Results 81 to 90 of about 3,492 (198)

HIPED: machine learning framework for spherical tokamak pedestal prediction and optimization

Nuclear Fusion
We introduce a machine learning framework, HIPED (HeIght and width Predictor for Edge Dynamics), for predicting and optimizing pedestal and core performance in spherical tokamak plasmas.
J.F. Parisi, J.G. Clark, J.W. Berkery, C. Bowman, C.J. Fitzpatrick, S.M. Kaye, M. Lampert   +6 more
doaj   +1 more source

Testing of the SOLPS-ITER code at Globus-M2 spherical tokamak with detached divertor

MATEC Web of Conferences, 2018
In according to a present understanding of Scrape-Off Layer (SOL) physics, future thermonuclear devices like ITER, DEMO and beyond, require high radiation regimes in order to reduce heat loads on tokamak divertor. Recent experiments at ASDEX Upgrade, JET
Sorokina Daria, Senichenkov Ilya, Vekshina Elena, Rozhansky Vladimir   +3 more
doaj   +1 more source

Nonlinear fishbone dynamics in spherical tokamaks

Nuclear Fusion, 2016
Abstract Linear and nonlinear kinetic-MHD hybrid simulations have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone instability in spherical tokamak plasmas. Realistic NSTX parameters with finite toroidal rotation were used.
Feng Wang, G.Y. Fu, Wei Shen
openaire   +2 more sources

Modeling electron temperature profiles in the pedestal with simple formulas for ETG transport

Nuclear Fusion
This paper reports on the refinement (building on (Hatch D.R. et al 2022 Phys. Plasmas 29 062501)) and application of simple formulas for electron heat transport from electron temperature gradient (ETG) driven turbulence in the pedestal. The formulas are
D.R. Hatch, M.T. Kotschenreuther, P.-Y. Li, B. Chapman-Oplopoiou, J. Parisi, S.M. Mahajan, R. Groebner   +6 more
doaj   +1 more source

Development of a data-driven neural network model for electron thermal transport in NSTX

Nuclear Fusion
A data-driven electron thermal transport neural network (ETT-NN) model, trained on TRANSP interpretative analysis results of National Spherical Torus Experiment (NSTX), was developed to enable faster and more accurate ETT computation for spherical ...
H. Chung, C.Y. Lee, G.J. Choi, S.M. Kaye, B.P. LeBlanc, J.W. Berkery, Y.-S. Na   +6 more
doaj   +1 more source

Observation of stationary filaments with resonant magnetic perturbations in NSTX

Nuclear Fusion
The application of resonant magnetic perturbations (RMPs) induces striated heat fluxes on the divertor plate in tokamaks. These striated heat fluxes were previously considered strike point splitting by the intersection between the divertor and predicted ...
K.F. Gan, E.D. Fredrickson, J.W. Berkery, S. Munaretto, A. Kleiner, M. Lampert, J.-K. Park, R. Maingi, A.G. McLean, T.K. Gray, B.D. Wirth   +10 more
doaj   +1 more source

Energetic particles in spherical tokamak plasmas

Plasma Physics and Controlled Fusion, 2017
Spherical tokamaks (STs) typically have lower magnetic fields than conventional tokamaks, but similar mass densities. Suprathermal ions with relatively modest energies, in particular beam-injected ions, consequently have speeds close to or exceeding the Alfven velocity, and can therefore excite a range of Alfvenic instabilities which could be driven by
K G McClements, E D Fredrickson
openaire   +2 more sources

The formation of an radial edge electric field due to finite ion orbit width effects is the possible root cause of the H-mode edge

Nuclear Fusion
Full orbit-following simulations of thermal ions show that finite ion-orbit width effects create charge separation near the last closed flux surface (LCFS) which generates a localized radial electric field.
G.J. Kramer, A. Bortolon, A. Diallo, R. Maingi   +3 more
doaj   +1 more source

Full orbit simulations of collisional impurity transport in spherical tokamak plasmas with strongly-sheared electric fields

, 2011
The collisional dynamics of test impurity ions in spherical tokamak plasmas with strongly-sheared radial electric fields is investigated by means of a test particle full orbit simulation code.
McClements, K. G., Verwichte, E., Wrench, C. G.   +2 more
core  

H-mode dithering phase studies on ST40. [PDF]

Philos Trans A Math Phys Eng Sci, 2023
Andrew Y, Bland J, Buxton P, Dnestrovskij A, Gryaznevich M, Kim EJ, Romanelli M, Sertoli M, Thomas P, Varje J.   +9 more
europepmc   +1 more source