A5054340730- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- X-ray Diffraction in Crystallography
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Carbon Nanotubes in Composites
- Nuclear Materials and Properties
- Glass properties and applications
- Crystallography and Radiation Phenomena
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Meteorological Phenomena and Simulations
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Metal and Thin Film Mechanics
- Medical Imaging Techniques and Applications
- Theoretical and Computational Physics
- Particle accelerators and beam dynamics
- Thin-Film Transistor Technologies
- Electromagnetic Launch and Propulsion Technology
Kurchatov Institute
2015-2024
Bauman Moscow State Technical University
2024
Plasma (Russia)
2023
Royal Military Academy
2020
Abstract The Monte-Carlo code ERO2.0 was used to simulate steady-state erosion and transport of beryllium (Be) in the ITER main chamber. Various plasma scenarios were tested, including a variation species (hydrogen, deuterium, helium), conditions (density, temperature, flow velocity) magnetic configurations. study provides valuable predictions for Be divertor, where it is expected be an important contributor dust formation fuel retention due build-up co-deposited layers. gross net rates...
The data of the Hα high-resolution spectroscopy, collected on multiple lines sight, which cover entire divertor space in poloidal cross-section, during recent hydrogen-deuterium experiments JET-ILW (ITER-like wall), are processed. A strong spatial inhomogeneity hydrogen concentration, H/(H + D), is found many pulses. Namely, D) ratio may be lower inner than that outer by values 0.15–0.35, depending conditions gas puffing and plasma heating. This effect suggests necessity spatially-resolved...
Abstract A sequence of fuel recovery methods was tested in JET, equipped with the ITER-like beryllium main chamber wall and tungsten divertor, to reduce plasma deuterium concentration less than 1% preparation for operation tritium. This also a key activity regard refining clean-up strategy be implemented at end 2nd DT campaign JET (DTE2) assess tools that are envisaged mitigate tritium inventory build-up ITER. The began 4 days baking 320 °C, followed by further which Ion Cyclotron Wall...
The use of an all-metal first wall in future magnetic fusion reactors equipped with a divertor may impose severe limitations on the capabilities optical diagnostics main chamber because stray light (DSL) produced by reflections intense emitted divertor. Here, we introduce synthetic H-alpha to estimate errors solutions inverse problems aimed at recovering neutral hydrogen parameters (density and isotope ratio) scrape-off layer (SOL) allowance for (a) strong DSL observation chords chamber, (b)...
Abstract ERO2.0 is a recently developed Monte‐Carlo code for modelling global erosion and redeposition in fusion devices. We report here on the code's application to ITER studying of beryllium (Be) first wall armour under burning plasma steady state diverted conditions. An important goal study provide synthetic signals design two key diagnostics: main chamber visible spectroscopy laser in‐vessel viewing systems. The simulations are performed using toroidally symmetric backgrounds obtained by...
Abstract The theoretical model suggested for ITER main chamber H α spectroscopy is applied to the high-resolution (HRS) data of recent JET ITER-like wall (ILW) experiments. aimed at reconstructing neutral hydrogen isotope density in SOL, as well ratio, by solving a multi-parametric inverse problem with allowance (i) strong divertor stray light (DSL) on main-chamber lines sight (LoS), (ii) substantial deviation atom velocity distribution function (VDF) from Maxwellian and (iii) direct...
The problems related to the spectral line-shape formation in scrape of layer (SOL) fusion reactor plasma for typical observation chords are considered. SOL is characterized by relatively low electron density (1012–1013 cm−3) and high temperature (from 10 eV up 1 keV). main effects responsible Doppler Zeeman effects. problem a correct modeling neutral atom velocity distribution function (VDF). VDF determined number atomic processes, namely: molecular dissociation, ionization charge exchange...
Abstract A tomographic method for reconstructing the axially symmetric D α emission profile in ITER scrape-off layer and divertor from intensity measurements fields of view (FoV) Vis/IR TV Divertor Impurity Monitor diagnostics is under development. The takes into account strong background signal due to stray light produced by reflections metal wall vacuum chamber. allows filter out signals measured main accuracy this tested within framework a synthetic diagnostic, which uses Raysect Cherab...
