А. А. Иванов
A5086844548- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Ion-surface interactions and analysis
- Dust and Plasma Wave Phenomena
- Nuclear reactor physics and engineering
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
- Atomic and Subatomic Physics Research
- Metal and Thin Film Mechanics
- Mass Spectrometry Techniques and Applications
- Plasma Applications and Diagnostics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Pulsed Power Technology Applications
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
Budker Institute of Nuclear Physics
2014-2024
Siberian Branch of the Russian Academy of Sciences
2013-2024
European Organization for Nuclear Research
2023
Paul Scherrer Institute
2023
St. Petersburg State Technological Institute
1994-2022
Novosibirsk State University
2012-2021
Volgograd State Agricultural University
2020-2021
Tomsk State University of Control Systems and Radio-Electronics
2015-2021
Keldysh Institute of Applied Mathematics
2006-2020
Joint Institute for Nuclear Research
2015-2020
A gas dynamic trap (GDT) is a version of magnetic mirror whose characteristic features are long mirror-to-mirror distance, which exceeds the effective mean free path ion scattering into loss cone, large ratio (R ∼ 100) and axial symmetry. Under these conditions, plasma confined in GDT isotropic Maxwellian. The rate at it lost out ends governed by set simple gas-dynamic equations, hence name device. Plasma magnetohydrodynamic stability achieved through outflow end mirrors regions, where...
Conventional field-reversed configurations (FRCs), high-beta, prolate compact toroids embedded in poloidal magnetic fields, face notable stability and confinement concerns. These can be ameliorated by various control techniques, such as introducing a significant fast ion population. Indeed, adding neutral beam injection into the FRC over past half-decade has contributed to striking improvements stability. Further, addition of electrically biased plasma guns at ends, end plugs, advanced...
This paper summarizes the results of experiments on electron cyclotron resonance heating (ECRH) plasma obtained at axially symmetric magnetic mirror device gas dynamic trap (GDT) (Budker Institute, Novosibirsk). The main achievement is demonstration discharges with extremely high temperatures bulk electrons. According to Thomson scattering measurements, on-axis temperature averaged over several sequential shots 660 ± 50 eV peak values exceeding 900 in a few shots. corresponds an least...
Tokamak scenario development requires an understanding of the properties that determine kinetic profiles in non-steady plasma phases and self-consistent evolution magnetic equilibrium. Current ramps are particular interest since many transport-relevant parameters explore a large range values their impact on transport mechanisms has to be assessed. To this purpose, novel full-discharge modelling tool been developed, which couples code ASTRA (Pereverzev et al 1991 IPP Report 5/42) free...
The paper discusses edge stability, beta limits and power handling issues for negative triangularity tokamaks. magnetohydrodynamic stability is the most crucial item handling. For case of picture quite different from that conventional positive tokamaks: second access closed localized Mercier/ballooning modes due to absence a magnetic well, nearly internal kink set pedestal height limit be weakly sensitive diamagnetic stabilization just above margin mode Mercier criterion violation. While...
The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV/$c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins $3\pi$ mass and four-momentum transfer isobar model so far largest PWA consisting 88 waves. narrow $J^{PC} = 1^{++}$ signal is observed $f_0(980)\,\pi$ channel. We present resonance-model study subset spin-density matrix selecting states with 2^{++}$ $4^{++}$ decaying...
TAE Technologies' research is devoted to producing high temperature, stable, long-lived field-reversed configuration (FRC) plasmas by neutral-beam injection (NBI) and edge biasing/control. The newly constructed C-2W experimental device (also called 'Norman') the world's largest compact-toroid (CT) device, which has several key upgrades from preceding C-2U such as higher input power longer pulse duration of NBI system well installation inner divertors with upgraded electrode biasing systems....
Field reversed configurations (FRCs) with high confinement are obtained in the C-2 device by combining plasma gun edge biasing and neutral beam injection. The creates an inward radial electric field that counters usual FRC spin-up. n = 2 rotational instability is stabilized without applying quadrupole magnetic fields. FRCs nearly axisymmetric, which enables fast ion confinement. also produces E × B shear layer, may explain observed improved particle transport. times factors to 4, lifetimes...
This paper considers a fast track to non-energy applications of nuclear fusion that is associated with the ‘fusion for neutrons’ (F4N) paradigm. Being useful product accompanying energy, neutrons are more valuable than energy released in DT reactions and they urgently needed research purposes develop validate modern technologies. In near future neutron yield devices will become significantly larger fission accelerator sources. describes compact tokamak source based on small spherical...
