Results 71 to 80 of about 154 (149)

First global gyrokinetic profile predictions of ITER burning plasma

Nuclear Fusion
In this work, we present the first global gyrokinetic simulations of the ITER baseline scenario at 15 MA, performed using the GENE-Tango framework in both electrostatic and electromagnetic regimes.
A. Di Siena, C. Bourdelle, A. Bañón Navarro, G. Merlo, T. Görler, E. Fransson, A. Polevoi, S.H. Kim, F. Koechl, A. Loarte, E. Fable, C. Angioni, P. Mantica, F. Jenko   +13 more
doaj   +1 more source

Near-edge beta induced Alfven eigenmode in DIII-D high bootstrap current fraction plasmas

Nuclear Fusion
In DIII-D high bootstrap current fraction plasmas heated solely by neutral beam injection, a fast ion-driven Beta-Induced Alfven Eigenmode (BAE) is frequently observed.
X. Jian, C. Holland, V. Chan, Z. Qiu, E. Bass, S. Ding, X. Du, Y. Zou, A. Garofalo, G. Yu, J. McClenaghan   +10 more
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Understanding turbulence suppression in JET D–T plasma with highly energetic fast ions via global gyrokinetic GENE simulations

Nuclear Fusion
This study focuses on understanding how turbulence is suppressed in particularly heated JET plasma discharges showing enhanced confinement, namely $99896$ , which uses a nearly 50–50 deuterium–tritium mixture, showing signs of enhanced plasma confinement.
A. Di Siena, J. Garcia, G. Merlo, A. Bañón Navarro, F. Sheffield, E. Poli, A. Ishizawa, Ye.O. Kazakov, J. Varela, T. Görler, F. Jenko, JET Contributors, the EUROfusion Tokamak Exploitation Team   +12 more
doaj   +1 more source

Towards fully predictive gyrokinetic full-f simulations: validation and triangularity studies in TCV

Nuclear Fusion
Designing economical magnetic confinement fusion power plants motivates computational tools that can estimate plasma behavior from engineering parameters without direct reliance on experimental measurement of the plasma profiles. In this work, we present
A.C.D. Hoffmann, T.N. Bernard, M. Francisquez, G.W. Hammett, A. Hakim, J. Boedo, R. Rizkallah, C.K. Tsui, The TCV Team   +8 more
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Gyrokinetic microturbulence in transport barriers

, 2012
Modern fusion research aims at making the energy source of the sun accessible for electricity generation on earth. For this purpose, magnetically confined plasmas must be heated to very high temperatures of 100 million Kelvin. The resulting steep pressure gradients lead to turbulent mixing in the plasma, causing a drastic deterioration of particle and ...
openaire   +3 more sources

Multiscale turbulence in stellarators

Nuclear Fusion
We present the first gyrokinetic simulations of multiscale turbulence in a stellarator, using the magnetic geometry of Wendelstein 7-X (W7-X) and experimentally relevant parameters. A broad range of scenarios is explored, including regimes where electron-
G. Merlo, A. Bañón Navarro, T. Görler, F. Jenko, F. Wilms   +4 more
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Enhancing predictive capabilities in fusion burning plasmas through surrogate-based optimization in core transport solvers

Nuclear Fusion
This work presents the PORTALS framework (Rodriguez-Fernandez et al 2022 Nucl. Fusion 62 076036), which leverages surrogate modeling and optimization techniques to enable the prediction of core plasma profiles and performance with nonlinear gyrokinetic ...
P. Rodriguez-Fernandez, N.T. Howard, A. Saltzman, S. Kantamneni, J. Candy, C. Holland, M. Balandat, S. Ament, A.E. White   +8 more
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Reduction and approximation in gyrokinetics

, 2007
15 pages ...
Ghendrih, Philippe, Lima, Ricardo, Mendes, R. Vilela   +2 more
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Gyrokinetic linearized Landau collision operator [PDF]

Physical Review E, 2013
The full gyrokinetic electrostatic linearized Landau collision operator is calculated including the equilibrium operator, which represents the effect of collisions between gyrokinetic Maxwellian particles. First, the equilibrium operator describes energy exchange between different plasma species, which is important in multiple ion-species plasmas ...
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Kinetic-ballooning-limited pedestals in spherical tokamak plasmas

Nuclear Fusion
A theoretical model is presented that for the first time matches experimental measurements of the pedestal width-height Diallo scaling in the low-aspect-ratio high- β tokamak NSTX.
J.F. Parisi, W. Guttenfelder, A.O. Nelson, R. Gaur, A. Kleiner, M. Lampert, G. Avdeeva, J.W. Berkery, C. Clauser, M. Curie, A. Diallo, W. Dorland, S.M. Kaye, J. McClenaghan, F.I. Parra   +14 more
doaj   +1 more source