Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Nikolai Gorelenkov"'
Autor:
Chang Liu, Stephen C. Jardin, Jian Bao, Nikolai Gorelenkov, Dylan P. Brennan, James Yang, Mario Podesta
The kinetic-MHD hybrid simulation approach for macroscopic instabilities in plasmas can be extended to include the kinetic effects of both thermal ions and energetic ions. The new coupling scheme includes synchronization of density and parallel veloc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::920c5c9c484b4aed9b3ad78af13dc6ec
Autor:
Mario Podesta, Roddy G. L. Vann, Eric Fredrickson, Nikolai Gorelenkov, Benjamin J. Q. Woods, Vinicius Duarte
Publikováno v:
IEEE Transactions on Plasma Science
Abrupt large events in the Alfvenic and sub-Alfvenic frequency bands in tokamaks are typically correlated with increased fast-ion loss. Here, machine learning is used to speed up the laborious process of characterizing the behavior of magnetic pertur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9741d5c23676e035b642c4999ab4b5b8
https://eprints.whiterose.ac.uk/156134/1/woods2020machine_final.pdf
https://eprints.whiterose.ac.uk/156134/1/woods2020machine_final.pdf
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
A method is developed to analytically determine the resonance broadening function in quasilinear theory from first principles, due to either Krook or Fokker-Planck scattering collisions of marginally unstable plasma systems where discrete resonance i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b1bb68a8bd18fb5873ae8b0686e2b0d
http://arxiv.org/abs/1906.01780
http://arxiv.org/abs/1906.01780
Autor:
Nikolai Gorelenkov, V.N. Duarte
Publikováno v:
Physics Letters A. 386:126944
New regimes of Alfven eigenmode (AE) induced fast ion transport in tokamak plasmas are reported, in which microturbulence plays the role of a mediator of fast ion relaxation. Coulomb collisional scattering alone leads to small AE amplitudes and does
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0aa67a5d012a473cd416a74da8ed0b76
https://doi.org/10.1016/j.physleta.2020.126944
https://doi.org/10.1016/j.physleta.2020.126944
Publikováno v:
Physics of Plasmas. 27:052108
In tokamak discharges, toroidal Alfven eigenmodes often experience complex semi-periodic frequency modulation known as chirping. These events modify the local high energy particle distribution and are expected to occur in many future fusion devices,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f533eace6c40f35628d9455fd6777a23
https://doi.org/10.1063/5.0004610
https://doi.org/10.1063/5.0004610
Publikováno v:
Physics of Plasmas. 27:022117
In some tokamak discharges, a number of Alfven eigenmodes (AEs) have been observed to cause a large-scale collapse of the high energy particle distribution, a phenomenon referred to as an avalanche. We examine the necessary conditions for an avalanch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::826b219174261cf993b65416cee36ddf
https://doi.org/10.1063/1.5136236
https://doi.org/10.1063/1.5136236
Autor:
Vinicius Duarte, Nikolai Gorelenkov
The nonlinear dynamics of isolated, near-threshold waves is studied in the presence of strong resonant particle scattering. In this limit, a simple closed-form analytical solution is found and compared with numerical simulations, which shows reasonab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::063ece10c8aa3533aeea45423207bd3a
http://arxiv.org/abs/1809.05971
http://arxiv.org/abs/1809.05971
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
Autor:
Roddy G. L. Vann, Nikolai Gorelenkov, Vinicius Duarte, Anthony P. De-Gol, Benjamin J. Q. Woods
Publikováno v:
Nuclear Fusion
The creation and subsequent evolution of marginally-unstable modes have been observed in a wide range of fusion devices. This behaviour has been successfully explained, for a single frequency shifting mode, in terms of phase-space structures known as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b418a20c20151d12722e840ac27d935f