V. Aslanyan
A5041123785- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Fusion materials and technologies
- X-ray Diffraction in Crystallography
- Crystallography and Radiation Phenomena
- Laser-Matter Interactions and Applications
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Stellar, planetary, and galactic studies
- Particle accelerators and beam dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Laser Material Processing Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Dust and Plasma Wave Phenomena
- Plasma Diagnostics and Applications
- High-pressure geophysics and materials
- Advanced X-ray and CT Imaging
- High-Energy Particle Collisions Research
Fusion Academy
2022-2024
Fusion (United States)
2022-2024
Plasma Technology (United States)
2017-2024
University of Dundee
2021-2024
University of Leicester
2019-2020
Royal Military Academy
2020
IIT@MIT
2017-2019
University of York
2013-2019
Culham Science Centre
2017-2019
Oak Ridge National Laboratory
2017
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...
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...
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...
The objective of thermonuclear fusion consists producing electricity from the coalescence light nuclei in high temperature plasmas. most promising route to envisages confinement such plasmas with magnetic fields, whose studied configuration is tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one main potential showstoppers on a commercial reactor. In this work we report how, deploying innovative analysis methods thousands JET experiments covering isotopic...
In DT plasmas, toroidal Alfvén eigenmodes (TAEs) can be made unstable by the alpha particles resulting from fusion reactions, and may induce a significant redistribution of fast ions. Recent experiments have been conducted in JET deuterium plasmas order to prepare scenarios aimed at observing alpha-driven TAEs future campaign. Discharges low density, large core temperatures associated with presence internal transport barriers characterised good energetic ion confinement performed. ICRH has...
Abstract We present an overview of results from a magnetofrictional model the entire solar corona over period 47 yr. The simulation self-consistently reproduces decades phenomena, varying in duration between rapid eruptions and long-term cycles, input observed active regions emerging at photosphere. have developed geometric approach to use magnetic helicity identify localize frequent that occur simulation. This method allows us match our extreme-ultraviolet observations transient events....
Parker Solar Probe's (PSP) discovery of the prevalence switchbacks (SBs), localised magnetic deflections in nascent solar wind, has sparked interest uncovering their origins. A prominent theory suggests these SBs originate lower corona through reconnection processes, closely linked to jet phenomena. Jets are impulsive events, observed across scales and atmosphere layers, associated with release twist helicity. This study examines whether self-consistent jets can form propagate into...
Advanced mesoscale devices require tight tolerances of very fine features. Laser ablation is widely used for this purpose, and extreme-ultraviolet (EUV) lasers in particular allow a tighter focus lower-temperature machining than traditional lasers. The authors perform simulations experiments laser using an EUV laser, producing high-aspect-ratio (100 nm---1\textmu{}m) features with high level control over the profile. This work provides effective technique to investigate promote...
The interaction of an extreme ultraviolet (EUV) laser beam with a parylene foil was studied by experiments and simulation. A single EUV pulse nanosecond duration focused to intensity 3 × 1010 W cm−2 perforated micrometer thick targets. same simultaneously used diagnose the transmission measurement. combination 2-dimensional radiation-hydrodynamic diffraction calculations model ablation, leading good agreement experiment. This theoretical approach allows predictive modelling matter intense...
We recast the atomic processes in a warm, dense plasma using Fermi-Dirac statistics and compare them to rates of usual Maxwell-Boltzmann approach many collisional-radiative models. Population calculations show insignificant differences assuming nondegenerate free electrons plasmas at solid density close local thermodynamic equilibrium, but departures average ionization presence strong photoionization. For example, we that electron degeneracy affects evolution created by ultraviolet laser...
Emission spectra and the dynamics of high energy density plasmas created by optical Free Electron Lasers (FELs) depend on populations atomic levels. Calculations plasma emission ionization may be simplified assuming Local Thermodynamic Equilibrium (LTE), where are given Saha-Boltzmann equation. LTE can achieved at densities when collisional processes much more significant than radiative processes, but not valid if conditions change rapidly. A collisional-radiative model has been used to...
