E. A. Belli
A5033524212- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Power System Optimization and Stability
- Smart Grid Security and Resilience
- Gas Dynamics and Kinetic Theory
- Laser-induced spectroscopy and plasma
- Advanced Data Storage Technologies
- Computational Fluid Dynamics and Aerodynamics
- Aerodynamics and Fluid Dynamics Research
- Parallel Computing and Optimization Techniques
- Nuclear Materials and Properties
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Neural Networks and Applications
- Nuclear Physics and Applications
- Electrostatic Discharge in Electronics
- Particle Accelerators and Free-Electron Lasers
General Atomics (United States)
2015-2024
National Agency for New Technologies, Energy and Sustainable Economic Development
2022-2024
Oak Ridge National Laboratory
2016-2023
University of California, San Diego
2016-2023
Princeton Plasma Physics Laboratory
2001-2022
University of California, Los Angeles
2022
University of Wisconsin–Madison
2022
Princeton University
2001-2022
The University of Texas at Austin
2022
Columbia University
2022
Numerical studies of neoclassical transport, beginning with the fundamental drift-kinetic equation (DKE), have been extended to include self-consistent coupling electrons and multiple ion species. The code, NEO, provides a first-principles based calculation transport coefficients directly from solution distribution function by solving hierarchy equations derived expanding DKE in powers ρ*i, ratio gyroradius system size. This includes first-order electrostatic potential via Poisson equation,...
One modeling framework for integrated tasks (OMFIT) is a comprehensive which has been developed to enable physics codes interact in complicated workflows, and support scientists at all stages of the cycle. The OMFIT development follows unique bottom-up approach, where design capabilities organically evolve progressive integration components that are required accomplish goals increasing complexity. provides workflow easily generating full kinetic equilibrium reconstructions constrained by...
Abstract The JET 2019–2020 scientific and technological programme exploited the results of years concerted engineering work, including ITER-like wall (ILW: Be W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major neutral beam injection upgrade providing record power 2019–2020, tested technical procedural preparation for safe operation with tritium. Research along three complementary axes yielded wealth new results. Firstly, plasma delivered scenarios...
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
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,...
Tokamak transport modeling scenarios, including ITER [ITER Physics Basis Editors, Nucl. Fusion 39, 2137 (1999)] performance predictions, are based exclusively on reduced models for core thermal and particle transport. The reason this is simple: computational cost. A typical scenario may require the evaluation of thousands individual fluxes (local calculate energy across a specified flux surface given fixed profiles). Despite continuous advances in direct gyrokinetic simulation, cost an...
The complete linearized Fokker–Planck collision operator has been implemented in the drift-kinetic code NEO (Belli and Candy 2008 Plasma Phys. Control. Fusion 50 095010) for calculation of neoclassical transport coefficients flows. A key aspect this work is development a fast numerical algorithm treatment field particle operator. This Eulerian can accurately treat disparate velocity scales that arise case multi-species plasmas. Specifically, Legendre series expansion ξ (the cosine pitch...
The behaviour of tungsten in the core hybrid scenario plasmas JET with ITER-like wall is analysed and modelled a combination neoclassical gyrokinetic codes. In these discharges, good confinement conditions can be maintained only for first 2?3?s high power phase. Later W accumulation regularly observed, often accompanied by onset magneto-hydrodynamical activity, particular tearing modes (NTMs), both which have detrimental effects on global energy confinement. dynamics process examined, taking...
Fusion whole device modeling simulations require comprehensive models that are simultaneously physically accurate, fast, robust, and predictive. In this paper we describe the development of two neural-network (NN) based as a means to perform snon-linear multivariate regression theory-based for core turbulent transport fluxes, pedestal structure. Specifically, find NN-based approach can be used consistently reproduce results TGLF EPED1 over broad range plasma regimes, with computational...
Abstract In JET deuterium-tritium (D-T) plasmas, the fusion power is produced through thermonuclear reactions and between thermal ions fast particles generated by neutral beam injection (NBI) heating or accelerated electromagnetic wave in ion cyclotron range of frequencies (ICRFs). To complement experiments with 50/50 D/T mixtures maximizing reactivity, a scenario dominant non-thermal reactivity has been developed successfully demonstrated during second campaign DTE2, as it was predicted to...
