M. Iliasova
A5027928359- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Fusion materials and technologies
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Particle physics theoretical and experimental studies
- Fault Detection and Control Systems
- Radioactive contamination and transfer
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Atomic and Molecular Physics
- High-Energy Particle Collisions Research
- Anomaly Detection Techniques and Applications
- Isotope Analysis in Ecology
- Plasma Diagnostics and Applications
Ioffe Institute
2016-2025
Max Planck Institute for Plasma Physics
2024
Physico-Technical Institute
2022-2024
Plasma (Russia)
2023
Abstract ST40 is a compact, high-field ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>B</mml:mi> <mml:mi mathvariant="normal">T</mml:mi> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> <mml:mtext>⩽</mml:mtext> <mml:mn>2.1</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mtext>T</mml:mtext> </mml:math> ) spherical tokamak (ST) with mission to expand the physics and technology basis for ST route commercial fusion. The research programme covers...
Dedicated experiments to generate energetic D ions and fusion-born alpha particles were performed at the Joint European Torus (JET) with ITER-like wall (ILW). Using 3-ion radio frequency (RF) heating scenario, deuterium from neutral beam injection (NBI) accelerated in core of mixed plasmas higher energies ion cyclotron resonance (ICRF) waves, turn leading a core-localized source particles. The fast-ion distribution RF-accelerated D-NBI was controlled by varying ICRF NBI power ( 4–6 MW, 3–20...
The paper provides an overview of the results obtained on spherical tokamak Globus-M2 in 2019–2020. experiments were performed with toroidal magnetic field up to 0.8 T and plasma current 0.4 MA (80% design values). temperature electrons 1 keV ions 800 eV at density 1020 m−3 recorded neutral beam injection (850 kW, 28.5 keV). Heat conductivity analysis was made by means codes ASTRA 7.0, NCLASS, SPIDER, NUBEAM, 3D fast ion tracking algorithm basis experimental data. A scaling for tokamaks,...
Abstract NBI-assisted plasma heating with one or two injectors of fast neutral atoms was studied at the Globus-M2 spherical tokamak toroidal magnetic fields 0.8–0.9 T and currents 0.35–0.4 MA. Measurements spatial temperature electron density distributions, performed using Thomson scattering diagnostics, showed a twofold increase in electrons during injection particles energies up to 45 keV beam power 0.75 MW, as compared ohmic regime. Switching on second additional particle energy 30 0.5 MW...
Abstract The fusion reaction between deuterium and tritium, D ( T,n ) 4 He is the main source of energy in future thermonuclear reactors. Alpha-particles -ions) born with an average 3.5 MeV transferring to thermal plasma during their slowing down, should provide self-sustained D–T burn. adequate confinement α -particles essential efficient heating bulk steady burning a reactor plasma. That why fusion-born -particle studies have been priority task second experiments (DTE2) on Joint European...
Gamma-ray spectroscopy (GRS) has become an established technique to determine properties of the distribution function energetic particles in MeV range, which are fast ions from heating and fusion reactions or runaway electrons born disruptions. In this paper we present a selection recent results where GRS is key investigate physics range particles. These radio-frequency experiments, theoretical models can be tested with unprecedented degree accuracy, disruption mitigation studies, sheds...
To study the runaway electron (RE) dynamics during plasma discharge and develop scenarios for disruption mitigation, a hard x-ray (HXR) spectrometric system has been developed commissioned at ASDEX Upgrade tokamak (AUG). The diagnostic consists of two high-performance spectrometers based on LaBr3(Ce) scintillation detectors supplied with advanced electronics analysis algorithms. These view AUG chamber quasi-radially equatorial plane. measurements were carried out in RE beam generation...
Abstract Runaway electron gamma-ray detection system, a novel hard x-ray (HXR) spectrometer optimized for bremsstrahlung radiation measurement from runaway electrons in fusion plasmas, has been developed. The detector is based on 1‘×1’ LaBr 3 :Ce scintillator crystal coupled with photomultiplier tube. system an energy dynamic range exceeding 20 MeV resolution of 3% at 661.7 keV. gain stable even under severe loads, shift that stays below HXR counting rates excess 1 MCps. performance the...
