Н. Н. Гореленков
A5042892660- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Dust and Plasma Wave Phenomena
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Quantum chaos and dynamical systems
- Astro and Planetary Science
- Fluid Dynamics and Turbulent Flows
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Ion-surface interactions and analysis
- Mass Spectrometry Techniques and Applications
- Radiation Effects in Electronics
- Engineering Applied Research
- Laser-induced spectroscopy and plasma
- Tropical and Extratropical Cyclones Research
- Computational Fluid Dynamics and Aerodynamics
Princeton Plasma Physics Laboratory
2015-2024
Princeton University
2012-2024
The University of Texas at Austin
2005-2019
Fusion Academy
1994-2019
Fusion (United States)
1994-2019
Massachusetts Institute of Technology
1994-2015
Plasma Technology (United States)
1994-2015
Hefei Institutes of Physical Science
2014
Chinese Academy of Sciences
2014
Institute of Plasma Physics
2014
This chapter reviews the progress accomplished since redaction of first ITER Physics Basis (1999 Nucl. Fusion 39 2137–664) in field energetic ion physics and its possible impact on burning plasma regimes. New schemes to create ions simulating fusion-produced alphas are introduced, accessing experimental conditions direct relevance for plasmas, terms Alfvénic Mach number normalised pressure gradient ions, though orbit characteristics size cannot always match those ITER. Based theoretical...
The area of energetic particle (EP) physics in fusion research has been actively and extensively researched recent decades. progress achieved advancing understanding EP substantial since the last comprehensive review on this topic by Heidbrink Sadler (1994 Nucl. Fusion 34 535). That coincided with start deuterium–tritium (DT) experiments Tokamak Test Reactor (TFTR) full scale alphas studies.
Gyrokinetic simulations of the fishbone instability in DIII-D tokamak plasmas find that self-generated zonal flows can dominate nonlinear saturation by preventing coherent structures from persisting or drifting energetic particle phase space when mode frequency down-chirps. Results simulation with agree quantitatively, for first time, experimental measurements amplitude and transport. Moreover, fishbone-induced are likely responsible formation an internal transport barrier was observed after...
Abstract The spherical tokamak (ST) is a leading candidate for Fusion Nuclear Science Facility (FNSF) due to its compact size and modular configuration. National Spherical Torus eXperiment (NSTX) MA-class ST facility in the US actively developing physics basis an ST-based FNSF. In plasma transport research, experiments exhibit strong (nearly inverse) scaling of normalized confinement with collisionality, if this trend holds at low high fusion neutron fluences could be achievable very...
Intense axisymmetric oscillations driven by suprathermal ions injected in the direction counter to toroidal plasma current are observed DIII-D tokamak. The modes appear at nearly half ideal geodesic acoustic mode frequency, plasmas with comparable electron and ion temperatures elevated magnetic safety factor (${q}_{\mathrm{min}}\ensuremath{\ge}2$). Strong bursting frequency chirping observed, concomitant large (10%--15%) drops neutron emission. Large density fluctuations...
Peak fusion power production of 6.2\ifmmode\pm\else\textpm\fi{}0.4 MW has been achieved in TFTR plasmas heated by deuterium and tritium neutral beams at a total 29.5 MW. These have an inferred central alpha particle density 1.2\ifmmode\times\else\texttimes\fi{}${10}^{17}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$ without the appearance either disruptive magnetohydrodynamics events or detectable changes Alfv\'en wave activity. The measured loss rate energetic particles agreed with...
Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application fast-ion D_{alpha} (FIDA) spectroscopy to Alfvén-eigenmode physics shows that profile is anomalously flat inner half discharge. Neutron equilibrium measurements corroborate FIDA data. current density driven by fast ions also strongly modified. Calculations based on measured mode amplitudes do not...
Neutral beam injection into reversed magnetic shear DIII-D and ASDEX Upgrade plasmas produces a variety of Alfvénic activity including toroidicity-induced Alfvén eigenmodes (RSAEs). These modes are studied during the discharge current ramp phase when incomplete penetration results in high central safety factor increased drive due to multiple higher order resonances. Scans injected 80 keV neutral power on showed transition from classical AE dominated fast ion transport and, as previously...
The collective Thomson scattering (CTS) diagnostic proposed for ITER is designed to measure projected 1D fast-ion velocity distribution functions at several spatial locations simultaneously. frequency shift of scattered radiation and the geometry place fast ions that caused in well-defined regions space, here dubbed interrogation regions. Since CTS instrument measures entire spectra radiation, many different are probed We give analytic expressions weight describing regions, we show typical...
Remarkable progress has been made in diagnosing energetic particle instabilities on presentday machines and establishing a theoretical framework for describing them.This overview describes the much improved diagnostics of Alfvén modelling tools developed world-wide, discusses interpreting observed phenomena.A multi-machine comparison is presented giving information performance both different plasma conditions outlining expectations ITER based our present knowledge.
This paper reports verification and validation of linear simulations Alfven eigenmodes in the current ramp phase DIII-D L-mode discharge #159243 using gyrokinetic, gyrokinetic-MHD hybrid, eigenvalue codes.Using a classical fast ion profile, all simulation codes find that reversed shear (RSAE) are dominant instability.The real frequencies from have coefficient variation less than 5% for most unstable modes with toroidal mode number n = 4 5.The simulated RSAE agree experimental measurements if...
