON simulations of plasma burn-through phase at Joint European Torus (JET) with ITER-like wall.The main purpose study is to validate wall, made beryllium.Without impurities, process a pure deuterium described using simulations, and criterion for derived analytically.The impurities are simulated wallsputtering models in code, which modified wall-sputtering validation against JET data presented.The impact assumed parameters discussed by means parameter scans.As result,...
Abstract We investigate conducting characteristics of biochar derived from the pyrolysis a paper at terahertz frequencies. Paper is annealed under temperatures ranging 600 to 1000 °C modify structural and electrical properties. experimentally observe that conductivity increases above 10 2 S/m as annealing temperature up 800 °C. From characterization using energy-dispersive X-ray spectroscopy, Fourier-transform infrared Raman diffraction, photoelectron we confirm more graphitic biochars are...
Abstract This paper describes the improvement of electromagnetic plasma burn-through model. Full circuit equations describing currents in solenoid, poloidal field coils, and toroidally conducting passive structures have been integrated into differential equation system energy particle balances DYON. enables consistent calculation time-evolving loop voltage at a position only using operation signals control room, which are current (or voltage) waveforms solenoid coils prefill gas pressure....
Exhaust power components due to ELMs, radiation and heat transport across the edge barrier (ETB) between ELMs are quantifed for H-mode plasmas in JET-C JET-ILW comparison with simulations of pedestal transport. In low-current, pulses a low rate gas fuelling, is found not be stiff, i.e. effective, mean diffusivity does increase electron temperature gradient parameter increases conducted loss pedestal, latter saturating at values . This partly relative reduction ion neo-classical (which more...
A consistent deterioration of global confinement in H-mode experiments has been observed JET [1] following the replacement all carbon plasma facing components (PFCs) with an metal ('ITER-like') wall (ILW). This correlated to degradation pedestal confinement, as lower electron temperature (Te) values are routinely measured at top edge barrier region. comparative investigation core heat transport JET-ILW and JET-CW (carbon wall) discharges performed, assess whether also affected by change.
This paper presents for the first time a statistical validation of predictive TRANSP simulations plasma temperature using two transport models, GLF23 and TGLF, over database 80 baseline H-mode discharges in JET-ILW. While accuracy predicted Te with TRANSP-GLF23 is affected by collisionality, dependency predictions on collisionality less significant when TRANSP-TGLF, indicating that latter model has broader applicability across regimes. TRANSP-TGLF also shows good matching Ti experimental...
Abstract An electron cyclotron heating (ECH) power absorption model was integrated with a plasma burn-through simulator, DYON, and the new version, DYON-EC, validated against KSTAR ECH-assist start-up experiments. The absorbed ECH calculated an analytic formula which is function of density temperature hardware settings, namely, injected power, wave frequency, harmonic number, mode fraction, beam injection angles. Wave parameter changes by wall reflection also included to simulate multiple...
Abstract For the first time, there was an extensive comparison between plasma burn-through modelling codes presently available—DYON, SCENPLINT, and BKD0. The code benchmarking carried out over three cases, adding more complexities in for each step. to revisit mathematical models codes. simulation results were compared with simplified settings, where ohmic of a pure hydrogen modelled ITER-relevant constant parameters. Without any reconciliation work, already predicted same threshold prefill...
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...