D. del-Castillo-Negrete
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View article: Runaway electron interactions with whistler waves in tokamak plasmas: energy-dependent transport scaling
Runaway electron interactions with whistler waves in tokamak plasmas: energy-dependent transport scaling Open
Resonant interactions between high energy runaway electrons (REs) and whistler waves are a promising mechanism for RE mitigation in tokamak plasmas. While prior studies have largely relied on quasi-linear diffusion models in simplified geo…
View article: Generative AI Models for Learning Flow Maps of Stochastic Dynamical Systems in Bounded Domains
Generative AI Models for Learning Flow Maps of Stochastic Dynamical Systems in Bounded Domains Open
Simulating stochastic differential equations (SDEs) in bounded domains, presents significant computational challenges due to particle exit phenomena, which requires accurate modeling of interior stochastic dynamics and boundary interaction…
View article: A generative artificial intelligence framework for long-time plasma turbulence simulations
A generative artificial intelligence framework for long-time plasma turbulence simulations Open
Generative deep learning techniques are employed in a novel framework for the construction of surrogate models capturing the spatiotemporal dynamics of 2D plasma turbulence. The proposed Generative Artificial Intelligence Turbulence (GAIT)…
View article: Generative-machine-learning surrogate model of plasma turbulence
Generative-machine-learning surrogate model of plasma turbulence Open
Generative artificial intelligence methods are employed for the first time to construct a surrogate model for plasma turbulence that enables long time transport simulations. The proposed GAIT (Generative Artificial Intelligence Turbulence)…
View article: Transport and losses of energetic particles in tokamaks in the presence of Alfvén activity using the new full orbit TAPaS code coupled to FAR3d
Transport and losses of energetic particles in tokamaks in the presence of Alfvén activity using the new full orbit TAPaS code coupled to FAR3d Open
Recent developments and tools integrated into the TAPaS code are presented, enabling realistic scenario simulations of particle dynamics within experimental tokamak magnetic equilibria. In particular, the enhanced capabilities of TAPaS ena…
View article: A Pseudoreversible Normalizing Flow for Stochastic Dynamical Systems with Various Initial Distributions
A Pseudoreversible Normalizing Flow for Stochastic Dynamical Systems with Various Initial Distributions Open
Here, we present a pseudoreversible normalizing flow method for efficiently generating samples of the state of a stochastic differential equation (SDE) with various initial distributions. The primary objective is to construct an accurate a…
View article: Runaway electron plateau current profile reconstruction from synchrotron imaging and Ar-II line polarization angle measurements in DIII-D
Runaway electron plateau current profile reconstruction from synchrotron imaging and Ar-II line polarization angle measurements in DIII-D Open
Current profile reconstructions are obtained for high current ( kA) post-disruption runaway electron (RE) plateau plasmas in DIII-D. Two novel methods of measuring the RE current profile in high-current RE plateaus are introduced an…
View article: Wall heating by subcritical energetic electrons generated by the runaway electron avalanche source <sup>*</sup>
Wall heating by subcritical energetic electrons generated by the runaway electron avalanche source <sup>*</sup> Open
Subcritical energetic electrons (SEEs) produced by the runaway electron (RE) avalanche source at energies below the runaway threshold are found to be the primary contributor to surface heating of plasma-facing components (PFCs) during fina…
View article: A Probabilistic Scheme for Semilinear Nonlocal Diffusion Equations with Volume Constraints
A Probabilistic Scheme for Semilinear Nonlocal Diffusion Equations with Volume Constraints Open
This work presents a probabilistic scheme for solving semilinear nonlocal diffusion equations with volume constraints and integrable kernels. The nonlocal model of interest is defined by a time-dependent semilinear partial integro-differen…
View article: Effect of the neutral beam injector operational regime on the Alfven eigenmode saturation phase in DIII-D plasma
Effect of the neutral beam injector operational regime on the Alfven eigenmode saturation phase in DIII-D plasma Open
The aim of this study is to analyze the effect of the neutral beam injector (NBI) operation regime on the saturation phase of the Alfven Eigenmodes (AEs) in DIII-D plasma. The analysis is done using the linear and nonlinear versions of the…
View article: A pseudo-reversible normalizing flow for stochastic dynamical systems with various initial distributions
A pseudo-reversible normalizing flow for stochastic dynamical systems with various initial distributions Open
We present a pseudo-reversible normalizing flow method for efficiently generating samples of the state of a stochastic differential equation (SDE) with different initial distributions. The primary objective is to construct an accurate and …
