Zobrazeno 1 - 10
of 351
pro vyhledávání: '"J.D. Callen"'
Publikováno v:
Nuclear Fusion, Vol 64, Iss 10, p 106036 (2024)
Plasma differential rotation is found to be capable of preventing disruptive neoclassical tearing modes (NTMs) seeded by nonlinear three-wave coupling. As tearing modes degrade confinement and can lead to disruptions, stabilization strategies are cru
Externí odkaz:
https://doaj.org/article/d85bcb5cd819470b914b133974c6b7d3
Publikováno v:
Nuclear Fusion, Vol 63, Iss 9, p 096021 (2023)
We report the first preemptive direct stabilization of $m,n = 2,1$ neoclassical tearing modes (NTMs) in DIII-D low-torque ITER baseline scenario plasmas by electron cyclotron waves. These experiments strongly support that the observed stabilization i
Externí odkaz:
https://doaj.org/article/1ba1b9df3cd642bca89d0bbd9e7011bc
Akademický článek
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Autor:
J.D. Callen, M. Zabiego
Publikováno v:
Nuclear Fusion. 37:361-370
The non-linear evolution of low mode number tearing modes is analysed, emphasizing the need for a threshold condition, to account for observations in tokamaks. The discussion is illustrated by two models recently introduced in the literature. The mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::769c8582ca44153f27d058d51b777742
https://doi.org/10.1088/0029-5515/37/3/i06
https://doi.org/10.1088/0029-5515/37/3/i06
Publikováno v:
Nuclear Fusion. 36:1307-1315
The response of the toroidal flow velocity to being abruptly locked in the vicinity of a magnetohydrodynamic (MHD) tearing-mode-induced magnetic island is examined analytically and numerically using a diffusive transport model in a cylindrical plasma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ee92d1040dfec32f38314525c062f12
https://doi.org/10.1088/0029-5515/36/10/i04
https://doi.org/10.1088/0029-5515/36/10/i04
Autor:
J.D. Callen, J.F. Schivell, R. A. Hulse, D. K. Mansfield, G. Taylor, E. J. Synakowski, Hyeon K. Park, P. C. Efthimion, E.D. Fredrickson, C. E. Bush, S. D. Scott, M. C. Zarnstorff, Michael W Kissick, Z. Chang
Publikováno v:
Nuclear Fusion. 34:349-358
A new method for obtaining a transient ('pulse') electron heat diffusivity (χep) in the radial region 0.38 < r/a < 0.56 in TFTR L mode discharges is presented. Small electron temperature perturbations were caused by single bursts of injected impurit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f415bf0e8f4f78b1d2972d0278628a7d
https://doi.org/10.1088/0029-5515/34/3/i03
https://doi.org/10.1088/0029-5515/34/3/i03
Publikováno v:
Nuclear Fusion. 34:231-246
Momentum and heat friction forces between fast ions (isotropic to the lowest order in the fast-ion rest frame) and thermal bulk plasma species (near Maxwellian) have been derived analytically for the first time using the linearized Fokker-Planck coll
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a294819710db4db0ffc542366826e3d
https://doi.org/10.1088/0029-5515/34/2/i06
https://doi.org/10.1088/0029-5515/34/2/i06
Akademický článek
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Autor:
J.D. Callen, Z. Chang
Publikováno v:
Nuclear Fusion. 30:219-233
Models are developed for estimating the effects of macroscopic phenomena in tokamaks (sawteeth, Mirnov oscillations, edge localized modes (ELMs), etc.) on plasma global energy confinement. The analysis is based on a recently developed formalism for d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf24eb06e40fc31aa912b9f3b204e8cf
https://doi.org/10.1088/0029-5515/30/2/003
https://doi.org/10.1088/0029-5515/30/2/003