Ö. Asztalos
A5075462118- Magnetic confinement fusion research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Ionosphere and magnetosphere dynamics
- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Advancements in Photolithography Techniques
- Gas Sensing Nanomaterials and Sensors
- Fluid Dynamics and Turbulent Flows
- Machine Learning and ELM
- Electrostatic Discharge in Electronics
- Electronic Packaging and Soldering Technologies
- Geomagnetism and Paleomagnetism Studies
- Electron and X-Ray Spectroscopy Techniques
- Gas Dynamics and Kinetic Theory
- Particle Accelerators and Free-Electron Lasers
- Integrated Circuits and Semiconductor Failure Analysis
- Magnetic properties of thin films
- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Computational Fluid Dynamics and Aerodynamics
HUN-REN Centre for Energy Research
2021-2024
Budapest University of Technology and Economics
2017-2024
Culham Science Centre
2024
Culham Centre for Fusion Energy
2024
HUN-REN Wigner Research Centre for Physics
2019
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...
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...
Abstract Motional Stark effect (MSE) measurements have been useful for characterizing the magnetic field structure in several tokamaks over past decades. The splitting emission spectrum of injected high-energy neutrals carries information about both strength and direction, although only directional is extracted most measurements. There are codes capable simulating emitted by neutral beams with MSE included, aiding design utilization beam spectroscopy (BES) or diagnostic systems. In this...
Abstract The injection of energetic neutral particles into the plasma magnetic confinement fusion reactors is a widely-accepted method for heating such plasmas; various types beam are also used diagnostic purposes. Accurate atomic data required to properly model penetration and interpret photoemission spectra from both themselves (e.g. emission spectroscopy) impurities with which they interact charge exchange recombination spectroscopy). This paper reviews compares theoretical methods...
A diagnostic instrument is described for the Experimental Advanced Superconducting Tokamak (EAST) measurement of edge plasma electron density profile and turbulence properties. An accelerated neutral lithium beam injected into tokamak Doppler shifted 670.8 nm light emission Li2p-2s transition detected. novel compact setup used, where injection observation take place from same equatorial port radial-poloidal resolution achieved with microsecond time resolution. The direction optimized in...
Diagnosing the density profile at edge of high temperature fusion plasmas by an accelerated lithium beam is a known technique since decades. By knowledge relevant atomic physics rate coefficients, plasma electron can be calculated from relatively calibrated light along beam. Several additional possibilities have already been demonstrated: Charge Exchange Resonance Spectroscopy (CXRS) for ion temperature/flow and Zeeman polarimetry current; therefore Li-beam diagnostic offers wealth...
The JT-60SA tokamak, being built under the Broader Approach agreement jointly by Europe and Japan, is due to start operation in 2020 expected give substantial contributions both ITER DEMO scenario optimisation. A broad set of preparation activities for an efficient experiments on carried out, involving elaboration Research Plan, advanced modelling various domains, feasibility conception studies diagnostics other sub-systems connection with priorities scientific programme, development...
An H-mode plasma state free of edge-localized mode (ELM), close to the L-H transition with clear density and temperature pedestal has been observed both at Joint European Torus (JET) ASDEX Upgrade (AUG) tokamaks usually identified by a low frequency (LFO, 1-2 kHz), m=1, n=0 oscillation magnetics modulation profiles. The regime JET is referred as M-mode while AUG intermediate phase or I-phase. This contribution aims comparative analysis these phenomena in terms properties, magnetic...
The interaction between two ground state hydrogen atoms in a collision was studied using the four-body classical trajectory Monte Carlo method. We present total cross sections for dominant channels, namely single ionization of target, projectile, resulting from pure ionization, and also electron transfer (capture or loss) processes. complete break system, final channel four free particles. calculations were carried out at low energies, relevant to interest fusion research. our projectile...
The scrape off layer (SOL) plasma in a Tokamak device and its coupling with the edge dictate performance of discharge to high degree—especially as all has go through SOL, which is main exhaust channel for hot plasma. This contribution provides an introduction modelling efforts dynamics SOL regions. We employ fully dynamical fluid model, HESEL code. equipped synthetic diagnostic tools probe arrays, Li-beam spectroscopy, Gas Puff Imaging. Using arrays measure electron ion heat advection...
The JT-60SA superconducting tokamak is proposed to be equipped with a Lithium Beam Emission Spectroscopy (LiBES) and Deuterium (DBES) diagnostic systems. purpose of the LiBES system scrape-off layer (SOL) plasma edge density profile measurements fluctuation in SOL outer regions, whereas DBES on heating beam would have capacity core as well. Considerations for an optimal require sufficient penetration beyond separatrix reasonable amount emission collected by optical system, while mostly...
Understanding fast pedestal dynamics and turbulent transport in the edge scrape-off layer (SOL) plasma of spherical tokamaks is crucial for design operation future fusion reactors. The alkali beam emission spectroscopy diagnostic technique offers a means to measure absolute electron density radial profile fluctuation amplitude these regions. In this study, we demonstrate that injecting sodium neutral radially into analyzing light from its 3p–3s atomic transition using near-orthogonal viewing...
The collisional radiative models used in the modeling of beam emission spectroscopy diagnostics neglect atom–atom collisions because a lack sufficiently detailed atomic data. Filling this scantiness we performed classical trajectory Monte Carlo simulations to calculate cross sections for various channels between H + H2 and Li wide range projectile energies. Based on calculated sections, simplified version model has been derived. We show that is suitable obtain attenuation neutral gases...
A method is presented for the swift reconstruction of electron density profiles measured by alkali beam emission spectroscopy. It based on linearization governing rate equations and leads to a direct calculation obtaining profiles. The uncertainties measurement are incorporated into problem through utilization Tikhonov regularization generalized least squares method. An approximation uncertainty reconstructed data calculated as well. applicability tested against both simulated real...
Beam emission spectroscopy (BES) is a powerful plasma diagnostic method especially suited for the measurement of density and its fluctuations. As such, synthetic BES codes are regularly used to aid design or utilization these systems. However, diagnostics can also be study in previously not yet explored operational conditions. This paper presents such an analysis utilizing RENATE-OD code hypothetical alkali system on HSX stellarator. device featuring unusual operating regime world fusion...
Beam emission spectroscopy (BES) is an active plasma diagnostic utilized for density measurements. BES synthetic diagnostics are computationally expensive and comprehensive modelling suites designed to provide a better understanding of the diagnostics' perception underlying phenomena. RENATE-OD advanced relying on rate-equation solver derive beam given input profiles. In this work, linear regression, multi-layer perceptron extreme learning machines were explored as substitute predict...