Search Results - "HUGHES, W. J"

Fast Low-to-High Confinement Mode Bifurcation Dynamics in a Tokamak Edge Plasma Gyrokinetic Simulation by Chang, C S, Ku, S, Tynan, G R, Hager, R, Churchill, R M, Cziegler, I, Greenwald, M, Hubbard, A E, Hughes, J W

“…Transport barrier formation and its relation to sheared flows in fluids and plasmas are of fundamental interest in various natural and laboratory observations…”
Get full text

Observation of edge instability limiting the pedestal growth in tokamak plasmas by Diallo, A, Hughes, J W, Greenwald, M, Labombard, B, Davis, E, Baek, S-G, Theiler, C, Snyder, P, Canik, J, Walk, J, Golfinopoulos, T, Terry, J, Churchill, M, Hubbard, A, Porkolab, M, Delgado-Aparicio, L, Reinke, M L, White, A, Alcator C-Mod Team

“…With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the…”
Get full text

Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions by Cziegler, I, Hubbard, A E, Hughes, J W, Terry, J L, Tynan, G R

“…A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new…”
Get full text

Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak by Baek, S G, Wallace, G M, Bonoli, P T, Brunner, D, Faust, I C, Hubbard, A E, Hughes, J W, LaBombard, B, Parker, R R, Porkolab, M, Shiraiwa, S, Wukitch, S

“…Efficient lower hybrid current drive (LHCD) is demonstrated at densities up to n[over ¯]_{e}≈1.5×10^{20}  m^{-3} in diverted plasmas on the Alcator C-Mod…”
Get full text

Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models by Rodriguez-Fernandez, P, White, A E, Howard, N T, Grierson, B A, Staebler, G M, Rice, J E, Yuan, X, Cao, N M, Creely, A J, Greenwald, M J, Hubbard, A E, Hughes, J W, Irby, J H, Sciortino, F

“…A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge…”
Get full text

Deep Electric Field Predictions by Drift-Reduced Braginskii Theory with Plasma-Neutral Interactions Based on Experimental Images of Boundary Turbulence by Mathews, A, Hughes, J W, Terry, J L, Baek, S G

“…We present two-dimensional turbulent electric field calculations via physics-informed deep learning consistent with (i) drift-reduced Braginskii theory under…”
Get full text

Solar Flares and Coronal Mass Ejections: A Statistically Determined Flare Flux – CME Mass Correlation by Aarnio, A. N., Stassun, K. G., Hughes, W. J., McGregor, S. L.

“…In an effort to examine the relationship between flare flux and corresponding CME mass, we temporally and spatially correlate all X-ray flares and CMEs in the…”
Get full text

Effects of nightside O+ outflow on magnetospheric dynamics: Results of multifluid MHD modeling by Garcia, K. S., Merkin, V. G., Hughes, W. J.

“…Through spacecraft observations and numerical modeling, it is becoming increasingly well established that ionospheric oxygen is present in the magnetosphere in…”
Get full text

Distribution of density along magnetospheric field lines by Denton, R. E., Takahashi, K., Galkin, I. A., Nsumei, P. A., Huang, X., Reinisch, B. W., Anderson, R. R., Sleeper, M. K., Hughes, W. J.

“…This paper examines the field line distribution of magnetospheric electron density and mass density. The electron density distributions from IMAGE RPI active…”
Get full text

Formation and stability of impurity "snakes" in tokamak plasmas by Delgado-Aparicio, L, Sugiyama, L, Granetz, R, Gates, D A, Rice, J E, Reinke, M L, Bitter, M, Fredrickson, E, Gao, C, Greenwald, M, Hill, K, Hubbard, A, Hughes, J W, Marmar, E, Pablant, N, Podpaly, Y, Scott, S, Wilson, R, Wolfe, S, Wukitch, S

“…New observations of the formation and dynamics of long-lived impurity-induced helical "snake" modes in tokamak plasmas have recently been carried out on…”
Get full text

Analysis of the magnetic field discontinuity at the potential field source surface and Schatten Current Sheet interface in the Wang–Sheeley–Arge model by McGregor, S. L., Hughes, W. J., Arge, C. N., Owens, M. J.

“…The Wang–Sheeley–Arge solar wind model makes use of coupled potential field source surface (PFSS) and Schatten Current Sheet (SCS) models to reconstruct the…”
Get full text

Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework by Li, N. M., Xu, X. Q., Hughes, J. W., Terry, J. L., Sun, J. Z., Wang, D. Z.

“…The fluid transport code [trans-electric field (Er) module] under the BOUT++ framework has been used to simulate divertor heat flux width and boundary Er with…”
Get full text

A statistical study of the global structure of the ring current by Jorgensen, A. M., Spence, H. E., Hughes, W. J., Singer, H. J.

“…In this paper we derive the average configuration of the ring current as a function of the state of the magnetosphere as indicated by the Dst index. We sort…”
Get full text

Finding the Lyon-Fedder-Mobarry magnetopause: A statistical perspective by GARCIA, K. S, HUGHES, W. J

“…The determination of the location and global structure of the magnetopause is not a well‐defined problem, either in satellite data or in magnetohydrodynamic…”
Get full text

Role of coronal mass ejections in the heliospheric Hale cycle by Owens, M. J., Schwadron, N. A., Crooker, N. U., Hughes, W. J., Spence, H. E.

“…The 11-year solar cycle variation in the heliospheric magnetic field strength can be explained by the temporary buildup of closed flux released by coronal mass…”
Get full text

Divertor heat flux footprints in EDA H-mode discharges on Alcator C-Mod by LaBombard, B., Terry, J.L., Hughes, J.W., Brunner, D., Payne, J., Reinke, M.L., Lin, Y., Wukitch, S.

“…The physics that sets the width of the power exhaust channel in a tokamak scrape-off layer and its scaling with engineering parameters is of fundamental…”
Get full text

Reconfiguration timescales of ionospheric convection by Murr, D. L., Hughes, W. J.

“…Changes in ionospheric flow patterns provide direct observations of how the magnetosphere‐ionosphere system is coupled to the IMF. The nature and location of…”
Get full text

Solar wind drivers of Traveling Convection Vortices by Murr, D. L., Hughes, W. J.

“…We present the first clear and consistent evidence of solar wind drivers of Traveling Convection Vortices (TCVs). Using high time resolution data from GEOTAIL…”
Get full text

Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod by Zweben, S.J., Terry, J.L., LaBombard, B., Agostini, M., Greenwald, M., Grulke, O., Hughes, J.W., D’Ippolito, D.A., Krasheninnikov, S.I., Myra, J.R., Russell, D.A., Stotler, D.P., Umansky, M.

“…The convective radial transport effects of SOL turbulence have been estimated using recent turbulence data from the gas puff imaging (GPI) camera diagnostic on…”
Get full text

Response of the ionosphere to a density pulse in the solar wind: Simulation of traveling convection vortices by Slinker, S. P., Fedder, J. A., Hughes, W. J., Lyon, J. G.

“…We show the response of the Earth's magnetosphere and ionosphere to a density pulse in the solar wind using a global 3D MHD simulation model. Flow vortices are…”
Get full text