A5102755713- Magnetic confinement fusion research
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Enzyme Structure and Function
- Anaerobic Digestion and Biogas Production
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Pulsars and Gravitational Waves Research
- Fluid Dynamics and Turbulent Flows
- Advanced Materials Characterization Techniques
- Nitrogen and Sulfur Effects on Brassica
- Gamma-ray bursts and supernovae
- Quantum and electron transport phenomena
- Insurance and Financial Risk Management
- Earthquake Detection and Analysis
- Nanowire Synthesis and Applications
- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
- Diamond and Carbon-based Materials Research
- Ga2O3 and related materials
- High-Energy Particle Collisions Research
Columbia University
2020-2021
Royal Military Academy
2020
CEA Cadarache
2016-2018
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2018
Institut de Recherche sur la Fusion par Confinement Magnétique
2016-2018
Massachusetts Institute of Technology
1970
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...
The TCV tokamak is augmenting its unique historical capabilities (strong shaping, strong electron heating) with ion heating, additional heating compatible high densities, and variable divertor geometry, in a multifaceted upgrade program designed to broaden operational range without sacrificing fundamental flexibility. rooted three-pronged approach aimed at ITER support, explorations towards DEMO, research. A 1 MW, tangential neutral beam injector (NBI) was recently installed promptly...
Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat particle loads on wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research ASDEX Upgrade (AUG), MAST TCV. This multi-machine approach within EU-MST, covering wide parameter range, instrumental progress in field, as ITER DEMO core/pedestal SOL parameters are not achievable simultaneously present day devices. A two prong adopted. On one...
Recent experiments on the ASDEX Upgrade tokamak aim at improving physics base for ITER and DEMO to aid machine design prepare efficient operation. Type I edge localized mode (ELM) mitigation using resonant magnetic perturbations (RMPs) has been shown low pedestal collisionality . In contrast previous high ν* regime, suppression only occurs in a narrow RMP spectral window, indicating process, concomitant confinement drop is observed due reduction of top density electron temperature. Strong...
High fidelity kinetic plasma equilibrium reconstructions are an essential requirement for accurate stability and disruption prediction analyses to support continuous operation of high beta tokamak plasmas. The present plasmas in the KSTAR device include density temperature profiles from Thomson scattering ion charge exchange spectroscopy diagnostics, allowance fast particle pressure. In addition, up 25 channels motional Stark effect diagnostic data used constrain magnetic field pitch angle...
High-field galvanomagnetic effects have been investigated in the pyrite structure metallic compound Au${\mathrm{Sb}}_{2}$ fields up to 150 kG. The resistance ratios of samples [$\frac{\ensuremath{\rho}(295\ifmmode^\circ\else\textdegree\fi{}\mathrm{K})}{\ensuremath{\rho}(4.2\ifmmode^\circ\else\textdegree\fi{}\mathrm{K})}$] were as high 520. results indicate that is a compensated metal and its Fermi surface supports open orbits $〈100〉$, $〈110〉$, $〈112〉$ directions. At higher than about 50 kG,...
de Haas-van Alphen and Haas-Shubnikov oscillations were investigated in {100} {110} planes of the metallic compound Au${\mathrm{Sb}}_{2}$. The orientation dependence eight sets external Fermi-surface areas was determined. These frequencies ranged from about 8\ifmmode\times\else\texttimes\fi{}${10}^{4}$ G to 5\ifmmode\times\else\texttimes\fi{}${10}^{7}$ G. Where frequency cyclotron mass data for two experiments overlapped, agreement excellent. An attempt made compare field amplitude one set...
Compound sawteeth is studied with the XTOR-2F code. Non-linear full 3D magnetohydrodynamic simulations show that plasma hot core radially displaced and rotates during partial crash, but not fully expelled out of q = 1 surface. Partial crashes occur when radius surface exceeds a critical value, at fixed poloidal beta. This value depends on elongation. The crash time larger than collapse an ordinary sawtooth, likely due to weaker diamagnetic stabilization. suggests result from competition...
Measuring the value of safety factor (q) in core during sawtooth cycles is still an open issue. A new method to measure q Tore Supra plasma presented here. It relies on analysis time evolution a set MHD modes detected after crashes. These are frequency range previously observed Beta-induced Alfvén Eigenmodes, but with declining time. The mode shows that profile reversed when we have ICRH, crash. In high current discharges ( MA), q-profile remains for longer compared lower discharges....
Long-pulse plasma operation at high normalized beta, βN, above the n = 1 ideal MHD no-wall stability limit in KSTAR is presently limited by tearing instabilities rather than resistive wall modes. H-mode during recent device campaign produced discharges having strong m/n 2/1 βN lower beta limit. The unstable mode consequently reduced confinement and toroidal rotation significantly. experiment confirmed that an extended duration of electron cyclotron heating (ECH) initial phase discharge plays...
Sawteeth in tokamak plasmas correspond to periodic relaxations of the temperature and density central region plasma, caused by internal kink mode.They play an important role core confinement impurity transport a discharge, they can trigger secondary instabilities.Being able control their dynamics is therefore important.In this article, we explore means MHD simulations sawteeth, relying on current or power deposition vicinity q = 1 surface.To do so, with full-MHD code XTOR-2F [1], which...
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.
An undoped AlGaN/GaN nanowire displayed a transition at approximately 2V from Ohmic conduction low drain-source voltage to space charge limited high voltage. Growth of the metal seed manifests as triangular cross-section with one Ga-polar (0001) facet and two semi-polar {-110-1} facets. Conduction was based on polarization induced two-dimensional electron gas that formed interface. A simulation showed surface opposing field interface will distort reduce carrier concentration