Zobrazeno 1 - 10
of 602
pro vyhledávání: '"E.D Fredrickson"'
Autor:
E.D. Fredrickson
Publikováno v:
Nuclear Fusion, Vol 63, Iss 7, p 076006 (2023)
The spherical tokamak NSTX and the upgraded, higher toroidal field, NSTX-U, routinely create plasmas with large un-thermalized populations of super-Alfvénic fast ions. This population of non-thermal energetic ions excites a broad spectrum of Alfvén
Externí odkaz:
https://doaj.org/article/233289501688435fbdee58f381fc99c5
Publikováno v:
Nuclear Fusion. 62:106016
Theoretical and numerical study of Alfvén eigenmodes (AEs) in the sub-cyclotron frequency range explains the observed frequency scaling with beam parameters in experiments across different devices. Global Alfvén (GAEs) and compressional Alfvén eig
Autor:
E.D. Fredrickson, N.N. Gorelenkov, R.E. Bell, A. Diallo, B.P. LeBlanc, J. Lestz, M. Podestà, null the NSTX team
Publikováno v:
Nuclear Fusion. 61:086007
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Autor:
Francesca Turco, Mario Podesta, Kathreen Thome, E.D. Fredrickson, C.C. Petty, M. A. Van Zeeland, L. Bardoczi, D. Liu, Zhenzhen Ren, Guoyong Fu, William Heidbrink
Publikováno v:
Nuclear Fusion. 60:112009
Significant variations in MHD activity and fast-ion transport are observed in the DIIID high-beta, steady-state hybrid discharges with a mixture of Electron Cyclotron (EC) waves and Neutral Beam Injection (NBI). When Electron Cyclotron Heating (ECH)
Autor:
David R. Smith, E.D. Fredrickson, S.P. Gerhardt, Ahmed Diallo, W. Guttenfelder, D. J. Battaglia, Nathaniel Ferraro, R. Maingi, S.M. Kaye, R.E. Bell
Publikováno v:
Physics of Plasmas. 27:072511
The Enhanced Pedestal (EP) H-mode regime is an attractive wide-pedestal high-βp scenario for the National Spherical Torus Experiment Upgrade (NSTX-U) and next-step devices as it achieves enhanced energy confinement (H98y,2 > 1.5), large normalized p
Publikováno v:
Physics of Plasmas. 27:052505
This paper describes a study of the cross-correlations between edge fluctuations as seen in the gas puff imaging (GPI) diagnostic and low frequency coherent magnetic fluctuations (MHD) in H-mode plasmas in NSTX. The main new result was that large blo
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,
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
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