Výsledky vyhledávání - "M. S. Chance"

Calculation of the vacuum Green’s function valid even for high toroidal mode numbers in tokamaks

Autor: M. S. Chance, A. D. Turnbull, P. B. Snyder

Publikováno v: Journal of Computational Physics. 221:330-348

The present evaluation of the Green's function used for the magnetic scalar potential in vacuum calculations for axisymmetric geometry has been found to be deficient even for moderately high, n, the toroidal mode number. This is relevant to the edge

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6eb20989fd6e2ca60276da9f070b2309
https://doi.org/10.1016/j.jcp.2006.06.025

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Critical β analyses with ferromagnetic and plasma rotation effects and wall geometry for a high 𝛃 steady state tokamak

Autor: Makoto Matsukawa, Ming-Sheng Chu, Y. Miura, S. Sakurai, Masafumi Azumi, Takahisa Ozeki, Hiroshi Tamai, G.A. Navratil, S. Ishida, T. Tuda, J.M. Bialek, G. Kurita, M. S. Chance

Publikováno v: Nuclear Fusion. 46:383-390

The critical beta, which is limited by an external kink mode with Alfven wave time scale, is shown to be decreased by ferromagnetic effect by about 8% for μ/μ0 ~ 2 where μ and μ0 denote the permeability of a ferromagnetic wall and vacuum, respect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a89cc940057c756e5d0b65cf3de7f624
https://doi.org/10.1088/0029-5515/46/2/020

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Control of the resistive wall mode with internal coils in the DIII–D tokamak

Publikováno v: Nuclear Fusion. 45:1715-1731

Internal coils, 'I-Coils', were installed inside the vacuum vessel of the DIII-D device to generate non-axisymmetric magnetic fields to act directly on the plasma. These fields are predicted to stabilize the resistive wall mode (RWM) branch of the lo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cfb9f8c9fb80033da2e8b10c4e1aba4b
https://doi.org/10.1088/0029-5515/45/12/028

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Measurement of resistive wall mode stability in rotating high-β DIII-D plasmas

Publikováno v: Nuclear Fusion. 45:368-376

Toroidal plasma rotation of the order of a few per cent of the Alfven velocity can stabilize the resistive wall mode (RWM) and extend the operating regime of tokamaks from the conventional, ideal magnetohydrodynamic (MHD) no-wall limit up to the idea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48a62b37cd1656f7f9ae8c8c10d5e9b6
https://doi.org/10.1088/0029-5515/45/5/007

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Resistive wall mode stabilization with internal feedback coils in DIII-D

Publikováno v: Physics of Plasmas. 11:2505-2513

A set of twelve coils for stability control has recently been installed inside the DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] vacuum vessel, offering faster time response and a wider range of applied mode spectra than the previous external coi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a2e1fc6d8ea9bd42a5b7af2a76dd086
https://doi.org/10.1063/1.1666238

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Modeling of feedback and rotation stabilization of the resistive wall mode in tokamaks

Autor: Ming-Sheng Chu, A.M. Garofalo, L.L. Lao, G.L. Jackson, Yueqiang Liu, R.J. La Haye, J. T. Scoville, E. J. Strait, H. Remierdes, G.A. Navratil, Anders Bondeson, M. S. Chance, Alan H. Glasser, M. Okabayashi

Publikováno v: Physics of Plasmas. 11:2497-2504

Steady-state operation of the advanced tokamak reactor relies on maintaining plasma stability with respect to the resistive wall mode ~RWM!. Active magnetic feedback and plasma rotation are the two methods proposed and demonstrated for this purpose.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4df5b15f4ed8b40fe12329ffa3fc5dde
https://doi.org/10.1063/1.1652876

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Normal mode approach to modelling of feedback stabilization of the resistive wall mode

Autor: M. Okabayashi, Alan H. Glasser, Ming-Sheng Chu, M. S. Chance

Publikováno v: Nuclear Fusion. 43:441-454

Feedback stabilization of the resistive wall mode (RWM) of a plasma in a general feedback configuration is formulated in terms of the normal modes of the plasma-resistive wall system. The growth/damping rates and the eigenfunctions of the normal mode

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::594a008883bd1d14d312084ee69a9647
https://doi.org/10.1088/0029-5515/43/6/307

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Modelling of feedback and rotation stabilization of the resistive wall mode in tokamaks

Publikováno v: Nuclear Fusion. 43:196-201

This paper describes the modelling of the feedback control and rotational stabilization of the resistive wall mode (RWM) in tokamaks. A normal mode theory for the feedback stabilization of the RWM has been developed for an ideal plasma with no toroid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::871345aab0a8a37f5da22de92fad743a
https://doi.org/10.1088/0029-5515/43/3/305

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Stabilization of the resistive wall mode in DIII–D by plasma rotation and magnetic feedback

Autor: M Okabayashi, J Bialek, M S Chance, M S Chu, E D Fredrickson, A M Garofalo, R Hatcher, T H Jensen, L C Johnson, R J La Haye, G A Navratil, H Reimerdes, J T Scoville, E J Strait, A D Turnbull, M L Walker, the DIII–D Team

Publikováno v: Plasma Physics and Controlled Fusion. 44:B339-B355

Suppression of the resistive wall mode (RWM) has been successfully demonstrated in the DIII–D tokamak by using rotational stabilization in conjunction with a close-fitting vacuum vessel wall. The duration of the high-pressure discharge was extended

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2d187b1af348d6f23cbfe86e915b7e2b
https://doi.org/10.1088/0741-3335/44/12b/324

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Predictive capability of MHD stability limits in high performance DIII-D discharges

Publikováno v: Nuclear Fusion. 42:917-932

Results from an array of theoretical and computational tools developed to treat the instabilities of most interest for high performance tokamak discharges are described. The theory and experimental diagnostic capabilities have now been developed to t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91cf30ed2f49c65853ee235a9b633a8e
https://doi.org/10.1088/0029-5515/42/7/315

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