Recent developments in theory-based modelling of core heavy impurity transport are presented, and shown to be necessary for quantitative description present experiments JET ASDEX Upgrade. The treatment impurities is complicated by their large mass charge, which result a strong response plasma rotation or any small background electrostatic field the plasma, such as that generated anisotropic external heating. These forces lead poloidal asymmetries density, have recently been added numerical...
Accurate prediction of fusion performance in present and future tokamaks requires taking into account the strong interplay between core transport, pedestal structure, current profile, plasma equilibrium. An integrated modeling workflow capable calculating steady-state self-consistent solution to this strongly coupled problem has been developed. The leverages state-of-the-art components for collisional turbulent equilibrium stability. Testing against a DIII-D discharge shows that is robustly...
Abstract An integrated modeling workflow capable of finding the steady-state plasma solution with self-consistent core transport, pedestal structure, current profile, and equilibrium physics has been developed tested against a DIII-D discharge. Key features achieved core-pedestal coupled are its ability to account for transport impurities in self-consistently, as well use machine learning accelerated models structure turbulent physics. Notably, is implemented within One Modeling Framework...
The evolution of the JET high performance hybrid scenario, including central accumulation tungsten (W) impurity, is reproduced with predictive multi-channel integrated modelling over multiple confinement times using first-principle based core transport models.8 channels ( , ) are modelled predictively, self-consistent sources, radiation and magnetic equilibrium, yielding a system non-linearities: This can reproduce observed radiative temperature collapse after several times.W transported...
The verification and calibration of a new quasi-linear transport model with large database gyrokinetic turbulence simulations is presented in this paper. In previous paper (Staebler et al 2020 Plasma Phys. Control. Fusion 63 015013), for the saturated spectrum electric potential fluctuations was developed based on properties non-linear 3D spectrum. paper, modification to overall multiplicative factor found be necessary improve fit scans temperature density gradients. error fluxes electron...
Abstract The findings of an investigation into the properties three dimensional (3D) saturated fluctuation intensity electric potential in gyrokinetic turbulence simulations is presented. Scans flux surface elongation and Shafranov shift are used to isolate tokamak geometric dependencies. required order compute exact fluxes by a quasilinear method determined using linear eigenmodes computed with code. A model this non-linear constructed eigenmode geometry shape functions obtained from 3D...
A new set of analytical formulae for calculating the bootstrap current and neoclassical conductivity in tokamak experiments is presented. Previous works comparing widely used Sauter model with results recently developed numerical solvers have shown to be inaccurate at higher collisionalities typical edge pedestals presence impurities. Thus, its applicability, particularly analysis highly interesting complex plasma edge, limited. For a revised formulae, procedure determine described by...
Abstract In this paper, we present linear and nonlinear gyrokinetic analyses in the pedestal region of two DIII-D ELMy H-mode discharges using CGYRO code. The otherwise matched employ different divertor configurations to investigate impact varying recycling particle source on profiles. Linear simulations find electrostatic ion-scale instabilities (ion temperature gradient trapped electron modes, ITG–TEM) are just inside top with growth rates that enhanced significantly by parallel velocity...
The objective of thermonuclear fusion consists producing electricity from the coalescence light nuclei in high temperature plasmas. most promising route to envisages confinement such plasmas with magnetic fields, whose studied configuration is tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one main potential showstoppers on a commercial reactor. In this work we report how, deploying innovative analysis methods thousands JET experiments covering isotopic...
A new, more efficient method to compute unstable linear gyrokinetic eigenvalues and eigenvectors has been developed for drift-wave analysis of plasmas with arbitrary flux-surface shape, including both transverse compressional magnetic perturbations. In high-beta, strongly shaped like in the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)], numerous branches closely spaced eigenmodes exist. These modes are difficult time-consuming adequately resolve...
An Eulerian numerical discretization scheme for the solution of first-order drift-kinetic equation is presented in detail. The approach valid multi-species plasmas, including complete impurity and electron physics, thus ambipolarity properly maintained. code, NEO, provides a description second-order neoclassical transport fluxes flows, effects strong (finite Mach number) toroidal rotation. Corrections to weak rotation limit are demonstrated plasmas over wide range collisionality.
Joint experiment/theory/modelling research has led to increased confidence in predictions of the pedestal height ITER. This work was performed as part a US Department Energy Research Target FY11 identify physics processes that control H-mode structure. The study included experiments on C-Mod, DIII-D and NSTX well interpretation experimental data with theory-based modelling codes. provides ability models for peeling–ballooning stability, bootstrap current, width scaling make correct...