Accès ouvert
2026
article
OpenAlex
L. Horváth, Florian Laggner, R. Gerrú, F. Scotti et autres
Abstract Understanding poloidal asymmetries in main chamber neutral fueling is essential for characterizing the balance between particle sources and transport in the formation of the H-mode density pedestal. The primary goal of this work is to study changes in these fueling asymmetries …
us
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Accès ouvert
2026
article
OpenAlex
Quinn Pratt, S. R. Haskey, George Wilkie, L. Horváth et autres
Abstract Measurements from multiple diagnostics are combined to constrain the density of neutrals in the confined plasma and improve our understanding of edge particle sources. Passive D α emission spectrum measurements are obtained along tangential views at the plasma midplane and near …
us, fi
(code pays fourni par la source)
Accès ouvert
2026
article
OpenAlex
Quinn Pratt, S. R. Haskey, T. Odstrčil, George Wilkie et autres
Abstract New spectroscopic measurements of deuterium Balmer- α emission are used to infer the spatial distribution of neutral particles near the X -point in a diverted high confinement mode plasma. The charge exchange neutral spectroscopy (CENS) diagnostic—recently installed on the DIII-D tokamak—uses …
us
(code pays fourni par la source)
2025
article
OpenAlex
Eric D. Emdee, L. Horváth, A. Bortolon, R. Gerrú et autres
Coupled 2D fluid-kinetic simulations of a DIII-D high confinement tokamak plasma show that plasma rotation coupled with drift effects near the plasma edge play a significant role in the creation of the observed poloidal distribution of neutrals. It is observed that including …
us
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Accès ouvert
2025
article
OpenAlex
Robert S. Wilcox, M.W. Shafer, Jeremy D. Lore, John M. Canik et autres
Abstract An experimental discharge from the DIII-D tokamak is modeled using the SOLPS-ITER code suite and compared against measurements in the pumped and relatively closed upper divertor. Uncertainties of boundary plasma simulations are identified by attempting to match code inputs to experimental …
us, au
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
A. Kleiner, K. Imada, F. Ebrahimi, Nathaniel M. Ferraro et autres
Abstract We investigate how non-ideal-magnetohydrodynamics (MHD) effects, in particular plasma resistivity, impact the peeling–ballooning stability thresholds in spherical tokamaks. This analysis follows the discovery of resistive kink-peeling modes in ELMing National Spherical Torus Experiment (NSTX) discharges. In the present study we extend …
us, gb
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2024
article
OpenAlex
S. R. Haskey, C. Chrystal, A. M. Angulo, A. Bortolon et autres
A 16 channel spectroscopy system has been installed on DIII-D to provide information about the energy distribution of the atomic neutrals using the Doppler shift and broadening of passive Balmer-α emission. The lines of sight are dominantly in the toroidal direction, with …
us
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Accès ouvert
2024
article
OpenAlex
Lothar Schmitz, Quinn Pratt, Troy A. Carter, Guiding Wang et autres
Abstract It is determined that while heat flux differences between hydrogen and deuterium isotope experiments result from natural differences in carbon impurity content at DIII-D, it is not the origin of the low to high confinement mode (L-H) transition isotope effect. More …
us, au
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Accès ouvert
2024
article
OpenAlex
C. T. Holcomb, Joseph Abbate, Alfredo Abe, A. Abrams et autres
Abstract The DIII-D tokamak has elucidated crucial physics and developed projectable solutions for ITER and fusion power plants in the key areas of core performance, boundary heat and particle transport, and integrated scenario operation, with closing the core-edge integration knowledge gap being …
us, no, jp, de, gb, nl, fr, cn, kr
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Accès ouvert
2024
article
OpenAlex
A. Marinoni, Max E. Austin, Jeff Candy, C. Chrystal et autres
Abstract Nonlinear gyrokinetic simulations correctly predict particle as well as ion and electron energy fluxes of high confinement plasmas with a negative triangularity cross sectional shape, showing that core transport in these plasmas is well described by standard gyrokinetic models. Experimentally inferred …
us, au
(code pays fourni par la source)
Accès ouvert
2024
article
OpenAlex
Darin R. Ernst, A. Bortolon, C. S. Chang, S. Ku et autres
Multimachine empirical scaling predicts an extremely narrow heat exhaust layer in future high magnetic field tokamaks, producing high power densities that require mitigation. In the experiments presented, the width of this exhaust layer is nearly doubled using actuators to increase turbulent transport …
us
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Accès ouvert
2024
article
OpenAlex
Zhenhong Yan, G. R. McKee, Jamie Xia, Xiang Jian et autres
Abstract A series of dedicated experiments from the DIII-D tokamak provide spatially and temporally resolved measurements of electron density and temperature, and multiscale and multichannel fluctuations over a wide range of conditions. Measurements of long wavelength density fluctuations in the type-I ELMing …
us, cn, au
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