Abstract Interchange reconnection has been proposed as a mechanism for the generation of slow solar wind, and key contributor to determining its characteristic qualities. In this paper we study implications interchange structure plasma field in heliosphere. We use Adaptively Refined Magnetohydrodynamic Solver simulate coronal magnetic evolution topology containing both pseudostreamer helmet streamer. begin with geometry low-latitude hole that is separated from main polar by pseudostreamer....
The excitation of modes in the toroidal Alfvén eigenmodes (TAE) gap by an external antenna can be modelled a driven damped harmonic oscillator. By performing frequency scan it is possible to determine damping rate mode through quality factor. This method has been employed recent Joint European Torus (JET) experiments dedicated scenario development for observation alpha-driven instabilities JET DT plasmas (i.e. composed Deuterium and Tritium). However, number n which measurements were...
The gyrokinetic toroidal code (GTC) has been used to study Alfvén eigenmodes (TAEs) in high-performance plasmas. Experiments performed at the Joint European Torus (JET), where TAEs were driven by energetic particles arising from neutral beams, ion cyclotron resonant heating, and resonantly excited dedicated external antennas, have simulated. Modes populations of are observed, matching TAE frequency seen with magnetic probes JET experiments. A synthetic antenna, composed one two neighboring...
Micropore optics have recently been implemented in a lobster eye geometry as compact X-ray telescope. Fields generated by rare-earth magnets are used to reduce the flux of energetic electrons incident upon focal plane detector such setup. We present design and implementation electron diverters for telescopes two upcoming missions: microchannel telescope onboard space-based multiband astronomical variable objects monitor soft instrument solar wind magnetosphere ionosphere link explorer....
Abstract The slow solar wind is generally believed to result from the interaction of open and closed coronal magnetic flux at streamers pseudostreamers. We use three-dimensional magnetohydrodynamic simulations determine detailed structure dynamics open-closed interactions that are driven by photospheric convective flows. field model includes a global dipole giving rise streamer together with large parasitic polarity region pseudostreamer separates satellite hole main polar hole. Our...
Abstract The boundaries of solar coronal holes are difficult to uniquely define observationally but sites interest in part because the slow wind appears originate there. aim this article is explore dynamics interchange magnetic reconnection at different types hole boundaries—namely streamers and pseudostreamers—and their implications for structure. We describe synthetic observables derived from three-dimensional magnetohydrodynamic simulations atmosphere Sun which disturbed by flows that...
A nonlinear bump-on-tail model for the growth and saturation of energetic particle driven plasma waves has been extended to include two populations fast particles—one dominated by dynamical friction at resonance other velocity space diffusion. The resulting temporal evolution wave amplitude frequency depends on relative weight populations. species is applied burning with drag-dominated alpha particles diffusion-dominated ICRH accelerated minority ions, showing stabilization bursting modes....
The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a Chinese – French satellite mission due to be launched in the summer of 2022. It composed four instruments: ECLAIRs, for detecting X-ray and gamma-ray transients (4-250 keV); GRM, spectrometer (15 keV-5 MeV); VT, visible telescope Microchannel Telescope (MXT). MXT's main goal precisely localize, spectrally characterize afterglows Gamma-Ray Bursts. MXT narrow-field-optimised lobster eye focusing comprising an array 25...
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.
A comprehensive simulation study is presented, examining the interaction of an EUV capillary discharge laser, operating at 46.9nm, within carbon solid density. By incorporating a detailed model photoionization, equation state calculations, electronic term accounting and refractive index calculation into pre-existing 2D radiative-hydrodynamic code POLLUX, target ablation subsequent plasma expansion has been simulated for material under intense (10<sup>11</sup> W cm<sup>-2</sup>) irradiation....