151 citations · 475 across the 21 of their papers we have counts for
21 papers
Machine-learning surrogate models for nonlinear energetic-particle transport predictions in ITER
Yashika Ghai, Donald A. Spong, Jacobo Varela +1
Fast and accurate prediction of energetic-particle transport driven by Alfvén eigenmode (AE) instabilities is essential for integrated modeling workflows used in the design and opt…
Effect of the neutral beam injector operational regime on the Alfven eigenmode saturation phase in DIII-D plasma
J Varela, D A Spong, L Garcia +11
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 anal…
Analysis of the ECH effect on the EPM/AEs stability in Heliotron J plasma using a Landau closure model
J. Varela, K. Nagasaki, S. Kobayashi +9
The aim of the present study is to analyze the effect of the electron cyclotron heating (ECH) on the linear stability of Alfven Eigenmodes (AE) and energetic particle modes (EPM) t…
Simulation of the TAEs saturation phase in Large Helical Device device: MHD burst
J. Varela, D. A. Spong, Y. Todo +4
The aim of the present study is to analyze the saturation regime of the Toroidal Alfven Eigenmodes (TAE) in the LHD plasma, particularly the MHD burst. The linear and nonlinear evo…
Theoretical study of the Alfven Eigenmode stability in CFETR steady state discharges
J. Varela, J. Huang, D. A. Spong +6
The aim of this study is to analyze the stability of Alfven Eigenmodes (AE) in the China Fusion Engineering Test Reactor (CFETR) plasma for steady state operations. The analysis is…
Theoretical analysis of the saturation phase of the energetic-ion-driven resistive interchange mode
J. Varela, D. A. Spong, L. Garcia +4
The aim of the present study is to analyze the saturation regime of the energetic-ion-driven resistive interchange mode (EIC) in the LHD plasma. A set of non linear simulations are…
Study of the Alfven Eigenmodes stability in CFQS plasma using a Landau closure model
J. Varela, A. Shimizu, D. A. Spong +2
The aim of this study is to analyze the stability of the Alfven eigenmodes (AE) in the Chinese First Quasi-axisymmetric Stellarator (CFQS). The AE stability is calculated using the…
Theoretical analysis of energetic-ion-driven resistive interchange mode stabilization strategies using a Landau closure model
J. Varela, S. Ohdachi, K. Y. Watanabe +3
The aim of the present study is to perform a theoretical analysis of different strategies to stabilize energetic-ion-driven resistive interchange mode (EIC) in LHD plasma. We use a…
Modeling of the ECCD injection effect on the Heliotron J and LHD plasma stability
J. Varela, K. Nagasaki, K. Nagaoka +6
The aim of the study is to analyze the stability of the Energetic Particle Modes (EPM) and Alfven Eigenmodes (AE) in Helitron J and LHD plasma if the electron cyclotron current dri…
MHD stability of JT-60SA operation scenarios driven by passing energetic particles for a hot Maxwellian model
J. Varela, K. Y. Watanabe, K. Shinohara +5
We analyze the effects of the passing energetic particles on the resistive ballooning modes (RBM) and the energetic particle driven modes in JT-60SA plasma, which leads to the pred…
Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma
J. Varela, W. A. Cooper, K. Nagaoka +5
The aim of the present study is to analyze the stability of the pressure gradient driven modes (PM) and Alfven eigenmodes (AE) in the Large Helical Device (LHD) plasma if the rotat…
Study of Alfven Eigenmodes stability in plasma with multiple NBI driven energetic particle specie
J. Varela, D. A. Spong, L. Garcia +3
The aim of this study is to analyze the destabilization of Alfven Eigenmodes (AE) by multiple energetic particles (EP) species in DIII-D and LHD discharges. We use the reduced MHD…
Analysis of Alfven Eigenmode destabilization in ITER using a Landau closure model
J. Varela, D. A. Spong, L. Garcia
Alfven Eigenmodes (AE) can be destabilized during ITER discharges driven by neutral beam injection (NBI) energetic particles (EP) and alpha particles. The aim of the present study…
Analysis of the MHD stability and energetic particles effects on EIC events in LHD plasma using a Landau-closure model
J. Varela, D. A. Spong, L. Garcia +3
The aim of this study is to perform a theoretical analysis of the magnetohydrodynamic (MHD) stability and energetic particle effects on a LHD equilibria, calculated during a discha…
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations
J. Varela, D. A. Spong, M. Murakami +4
Alfven Eigenmodes and magneto-hydrodynamic modes are destabilized in DIII-D reverse magnetic shear configurations and may limit the performance of the device. We use the reduced MH…
Analysis of Alfven Eigenmode destabilization in DIII-D high poloidal discharges using a Landau closure model
J. Varela, D. A. Spong, L. Garcia +11
Alfven Eigenmodes are destabilized at the DIII-D pedestal during transient beta drops in high poloidal beta discharges with internal transport barriers (ITBs), driven by n=1 extern…
Analysis of Alfven Eigenmodes destabilization by energetic particles in TJ-II using a Landau-closure model
J. Varela, D. Spong, L. Garcia
Alfven Eigenmodes (AE) can be destabilized by energetic particles in neutral beam injection (NBI) heated plasmas through inverse Landau damping and couplings with gap modes in the…
Analysis of Alfven Eigenmodes destabilization by energetic particles in Large Helical Device using a Landau-closure model
J. Varela, D. A. Spong, L. Garcia
Energetic particle populations in nuclear fusion experiments can destabilize Alfv\' en Eigenmodes through inverse Landau damping and couplings with gap modes in the shear Alfv\' en…
The internal disruption as hard MHD limit of 1/2 sawtooth like activity in Large Helical Device
J. Varela, K. Y. Watanabe, S. Ohdachi
LHD inward-shifted configurations are unstable to resistive MHD pressure-gradient-driven modes. Sawtooth like activity was observed during LHD operation. The main drivers are the u…
Internal disruptions and sawtooth like activity in LHD
J. Varela, L. Garcia, S. Ohdachi +2
LHD inward-shifted configurations are unstable to resistive MHD pressure-gradient-driven modes. These modes drive sawtooth like events during LHD operation. In this work, we simula…
J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
N. Benitez, R. Dupke, M. Moles +149
The Javalambre-Physics of the Accelerated Universe Astrophysical Survey (J-PAS) is a narrow band, very wide field Cosmological Survey to be carried out from the Javalambre Observat…