Studies of the super-thermal and runaway electron behavior in ohmic lower hybrid current drive FT-2 tokamak plasmas have been carried out using information obtained from measurements hard x-ray spectra non-thermal microwave radiation intensity at frequency 10 GHz range (53 ÷ 78) GHz. A gamma-ray spectrometer based on a scintillation detector with LaBr3(Ce) crystal was used, which provides counting rates up to 107 s−1. Reconstruction energy distribution RE interacting poloidal limiter chamber...
A new tangential gamma-ray spectrometer has been developed for fast ion measurements in deuterium and deuterium–tritium plasmas of the Joint European Torus (JET). The instrument is based on a LaBr3 crystal with photo-multiplier tube replaces pre-existing bismuth germanate detector, providing enhanced energy resolution counting rate capability MHz range. line sight equipped LiH attenuator, which reduces background due to 14 MeV neutron interactions by more than two orders magnitude enables...
Abstract Alfvén eigenmode (AE) instabilities driven by alpha-particles have been observed in D- 3 He fusion experiments on the Joint European Torus (JET) with ITER-like wall. For efficient generation of from reaction, three-ion radio frequency scenario was used to accelerate neutral beam injection 100 keV deuterons higher energies core mixed plasmas at high concentrations He. A large variety fast-ion magnetohydrodynamic modes were observed, including elliptical eigenmodes (EAEs) mode numbers...
This paper provides a comprehensive study of neutron calibration methodologies, specifically highlighting the capabilities for n–γ discrimination in diamond and EJ-309, stilbene scintillation detectors. The process detailed this includes pulse height analysis shape discrimination, relying on charge deposition resulting from both γ interactions. Utilizing 60Co 252Cf radiation sources, energy spectra these sources are obtained. characterized detectors were used ST40 experiments allowed...
A multi-diagnostic study of the fast ion losses and redistribution during toroidal Alfvén eigenmodes at Globus-M Globus-M2 spherical tokamaks was performed. Mode amplitude frequency evolution are discussed. Local energy-resolved spatial transport examined using an active neutral particle analyzer. Losses dependences on mode were obtained. The change in with increase plasma current magnetic field is reported. experimental data compared modeling results.
Recent research at three small tokamaks with different parameters located the Ioffe Institute—the spherical tokamak Globus-M, large aspect ratio FT-2 and compact TUMAN-3M—are reviewed. This overview covers energy confinement (Globus-M FT-2), L–H transition (TUMAN-3M Alfvén waves TUMAN-3M), ion cyclotron emission (TUMAN-3M), major plasma discharge disruption (Globus-M) scrape-off layer studies. A full-f global gyrokinetic modeling benchmark using synthetic diagnostics in is described....
Abstract The NPA based diagnostic complex in ITER consists of four diagnostics: the neutral particle analyzers, diamond spectrometer, gamma-ray and neutron spectrometer. diagnostics are located equatorial port #11 share same vacuum channel. present paper considers physical basis its measurement capabilities ITER. In addition, design engineering solutions implemented to meet requirements described.
Abstract Unfolding techniques are employed to reconstruct the 1D energy distribution of runaway electrons from Bremsstrahlung hard X-ray spectrum emitted during plasma disruptions in tokamaks. Here we compare four inversion methods: truncated singular value decomposition, which is a linear algebra technique, maximum likelihood expectation maximization, an iterative method, and Tikhonov regularization applied χ 2 Poisson statistics, two minimization approaches. The reconstruction fidelity...
This paper highlights the most important results achieved at spherical tokamak Globus-M2 with a high magnetic field. also covers topics of fusion research: thermal energy confinement in regimes neutral beam injection, toroidal Alfvén eigenmode and correspondent fast ions issues, L-H transition, turbulence suppression edge-localized modes' behavior, experimental theoretical study nitrogen seeding that allow to significantly reduce loads on divertor plates, experiments simulations lower hybrid...