A5036313427- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Vacuum and Plasma Arcs
- Cyclone Separators and Fluid Dynamics
- Plasma Diagnostics and Applications
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Radiation Effects in Electronics
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Advanced Frequency and Time Standards
- Quantum optics and atomic interactions
Ioffe Institute
2015-2024
Physico-Technical Institute
2014-2024
Budker Institute of Nuclear Physics
2020
Physical and Technical Institute
2015
Russian Academy of Sciences
2010-2012
In this paper we present the fusion related activities of Plasma Physics Division at Ioffe Institute. The first experiments on lower hybrid current drive (LHCD) in a spherical tokamak performed Globus-M (R = 0.36 m, 0.24 Bt 0.4 T, Ip 200 kA) with novel poloidally oriented grill resulted an RF driven up to 30 kA (100 kW, 2.5 GHz), exceeding modelling predictions. At FT-2 0.56 0.08 3 traditional toroidally revealed no strong dependence LHCD density limit H/D ratio spite LH resonance densities...
Abstract Active NPA measurements of the fast ion distribution using neutral beam as an additional charge exchange target are discussed. Expressions for calculation signal based on and reconstruction from provided. Demonstration described approach is carried out Globus-M2 spherical tokamak, where a scanning system NPAs was recently installed. Main features active application considered. The energy spatial distributions deuterium ions at dedicated pitch angles obtained compared with calculated...
The main object of the neutral particle analysis (NPA) on ITER is to measure hydrogen isotope composition plasma using measurements neutralized fluxes corresponding ions. In burning scenarios reliable on-line tritium/deuterium (T/D) density ratio stands out as most important application diagnostics. This paper presents results error NPA signals for ?official? scenarios?inductive and steady state. goal study find range values T/D ratio, where meet requirements specified this parameter, i.e....
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.
The TJ-II stellarator, a magnetically confined plasma device, is equipped with broad range of diagnostics for characterization. These include 4 neutral particle analyzers (NPAs), consisting two Acord-12's, to perform poloidal measurements, plus compact NPA, and an Acord-24, these in tangential viewing positions. Acord-12's were originally rows 6 channels each, one hydrogen neutrals the other deuterium but changed single row 12 detectors hydrogen, principal working gas TJ-II. With this...
Sawtooth mixing of fast ions is considered in ITER for plasma parameters close to the inductive 15 MA scenario. New formula presented a drift trajectory averaged distribution function (DF) passing and trapped ions. This generalizes Kadomtsev's model case non-circular magnetic surfaces, arbitrary aspect ratio, significant deviations charged particle trajectories from flux can be applicable wide class instabilities. Generalized formulae are implemented Fokker–Planck package three-dimensional...
ОСОБЕННОСТИ КОНСТРУКЦИИ СИСТЕМЫ ДИАГНОСТИКИ ПО ПОТОКАМ АТОМОВ ИЗОТОПОВ ВОДОРОДА ДЛЯ МЕЖДУНАРОДНОГО ТЕРМОЯДЕРНОГО РЕАКТОРА ИТЭРС.Я.Петров 1 , В
The use of the neutral particle analysis (NPA) to study ion component plasma on ITER has been reviewed. Both thermal (10–200 keV) and supra‐thermal (0.2–4 MeV) energy ranges fluxes are studied in respect feasibility fusion fuel isotopic composition measurements. Influence heating beams diagnostic beam measurements is also shown. Possible application NPA measure distribution function alpha particles discussed. Low‐ high‐energy monitors have proposed for DEMO machine control DT isotope ratio.
One of the objectives neutral particle diagnostics on large tokamaks exploring DT plasma is to measure distribution functions fast deuterium (D) and tritium (T) ions in a suprathermal energy range. High tails D,T-ion distributions (so-called knock-on ions) appear as result close elastic collisions between thermal fuel fusion α-particles. The ion density depends directly Therefore measurements neutralized fluxes escaping from volume can provide information α-particle confinement plasma. This...
Bench tests of a 15 keV helium ion source, which has been developed for the neutral particle diagnostic system International Thermonuclear Experimental Reactor (ITER), are described. Being part system, source will be used to monitor intactness carbon stripping foils as well check detection and dispersion systems main instruments—neutral analyzers (NPAs). The produces wide 5-cm diameter (FWHM) beam at distance about 50 cm; uniformity 2-cm area corresponding size foil is not worse than 10%....