Zobrazeno 1 - 10
of 205
pro vyhledávání: '"Herbert L. Berk"'
Autor:
Herbert L Berk, Nikolai Gorelenkov
Publikováno v:
Physics of Plasmas. 28:074701
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab91594ffad9c87abf18d2f7171b5dfe
https://doi.org/10.1063/5.0045198
https://doi.org/10.1063/5.0045198
Autor:
Nikolai Gorelenkov, Mario Podesta, M. Schneller, Vinicius Duarte, Herbert L Berk, E.D. Fredrickson
Rare Alfv\'enic wave transitions between fixed-frequency and chirping phases are identified in NSTX, where Alfv\'enic waves are normally observed to exhibit either chirping or avalanching responses. For those transitions, we apply a criterion [Duarte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b66a9ba904463fde32ac031e00c42a0
http://arxiv.org/abs/1802.06158
http://arxiv.org/abs/1802.06158
Publikováno v:
Physics of Plasmas
The precessional fishbone instability is an m = n = 1 internal kink mode destabilized by a population of trapped energetic particles. The linear phase of this instability is studied here, analytically and numerically, with a simplified model. This mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::736d6ee7be4eac76760e43feb243c7ff
https://hal.archives-ouvertes.fr/hal-01360957/document
https://hal.archives-ouvertes.fr/hal-01360957/document
Autor:
Mario Podesta, Herbert L Berk, Michael Van Zeeland, Benjamin Tobias, Raffi Nazikian, Vinicius Duarte, David Pace, Nikolai Gorelenkov, G. J. Kramer, William Heidbrink
Publikováno v:
Duarte, VN; Berk, HL; Gorelenkov, NN; Heidbrink, WW; Kramer, GJ; Nazikian, R; et al.(2017). Prediction of nonlinear evolution character of energetic-particle-driven instabilities. NUCLEAR FUSION, 57(5). doi: 10.1088/1741-4326/aa6232. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1nj5k5m9
A general criterion is proposed and found to successfully predict the emergence of chirping oscillations of unstable Alfv\'enic eigenmodes in tokamak plasma experiments. The model includes realistic eigenfunction structure, detailed phase-space depen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8dbdf9b493c415fa15a1d8344c1a094
Autor:
Ge Wang, Herbert L Berk
Publikováno v:
Communications in Nonlinear Science and Numerical Simulation. 17:2179-2190
We study the frequency chirping signals arising from spontaneously excited toroidial Alfven eigenmode (TAE) waves that are being driven by an inverted energetic particle distribution whose free energy is tapped from the generic particle/wave resonanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::142bac67200cc6514dcc68f4af80685f
https://doi.org/10.1016/j.cnsns.2011.08.001
https://doi.org/10.1016/j.cnsns.2011.08.001
Publikováno v:
Physics of Plasmas. 25:102504
Particle trajectory surfaces in an ideal magnetohydrodynamic high energy particle resonance are studied using kinetic Poincare plots and through a calculation by perturbing near the resonance and finding canonical variables in the resonance, allowing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b7515aed13d0850b76ff34d9a8657fe
https://doi.org/10.1063/1.5046655
https://doi.org/10.1063/1.5046655
Publikováno v:
Nuclear Fusion
Nuclear Fusion, IOP Publishing, 2018, 58 (8), pp.082012. ⟨10.1088/1741-4326/aab84a⟩
Nuclear Fusion, 2018, 58 (8), pp.082012. ⟨10.1088/1741-4326/aab84a⟩
Nuclear Fusion, IOP Publishing, 2018, 58 (8), pp.082012. ⟨10.1088/1741-4326/aab84a⟩
Nuclear Fusion, 2018, 58 (8), pp.082012. ⟨10.1088/1741-4326/aab84a⟩
International audience; We assess the quantitative accuracy of the Berk-Breizman (BB) cubic wave equation that has been previously derived to describe the initial nonlinear behavior of kinetic instabilities
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbf73548c8b7294eb60b59e3b96040a8
https://doi.org/10.1088/1741-4326/aab84a
https://doi.org/10.1088/1741-4326/aab84a
Publikováno v:
Nuclear Fusion. 58:082017
We use a guiding center code ORBIT to study the broadening of resonances and the parametric dependence of the resonance frequency broadening width $\Delta\Omega$ on the nonlinear particle trapping frequency $\omega_b$ of wave-particle interaction wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5686765539d9deba0b0cea93e8769c92
https://doi.org/10.1088/1741-4326/aaa918
https://doi.org/10.1088/1741-4326/aaa918
Publikováno v:
Physics of Plasmas. 25:022503
Coupled transport is the close interconnection between the cross-field and parallel fluxes in different regions due to topological changes in the magnetic field. This occurs because perpendicular transport is necessary for particles or energy to leav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a0bad233bce0d2dad1171f9206a4802
https://doi.org/10.1063/1.5011679
https://doi.org/10.1063/1.5011679