Fast particles in fusion plasmas may drive Alfvén modes unstable leading to fluctuations of the internal electromagnetic fields and potential loss particles. Such instabilities can have an impact on performance wall-load machines with burning such as ITER. A linear benchmark for a toroidal eigenmode (TAE) is done 11 participating codes broad variation physical well numerical models. reasonable agreement around 20% has been found growth rates. Also, eigenfunctions mode frequencies satisfying....
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...
Alpha-particle-driven toroidal Alfvén eigenmodes (TAEs) have been observed for the first time in deuterium-tritium (D-T) plasmas on tokamak fusion test reactor (TFTR). These modes are 100–200 ms following end of neutral beam injection with reduced central magnetic shear and elevated safety factor [q0>1]. Mode activity is localized to region discharge r/a<0.5 fluctuation level B̃⊥/B∥∼10−5 mode numbers range n=2–4, consistent theoretical calculations α-TAE stability TFTR.Received 11 November...
The effects of finite drift orbit width (FOW) and Larmor radius (FLR) fast particles on the stability low-n toroidicity-induced Alfvén eigenmodes (TAE) are studied. formulation is based solution low frequency gyrokinetic equation (ω≪ωc, where ωc particle cyclotron frequency). A quadratic form has been derived in terms invariant variables; energy E, magnetic moment μ, toroidal angular momentum Pφ. growth rate TAE computed perturbatively using numerical averaging over orbit. This new...
After many years of fusion research, the conditions needed for a D–T reactor have been approached on Tokamak Fusion Test Reactor (TFTR) [Fusion Technol. 21, 1324 (1992)]. For first time unique phenomena present in plasma are now being studied laboratory plasma. The magnetic experiments to study plasmas using nearly equal concentrations deuterium and tritium carried out TFTR. At maximum power 10.7 MW, 39.5 MW neutral-beam heating, supershot discharge 6.7 high-βp following current rampdown....
A wide variety of fast ion driven instabilities are excited during neutral beam injection (NBI) in the National Spherical Torus Experiment (NSTX) [Nucl. Fusion 40, 557 (2000)] due to large ratio velocity Alfvén velocity, Vfast∕VAlfvén, and high beta. The Vfast∕VAlfvén ITER 39, 2137 (1999)] NSTX is comparable. modes can be divided into three categories: chirping energetic particle (EPM) frequency range 0 120kHz, toroidal eigenmodes (TAE) with a 50kHz 200kHz, compressional global (CAE GAE,...
Kinetic theory and experimental observations of a special class energetic particle driven instabilities called here beta-induced Alfvén-acoustic eigenmodes (BAAEs) are reported confirming, previous results [N. N. Gorelenkov et al., Plasma Phys. Controlled Fusion 49, B371 (2007)]. The kinetic is based on the ballooning dispersion relation where drift frequency effects retained. BAAE gaps recovered in theory. It shown that observed certain low-frequency DIII-D [J. L. Luxon, Nucl. 42, 614...
Modification of a high energy particle distribution by spectrum low amplitude modes is investigated using guiding center code. Only through resonance are effective in modifying the distribution. Diagnostics used to illustrate mode–particle interaction and find which effects relevant producing significant resonance, including kinetic Poincaré plots showing those orbits with time averaged transfer. Effects pitch angle scattering drag studied, as well plasma rotation dependence equilibrium mode...
We report the observation of a correlation between shear Alfv\'en eigenmode activity and electron transport in plasma regimes where temperature gradient is flat, thus drive for microinstabilities absent. Plasmas having rapid central show intense, broadband global (GAE) 0.5--1.1 MHz range, while plasmas with low are essentially GAE-free. The first theoretical assessment GAE-electron connection indicates that overlapping modes can resonantly couple to bulk thermal electrons induce their...
Research on the National Spherical Torus Experiment, NSTX, targets physics understanding needed for extrapolation to a steady-state ST Fusion Nuclear Science Facility, pilot plant, or DEMO. The unique operational space is leveraged test theories next-step tokamak operation, including ITER. Present research also examines implications coming device upgrade, NSTX-U. An energy confinement time, τE, scaling unified varied wall conditions exhibits strong improvement of BTτE with decreased electron...
Tokamak power plants are studied with advanced and conservative design philosophies to identify the impacts on resulting designs provide guidance critical research needs. Incorporating updated physics understanding using more sophisticated engineering analysis, tokamak configurations have developed a credible basis compared older studies. The configuration assumes self-cooled lead lithium blanket concept SiC composite structural material 58% thermal conversion efficiency. This plasma has...
The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in summer of 2015.NSTX-U first plasma subsequently achieved, diagnostic control systems have been commissioned, H-mode accessed, magnetic error fields identified mitigated, physics research campaign carried out.During ten run weeks operation, NSTX-U surpassed record pulse-durations toroidal (TF), high-performance ~1 MA plasmas comparable to best sustained near...
Abstract A recent DIII-D experiment investigating the impact of electron cyclotron heating (ECH) on neutral beam driven reversed shear Alfvén eigenmode (RSAE) activity is presented. The includes variations ECH injection location and timing, current ramp rate, geometry (on/off-axis), power. Essentially all carried out in this were observed to change AE significantly. In some cases, RSAEs be enhanced with near off-axis minimum magnetic safety factor ( <?CDATA ${{q}_{\min}}$ ?> <mml:math...