В. А. Токарев
A5039620059- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Rocket and propulsion systems research
- Plasma Diagnostics and Applications
- Aerospace Engineering and Control Systems
- Vehicle Dynamics and Control Systems
- Cyclone Separators and Fluid Dynamics
- Nuclear Materials and Properties
- Aerodynamics and Fluid Dynamics Research
- Field-Flow Fractionation Techniques
- Combustion and flame dynamics
- Nuclear Physics and Applications
- Fluid Dynamics and Turbulent Flows
- Gas Dynamics and Kinetic Theory
- Vehicle emissions and performance
- Vacuum and Plasma Arcs
Physico-Technical Institute
2024
Ioffe Institute
2016-2024
All-Russian Scientific Research Institute of Technical Physics
2008
The Globus-M spherical tokamak has demonstrated practically all of the project objectives during 15-year period operation. main factor limiting further progress in plasma performance is a relatively low toroidal magnetic field. maximum field achieved on was 0.4 T with exception limited number shots 0.55 T, which led to damage coil 2002. increase up 1.0 together current 0.5 MA will result significant enhancement operating parameters upgraded Globus-M2 machine. experimental program be focused...
Abstract The current work reports on the significant rise of fusion triple product in experiments carried out compact spherical tokamak (ST) Globus-M2 with a twofold increase toroidal magnetic field. A tenfold n . T τ E was recorded during an field from 0.4 to 0.8 and plasma 0.25 MA at unchanged auxiliary heating power value. Limited reasons may affect this positive trend, among which are energy confinement improvement efficiency neutral beam heating. Despite field, injection (NBI) led clear...
Abstract Hot ion mode was recently achieved at the Globus-M2 spherical tokamak when toroidal magnetic field as high 0.9 T and plasma current 0.35 MA. The injection of two neutral beams with a total power 0.7 MW an energy 30 keV into major radius 0.36 m minor 0.22 (aspect ratio 1.6) made it possible to heat ions up 4 keV, while electron density in center 8 × 10 19 −3 . achievement temperatures became due good thermal insulation plasma.
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 The work presents the results of energy confinement study carried out on compact spherical tokamak Globus-M2 with a toroidal magnetic field as high 0.8 T. A reproducible and stable discharge was obtained average plasma density (5–10) × 10 19 m −3 . Despite increase in field, neutral beam injection (NBI) led to clear transition H-mode accompanied by decrease turbulence level at edge. NBI allowed effectively heat plasma: electron ion temperatures core exceeded 1 keV. Compared previous...
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 Among the peripheral instabilities observed at Globus-M2 tokamak, two types of edge localized modes (ELMs) are brought into focus: ELMs synchronized and desynchronized with sawtooth oscillations. The appear in regimes that characterized by high values pressure pedestal, p ped ≥ 3 kPa, they discharges toroidal magnetic field B T > 0.6 plasma current I P 0.3 MA. belong to type-III/V dominating effect peeling mode. were a wider range discharge parameters, including < Calculations...
Abstract In the final Globus-M experimental campaign B tor and I p were raised by 25% up to 0.5 T 250 kA, respectively, expanding available range of parameters. these experiments an overall improvement in plasma performance was observed, total stored energy neutron rate increased significantly. The confinement time dependence on n e close linear. L-H transition threshold 5–10 times higher than predicted scaling. Despite small plasma-wall distance, level radiation losses main volume...
The paper presents the latest results and summarizes study of ion heat transport in Globus-M spherical tokamak regimes with neutral beam injection. Ion was investigated discharges various toroidal magnetic fields plasma currents. Measurements temperature were carried out using charge-exchange recombination spectroscopy a particle analyzer. Plasma simulations code ASTRA have shown that is predominantly neoclassical even for low collisionality range. local analysis indicates core stable to...
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....
The Globus-M2 spherical tokamak is the considerably upgraded Globus-M facility. Its technical parameters were increased as much possible to achieve promising range of physical (sub-fusion temperatures and collisionality less than unity). These will be achieved in a compact magnetic configuration similar that tokamak, plasma current toroidal field amounting 0.5 MA 1 T, respectively. demand increase resulted need for complete redesign electromagnetic system because equilibrium requirements...
The results are presented from the edge plasma studies performed with help of a new nine-pin Langmuir probe. design features probe head discussed. was used to measure electron density, temperature and Mach number profiles. SOL width determined power decay length compared corresponding value calculated known scalings.
The paper is devoted to the Thomson scattering (TS) diagnostics recently developed for Globus-M2 spherical tokamak and prototyping ITER divertor TS diagnostics. distinctive features of system are use spectrometers, acquisition lasers that meet base requirements describes diagnostic allows precise measurements signals, as well results first electron temperature density in both central region plasma column scrape-off layer. provides $T_{e}$ range 5 eV keV $n_{e}$...
1 ФТИ им.А.Ф.Иоффе, Санкт-Петербург, Россия 2 Санкт-Петербургский политехнический университет Петра Великого, Санкт-
Abstract Simulations of the microtearing instability developing in plasma Globus-M spherical tokamak were performed using GENE gyrokinetic code flux-tube linear approximation mode. Under effect instability, magnetic islands form on scale ion Larmor radius, and field fluctuations occur that generate electron heat fluxes. The fluxes as well associated with electrostatic are negligible. maximum growth rate is reached at a collision frequency within experimental range variation, which B T × τ E...