E. V. Belova
A5063995477- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Geomagnetism and Paleomagnetism Studies
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Laser-induced spectroscopy and plasma
- Parkinson's Disease Mechanisms and Treatments
- Neurological disorders and treatments
- Electric Motor Design and Analysis
- Magnetic Field Sensors Techniques
- Radiation Effects in Electronics
- Ion-surface interactions and analysis
- Nuclear reactor physics and engineering
- Dust and Plasma Wave Phenomena
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Launch and Propulsion Technology
Princeton Plasma Physics Laboratory
2013-2025
Semenov Institute of Chemical Physics
2024
Princeton University
1999-2024
University of California, Los Angeles
2021
Siberian Federal University
2020
Samara National Research University
2016
Swarthmore College
2012
Massachusetts Institute of Technology
2000
New York University
2000
Dartmouth College
1997
First Page
Abstract The objectives of NSTX-U research are to reinforce the advantages STs while addressing challenges. To extend confinement physics low- A , high beta plasmas lower collisionality levels, understanding transport mechanisms that set performance and pedestal profiles is being advanced through gyrokinetic simulations, reduced model development, comparison NSTX experiment, as well improved simulation RF heating. develop stable non-inductive scenarios needed for steady-state operation,...
The question of how to proceed toward ever more realistic plasma simulation studies using increasing computing power is addressed. answer presented here the M3D (Multilevel 3D) project, which has developed a code package with hierarchy physics levels that resolve increasingly complete subsets phase-spaces and are thus realistic. rationale for multilevel models given. Each level described examples its application existing fluid (3D configuration space), namely magnetohydrodynamic (MHD)...
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...
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...
An improved understanding of Field Reversed Configuration (FRC) merging and stability in high acceleration compression magnetic fields is needed to speed up the development pulsed fusion concept developed at Helion Energy. All previous theoretical simulation work on FRC was performed using 2D MHD models. The results novel hybrid simulations (fluid electrons full-orbit kinetic ions) are presented. Results simulations, computed HYM code, compared analyzed. In cases without axial compression,...
Global stability of the field-reversed configuration (FRC) has been investigated numerically using both three-dimensional magnetohydrodynamic and hybrid (fluid electron δf particle ion) simulations. The stabilizing effects velocity shear finite ion Larmor radius (FLR) on n=1 internal tilt mode in prolate FRCs have studied. Sheared rotation is found to reduce growth rate, however a large rate with Mach number M≳1 required order for significant reduction instability occur. Kinetic associated...
The mission of the National Spherical Torus Experiment (NSTX) is demonstration physics basis required to extrapolate next steps for spherical torus (ST), such as a plasma facing component test facility (NHTX) or an ST based (ST-CTF), and support ITER. Key issues are transport, steady state high β operation. To better understand electron new high- k scattering diagnostic was used extensively investigate gyro-scale fluctuations with varying temperature gradient scale length. Results from n = 3...
An energy-channeling mechanism is proposed to explain flattening of the electron temperature profiles at a high beam power in beam-heated National Spherical Torus Experiment (NSTX). Results self-consistent simulations neutral-beam-driven compressional Alfv\'en eigenmodes (CAEs) NSTX are presented that demonstrate strong coupling CAEs kinetic waves resonance location. It suggested can channel energy from ions location resonant mode conversion edge density profile, modifying deposition profile.
In this Letter we present data from experiments on the National Spherical Torus Experiment Upgrade, where it is shown for first time that small amounts of high pitch-angle beam ions can strongly suppress counterpropagating global Alfv\'en eigenmodes (GAE). GAE have been implicated in redistribution fast and modification electron power balance previous NSTX. The ability to predict stability modes, developing methods control them, important fusion reactors like International Tokamak...
In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct reduction of gold on magnetic surface using amino acid methionine as a reducer and stabilizing agent simultaneously. The obtained after three steps deposition had an average size about 120 nm. analysis particles was performed X-ray diffraction, transmission electron microscopy, photoelectron spectroscopy, UV-Vis spectroscopy techniques. results indicate successful synthesis with core, which consists few...
