Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Chris Hegna"'
Publikováno v:
Journal of Plasma Physics, 87, 905870311
Kinetic-ballooning-mode (KBM) turbulence is studied via gyrokinetic flux-tube simulations in three magnetic equilibria that exhibit small average magnetic shear: the Helically Symmetric eXperiment (HSX), the helical-axis Heliotron-J and a circular to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e6ffd0cf03ffc9085f5ed3d7d357108
https://doi.org/10.1017/s0022377821000581
https://doi.org/10.1017/s0022377821000581
Autor:
Eric Howell, Chris Hegna, M. Okabayashi, James D. Callen, Robert J. La Haye, Colin Chrystal, E. J. Strait, Robert Wilcox
Publikováno v:
Nuclear Fusion. 62:056017
New studies identify the critical parameters and physics governing disruptive neoclassical tearing mode (NTM) onset. An m/n = 2/1 mode in DIII-D that begins to grow robustly after a seeding event (edge localized mode ELM or sawtooth precursor and cra
Autor:
Andrew Ware, Chris Hegna, Michael Drevlak, B. J. Faber, Matt Landreman, I. J. McKinney, Paul Terry, J.C. Schmitt, J. M. Schroeder, Thomas Kruger, Heinke Frerichs, Aaron Bader, J. M. Duff, David G. Anderson, Luquant Singh
Publikováno v:
Journal of Plasma Physics
A new optimized quasi-helically symmetric configuration is described that has the desirable properties of improved energetic particle confinement, reduced turbulent transport by three-dimensional shaping and non-resonant divertor capabilities. The co
Autor:
Matt Landreman, S. A. Henneberg, J.C. Schmitt, Chris Hegna, Aaron Bader, Michael Drevlak, Benjamin Faber, Yasuhiro Suzuki, Andrew Ware, David G. Anderson
Publikováno v:
Nuclear Fusion
Nine stellarator configurations, three quasiaxisymmetric, three quasihelically symmetric and three non-quasisymmetric are scaled to ARIES-CS size and analyzed for energetic particle content. The best performing configurations with regard to energetic
Publikováno v:
Physics of Plasmas. 28:082503
In this work, continuum kinetic formulations are employed as a mechanism to include closure physics in an extended magnetohydrodynamics model. Two continuum kinetic approaches have been implemented in the plasma fluid code NIMROD [Sovinec et al., “
Autor:
B. J. Faber, Michael Drevlak, Aaron Bader, Konstantin Likin, J.C. Schmitt, David G. Anderson, Joseph Talmadge, Chris Hegna
Publikováno v:
Journal of Plasma Physics. 85
Stellarator configurations with reactor relevant energetic particle losses are constructed by simultaneously optimizing for quasisymmetry and an analytically derived metric ( $\unicode[STIX]{x1D6E4}_{c}$ ), which attempts to align contours of the sec
Autor:
B. J. Faber, Chris Hegna, H. Mynick, I. J. McKinney, Pavlos Xanthopoulos, M. J. Pueschel, Joseph Talmadge, David G. Anderson
Publikováno v:
Journal of Plasma Physics
Ion-temperature-gradient-driven (ITG) turbulence is compared for two quasi-symmetric (QS) stellarator configurations to determine the relationship between linear growth rates and nonlinear heat fluxes. We focus on the quasi-helically symmetric (QHS)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69a34634a94de161525188491f0d1bf2
https://hdl.handle.net/21.11116/0000-0005-44C3-221.11116/0000-0005-C54B-921.11116/0000-0005-4E44-8
https://hdl.handle.net/21.11116/0000-0005-44C3-221.11116/0000-0005-C54B-921.11116/0000-0005-4E44-8
Autor:
F. Mink, E. Strumberger, W. Suttrop, M. Cavedon, Chris Hegna, M. Willensdorfer, M. Griener, A. Kirk, Matthias Hoelzl, F. Orain, R. Fischer, E. Seliunin, J. Galdon-Quiroga, T. B. Cote, H. Zohm, M. G. Dunne, N. Leuthold, S. S. Denk, M. Maraschek, Nengchao Wang, C. J. Ham, D. A. Ryan
Publikováno v:
Plasma Physics and Controlled Fusion
The impact of three-dimensional (3D) tokamak geometry from external magnetic perturbations on edge instabilities has been examined in high confinement mode plasmas with edge localised modes (ELMs) in ASDEX Upgrade. The 3D geometry has been probed usi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::685d61b531a6c9c603b5254a7cc576c6
http://hdl.handle.net/10281/354967
http://hdl.handle.net/10281/354967
Publikováno v:
Nuclear Fusion
Recent experimental observations have found toroidally localized MHD instabilities in the plasma edge during operation with applied magnetic perturbations on ASDEX Upgrade in H-mode with low collisionality . Large edge plasma displacements are induce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06b4480b5a5a9af7d60bfeece44539d2
https://hdl.handle.net/21.11116/0000-0002-C47D-521.11116/0000-0002-C47F-321.11116/0000-0002-E7CC-4
https://hdl.handle.net/21.11116/0000-0002-C47D-521.11116/0000-0002-C47F-321.11116/0000-0002-E7CC-4
Publikováno v:
Plasma Physics Reports. 42:440-449
An analytic approach combining the effect of equilibrium diamagnetic flows and the finite ionsound gyroradius associated with electron−ion decoupling and kinetic Alfven wave dispersion is derived to study resistive drift instabilities in a plasma s