View article: A divergence-free constrained magnetic field interpolation method for scattered data
A divergence-free constrained magnetic field interpolation method for scattered data Open
An interpolation method to evaluate magnetic fields, given its unstructured and scattered magnetic data, is presented. The method is based on the reconstruction of the global magnetic field using a superposition of orthogonal functions. Th…
View article: Publisher's Note: “Lagrangian conditional statistics and flow topology in edge plasma turbulence” [Phys. Plasmas <b>29</b>, 102301 (2022)]
Publisher's Note: “Lagrangian conditional statistics and flow topology in edge plasma turbulence” [Phys. Plasmas <b>29</b>, 102301 (2022)] Open
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View article: Lagrangian conditional statistics and flow topology in edge plasma turbulence
Lagrangian conditional statistics and flow topology in edge plasma turbulence Open
Lagrangian statistics and particle transport in edge plasma turbulence are investigated using the Hasegawa–Wakatani model and its modified version. The latter shows the emergence of pronounced zonal flows. Different values of the adiabatic…
View article: A divergence-free constrained magnetic field interpolation method for scattered data
A divergence-free constrained magnetic field interpolation method for scattered data Open
An interpolation method to evaluate magnetic fields given unstructured, scattered magnetic data is presented. The method is based on the reconstruction of the global magnetic field using a superposition of orthogonal functions. The coeffic…
View article: Transport, flow topology and Lagrangian conditional statistics in edge plasma turbulence
Transport, flow topology and Lagrangian conditional statistics in edge plasma turbulence Open
Lagrangian statistics and particle transport in edge plasma turbulence are investigated using the Hasegawa-Wakatani model and its modified version. The latter shows the emergence of pronounced zonal flows. Different values of the adiabatic…
View article: A probabilistic scheme for semilinear nonlocal diffusion equations with volume constraints
A probabilistic scheme for semilinear nonlocal diffusion equations with volume constraints Open
This work presents a probabilistic scheme for solving semilinear nonlocal diffusion equations with volume constraints and integrable kernels. The nonlocal model of interest is defined by a time-dependent semilinear partial integro-differen…
View article: Computational study of runaway electrons in MST tokamak discharges with applied resonant magnetic perturbation
Computational study of runaway electrons in MST tokamak discharges with applied resonant magnetic perturbation Open
A numerical study of magnetohydrodynamics (MHD) and tracer-particle evolution investigates the effects of resonant magnetic perturbations (RMPs) on the confinement of runaway electrons (REs) in tokamak discharges conducted in the Madison S…
View article: Off-axis runaway-electron seed formation, growth and suppression
Off-axis runaway-electron seed formation, growth and suppression Open
Novel x-ray detection technology enabled the first profile measurements of the birth and growth dynamics of runaway electrons (REs) at the edge of tokamaks during quiescent RE studies at the Madison Symmetric Torus. The formation of an off…
View article: Transport and losses of fusion-born alpha particles in the presence of tearing modes using the new Toroidal Accelerated P<scp>a</scp>rticle Simulator (<scp>TAPaS</scp>)
Transport and losses of fusion-born alpha particles in the presence of tearing modes using the new Toroidal Accelerated P<span>a</span>rticle Simulator (<span>TAPaS</span>) Open
The transport and losses of fusion-born alpha particles are studied in the presence of a single-helicity tearing mode, characterized by ( ). The analysis is performed by means of the recently developed Toroidal Accelerated P a rtic…
View article: A novel path to runaway electron mitigation via deuterium injection and current-driven MHD instability
A novel path to runaway electron mitigation via deuterium injection and current-driven MHD instability Open
Relativistic electron (RE) beams at high current density (low safety factor, qa) yet very low free-electron density accessed with D2 secondary injection in the DIII-D and JET tokamak are found to exhibit large-scale MHD instabilities that …
View article: Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D
Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D Open
A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range be…
View article: Anomalous losses of energetic particles in the presence of an oscillating radial electric field in fusion plasmas
Anomalous losses of energetic particles in the presence of an oscillating radial electric field in fusion plasmas Open
The confinement of energetic particles in nuclear fusion devices is studied in the presence of an oscillating radial electric field and an axisymmetric magnetic equilibrium. It is shown that, despite the poloidal and toroidal symmetries, i…