Abstract A new method for estimating the global erosion of beryllium (Be) in ITER is proposed. The uses raytracing-aided tomography to reconstruct three-dimensional (3D) profile visible-light emissivity boundary plasma from images captured with filtered cameras VIS/IR wide angle viewing system, H-alpha (and Visible) Spectroscopy diagnostics and signals collected Divertor Impurity Monitor. light reflected into detectors metallic plasma-facing components (PFCs) out process. reconstructed Be...
XaNSoNS is an open source software with GPU support, which simulates X-ray and neutron 1D (or 2D) diffraction patterns pair-distribution functions (PDF) for amorphous or crystalline nanoparticles (up to ∼107 atoms) of heterogeneous structural content. Among the multiple parameters structure user may specify atomic displacements, site occupancies, molecular displacements rotations. The uses general equations nonspecific structures calculate scattering intensity. It supports four major...
The present study addresses the uncertainties that affect recently performed predictions of beryllium (Be) erosion and migration in ITER using Monte-Carlo code ERO2.0. focus is a D–T baseline discharge with fusion power gain Q=10, scrape-off layer (SOL) input PSOL=100MW, toroidal plasma current Ip=15MA, central field Bt=5.3T. parameter studies used to investigate include variations radial extrapolation parameters far-SOL (scan A), assumptions on impact angle distributions B) anomalous...
The reflection of light from walls will result in parasitic signals for various optical diagnostics and can be a serious issue ITER. In this study, we show recent progress the assessment effects wall reflections ITER based on ray tracing simulation results. Four different were chosen simulation, i.e. visible spectroscopy, infrared thermography, edge laser Thomson scattering, charge exchange recombination spectroscopy.
A parameterization of the Balmer-alpha spectral line shape asymmetry in tokamak scrape-off layer (SOL) plasmas is suggested, which describes contribution nonMaxwellian components neutral atom velocity distribution function. Parameterization needed for a fast-routine interpretation high-resolution spectroscopy data and should be incorporated into algorithms recovery hydrogen parameters SOL. We illustrate efficiency on example calculated using predictive modeling International Thermonuclear...
We report on the first results for spectrum of divertor stray light (DSL) and signal-to-background ratio D-α emitted from far SOL in JET recent ITER-like wall (ILW) campaign. The support expectation a strong impact DSL upon H-alpha (and Visible Light) Spectroscopy Diagnostic ITER.
The computer tomography for divertor impurity monitor, which measures plasma emissions in the region, ITER has been conducted using a ray-tracing technique. We have attempted four different solution methods inversion problem and compared results. minimize errors logarithmic scale had better performance than linear scale. This is likely due to fact that values emission profile vary wide range of orders magnitude. accuracy reconstruction investigated by changing discharge conditions number...
The accuracy of approximate automodel solutions for the Green’s function Biberman-Holstein equation Stark broadening spectral lines is analyzed using distributed computing. high in a wide range parameters problem shown.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation K. Yu. Vukolov, I. Orlovskiy, A. G. Alekseev, Borisov, E. N. Andreenko, B. Kukushkin, V. S. Lisitsa, Neverov; Main challenges for ITER optical diagnostics. AIP Conf. Proc. 21 August 2014; 1612 (1): 164–170. https://doi.org/10.1063/1.4894046 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
Abstract A statistical analysis is carried out of the similarity profiles plasma parameters: electron temperature T e , density n and pressure P at stage quasi-stationary current (the so called flat-top stage) about 9000 discharges in JET tokamak, among from #84458 to #99419 that covers almost entire database successful ITER-like wall machine. For all these parameters, existence universal shown as functions normalized minor radius column ρ . The discharge (DUPs) are obtained by dividing...
Radiative transfer (RT) in spectral lines plasmas and gases under complete redistribution of the photon frequency emission-absorption act is known as a superdiffusion transport characterized by irreducibility integral (in space coordinates) equation for atomic excitation density to diffusion-type differential equation. The dominant role distant rare flights (Lévy flights, introduced Mandelbrot trajectories generated Lévy stable distribution) well used construct approximate analytic solutions...
An algorithm is developed for structure identification of amorphous carbonaceous nanomaterials with a joint x-ray and neutron diffraction data analysis, using the on chemical composition sample from other diagnostics. The an extension one formerly diagnostics similar ([1] Chem. Phys. Lett., 506, 265-268 (2011)). tested example processing computed which models fragment hydrocarbon films analyzed in [1]. interest materials comparable atomic fractions carbon hydrogen.