New observations of sub-cyclotron frequency instability in low aspect ratio plasmas national spherical torus experiments are reported. The frequencies observed instabilities correlate with the characteristic Alfvén velocity plasma. A theory localized compressional eigenmodes (CAE) and global shear (GAE) is presented to explain high instabilities. CAEs/GAEs driven by space gradient energetic super-Alfvénic beam ions via Doppler shifted cyclotron resonances. One main damping mechanisms GAEs,...
A theoretical model is developed which allows the self-consistent inclusion of effects energetic beam ions in equilibrium calculations low-aspect-ratio toroidal devices. two-component plasma considered, where are treated using a kinetic Vlasov description, while one-fluid magnetohydrodynamic description used to represent thermal plasma. The for an anisotropic distribution function and large Larmor radius ions. Numerical results obtained neutral-beam-heated plasmas National Spherical Torus...
Kazakhstan is one of the 14 countries with a high rate morbidity due to multidrug-resistant tuberculosis (MDR TB) in WHO European region. The aim our study was characterize mutations associated drug resistance rifampicin and isoniazid Mycobacterium isolates from Kazakhstan. M. strains were isolated TB patients different regions A susceptibility test performed on Lowenstein-Jensen medium using absolute concentration method. Sequencing analysis rpoB resistance-determining region katG gene,...
Results of 3D nonlinear simulations neutral-beam-driven compressional Alfvén eigenmodes (CAEs) in the National Spherical Torus Experiment (NSTX) are presented. Hybrid MHD-particle for H-mode NSTX discharge (shot 141398) using HYM code show unstable CAE modes a range toroidal mode numbers, n=4−9, and frequencies below ion cyclotron frequency. It is found that essential feature CAEs their coupling to kinetic wave (KAW) occurs on high-field side at resonance location. High-frequency frequently...
The National Spherical Torus Experiment (NSTX) is currently being upgraded to operate at twice the toroidal field and plasma current (up 1 T 2 MA), with a second, more tangentially aimed neutral beam (NB) for rotation control, allowing pulse lengths up 5 s. Recent NSTX physics analyses have addressed topics that will allow NSTX-Upgrade achieve research goals critical Fusion Nuclear Science Facility. These include producing stable, 100% non-inductive operation in high-performance plasmas,...
Fast-ion driven Alfv\'en waves with frequency close to the ion cyclotron ($f=0.58{f}_{ci}$) excited by energetic ions from a neutral beam are stabilized via controlled density ramp for first time in fusion research plasma. The scaling of wave amplitude injection rate is consistent theory single mode collisional saturation near marginal stability. identified as shear-polarized global eigenmode Doppler-shifted resonance fast sub-Alfv\'enic ions, plasmas.
Abstract TAE Technologies’ fifth-generation fusion device, C-2W (also called ‘Norman’), is the world’s largest compact-toroid device and has made significant progress in field-reversed configuration (FRC) plasma performance. produces record breaking, macroscopically stable, high-temperature advanced beam-driven FRC plasmas, dominated by injected fast particles sustained steady state, which primarily limited neutral-beam (NB) pulse duration. The NB power supply system recently been upgraded...
Recent observations of instabilities in MHz frequency range the National Spherical Torus experiments (NSTX) and their analysis are reported. The instability is correlated with characteristic Alfvén velocity plasma, vA. observed explained as compressional eigenmodes (CAEs) driven by energetic beam ions. Based on a localized CAE solution, mode frequencies essentially at location given ωCAE = vAm/r, where m poloidal number, r minor radius. Energetic ions that Doppler shifted cyclotron resonance...
Instabilities excited by the fast-ion population on NSTX (Ono et al 2000 Nucl. Fusion 40 557 ) extend from low-frequency energetic particle modes (EPMs) at tens of kHz through toroidal Alfvén eigenmodes (TAEs) in range 50–150 to global and compressional (GAE CAE) frequency 0.3–2.5 MHz, or roughly 0.1ω ci 0.7ω . The GAE instabilities exhibit complex non-linear behaviour, including onset strong growth above an amplitude threshold. This is conjectured occur when resonance regions phase space...
Abstract The mission of the low aspect ratio spherical tokamak NSTX-U is to advance physics basis and technical solutions required for optimizing configuration next-step steady-state fusion devices. will ultimately operate at up 2 MA plasma current 1 T toroidal field on axis 5 s, has available 15 MW neutral beam injection power different tangency radii 6 high harmonic fast wave heating. With these capabilities develop understanding control tools ramp-up sustain performance fully...