The first experiments on noninductive current drive (CD) using lower hybrid waves in a spherical tokamak are described. Waves at 2.45 GHz were launched by 10 waveguide grill with 120° phase shift between neighbouring waveguides. experimental results for novel poloidal slowing-down scheme CD efficiency is found to be somewhat larger than that predicted theoretically whilst the same time being less standard CD. Geodesic acoustic modes (GAM) have been discovered Globus-M. GAMs localized 2–3 cm...
Abstract The gas dynamic trap (GDT) is a version of magnetic mirror with long mirror-to-mirror distance far exceeding the effective mean free path ion scattering into loss cone, large ratio ( R ∼ 100; = B max / min field inductions at and center) axial symmetry. Under these conditions, in contrast to conventional mirror, plasma confined GDT isotropic Maxwellian. rate through ends governed by set simple equations; hence, name device. lifetime on order LR V Ti , where L distance, thermal...
Development of a new linear device for confinement fusion plasmas is under way in the Budker Institute Nuclear Physics, Novosibirsk. The combines features existing GOL-3 and GDT traps, namely, central GDT-like cell with sloshing ions produced by intense neutral beam injection, multiple-mirror end sections suppression axial plasma losses. It designed as prototype an energy-efficient neutron source testbed development mirror-based reactors.
Tri Alpha Energy's experimental program has demonstrated reliable field-reversed configuration (FRC) formation and sustainment, driven by fast ions via high-power neutral-beam (NB) injection. The world's largest compact-toroid device, C-2U, was upgraded from C-2 with the following key system upgrades: increased total NB input power ~4 MW (20 keV hydrogen) to 10+ (15 tilted injection angle; enhanced edge-biasing capability inside of each end divertor for boundary/stability control. C-2U...
A so called vortex confinement of plasma in axially symmetric mirror device was studied. This recently developed approach enables to significantly reduce transverse particle and heat losses typically caused by MHD instabilities which can be excited this case. Vortex regime established application different potentials the radial limiters end-plates. As a result, sheared flow at periphery appears wraps core. Experiments were carried out on gas dynamic trap device, where hot ions with mean...
Energy confinement comparable with tokamak quality is achieved in the Madison Symmetric Torus (MST) reversed field pinch (RFP) at a high beta and low toroidal magnetic field. Magnetic fluctuations normally present RFP are reduced via parallel current drive outer region of plasma. In response, electron temperature nearly triples doubles. The time increases ten-fold (to ∼10 ms), which L- H-mode scaling values for same plasma current, density, heating power, size shape. Runaway evidenced by...
Large field reversed configurations (FRCs) are produced in the C-2 device by combining dynamic formation and merging processes. The good confinement of these FRCs must be further improved to achieve sustainment with neutral beam (NB) injection pellet fuelling. A plasma gun is installed at one end attempt electric control FRC edge layer. inward radial counters usual spin-up mitigates n = 2 rotational instability without applying quadrupole magnetic fields. Better centering also obtained,...
During the past decade multi-dipolar plasmas have been employed for various purposes such as surface treatments in biomedicine, physical and chemical vapour deposition hydrogen storage, applications mechanical engineering. On other hand, due to design operational mode of these plasma sources (i.e., strong permanent magnets electron cyclotron resonance coupling, low working pressure, high density achieved) they are suitable studying fundamental mechanisms involved negative ion used...
The paper presents the project and development strategy of a continuously operating high-flux (>) fusion volumetric neutron source. proposed facility is based on gas-dynamic magnetic plasma confinement device with high-power () neutral beam injection. Project roadmap includes construction several prototype installations addressing specific set physics engineering problems, starting from continuous operation critical subsystems ending advanced problems to axisymmetric mirror-based machines....
One of the three goals ITER project is to demonstrate fusion gain Q ≥ 5 in steady-state operation (SSO). A reassessment necessary conditions for SSO has been carried out scenarios assuming no internal transport barrier core plasma and with sole use neutral beam injection (NBI) electron cyclotron heating current drive (EC H&CD) as sources these scenarios. The parametric operational space reassessed utilizing an inverse evaluation approach that takes into account baseline design NBI EC H&CD...
A curvature-driven flute instability will be excited in the magnetized plasmas if magnetic field lines curve toward entire plasma boundary. Conditions under which it can effectively stabilized axisymmetric geometry have been experimentally studied a gas-dynamic trap (GDT) at Novosibirsk. Flexible design of experimental device and availability neutral beams ion cyclotron heating enabled pressure-weighted curvature to varied over wide range. The stability limits were thus measured compared...