Confinement studies of neutral beam heated discharges in TFTR
M. Murakami,V. Arunasalam,J. D. Bell,M. G. Bell,Manfred Bitter,W. R. Blanchard,F.P. Boody,N. Bretz,Robert Budny,C. E. Bush,J. D. Callen,Joseph L. Cecchi,Samuel Cohen,R. J. Colchin,S.K. Combs,J. Coonrod,S. L. Davis,D. Dimock,H. F. Dylla,P. C. Efthimion,L. C. Emerson,A. C. England,H.P. Eubank,R. J. Fonck,E.D. Fredrickson,Harold P. Furth,L. R. Grisham,S. von Goeler,Robert James Goldston,B. Grek,R. Groebner,R. J. Hawryluk,H. W. Hendel,K. W. Hill,D. L. Hillis,W. W. Heidbrink,R. A. Hulse,David W. Johnson,L. C. Johnson,R. Kaita,R. Kamperschroer,Stanley Kaye,S. J. Kilpatrick,H.W. Kugel,P. H. LaMarche,R. Little,C. H. Ma,Dennis M. Manos,D. K. Mansfield,M. McCarthy,R. T. McCann,D. C. McCune,K. McGuire,Dale Meade,S. S. Medley,S. L. Milora,D. R. Mikkelsen,D. Mueller,E. Nieschmidt,D. K. Owens,V. K. Pare,Hyeon K. Park,B. Prichard,A. T. Ramsey,David A Rasmussen,M. H. Redi,A. L. Roquemore,P.H. Rutherford,N. R. Sauthoff,J.F. Schivell,G. L. Schmidt,S. D. Scott,S. Sesnic,M. Shimada,J. E. Simpkins,J. Sinnis,F. Stauffer,J. D. Strachan,Brentley Stratton,G. D. Tait,G. Taylor,C. E. Thomas,H. H. Towner,M. Ulrickson,R. M. Wieland,J. B. Wilgen,M. Williams,K. L. Wong,S. Yoshikawa,K. M. Young,M. C. Zarnstorff,S. J. Zweben +91 more
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The TFTR tokamak has reached its original machine design specifications (Ip=2.5 MA and BT=5.2 T) by operating at low plasma current and low density (ne approximately=1*1019 m-3), high ion temperatures (9+or2 keV) and rotation speeds (7*105 m/s) have been achieved during injection.Abstract:
The TFTR tokamak has reached its original machine design specifications (Ip=2.5 MA and BT=5.2 T). Recently, the D degrees neutral beam heating power has been increased to 6.3 MW. By operating at low plasma current (Ip approximately=0.8 MA) and low density (ne approximately=1*1019 m-3), high ion temperatures (9+or-2 keV) and rotation speeds (7*105 m/s) have been achieved during injection. At the opposite extreme, pellet injection into high current plasmas has been used to increase the line-average density to 8*1019 m-3 and the central density to 1.6*1020 m-3. This wide range of operating conditions has enabled the authors to conduct scaling studies of the global energy confinement time in both ohmically and beam heated discharges as well as more detailed transport studies of the profile dependence.read more
Citations
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A new look at density limits in tokamaks
TL;DR: In this article, it is shown that this limit may be caused by a dramatic deterioration in core particle confinement occurring as the density limit boundary is approached, which can help explain the disruptions and Marfes that are associated with density limit.
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A comparative study of transport in stellarators and tokamaks
TL;DR: In this article, a comparative study of stellarators and tokamaks is presented, showing that the degradation of confinement with heating power is of the same order in both devices and it is difficult to explain it in terms of a diffusivity which depends on temperature or temperature gradient.
Journal ArticleDOI
Modelling of temperature profiles and transport scaling in auxiliary heated tokamaks
TL;DR: In this article, two local heat transport models, namely a heat pinch or excess temperature gradient model with constant coefficients and a non-linear heat diffusion coefficient (χ) model, were developed analytically in detail.
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Neutral beam heating of fusion plasmas
TL;DR: In this paper, the authors deal with the neutral beam heating of toroidal fusion plasmas and propose a definition of fusion processes, the hierarchy of confinement devices and heating methods.
Journal ArticleDOI
Confinement of angular momentum in divertor and limiter discharges in the Doublet III tokamak
TL;DR: In this paper, the scaling of angular momentum confinement time with plasma current and neutral beam power has been determined for both divertor and limiter discharges in Doublet III and showed that a single mechanism governs the transport of both energy and angular momentum in divertor discharges.
References
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Journal ArticleDOI
New techniques for calculating heat and particle source rates due to neutral beam injection in axisymmetric tokamaks
TL;DR: In this paper, a set of numerical techniques for calculating heat and particle source rates due to neutral beam injection in axisymmetric tokamaks is described, taking into account a number of significant, and normally neglected, effects.
Journal ArticleDOI
Energy confinement scaling in tokamaks: Some implications of recent experiments with ohmic and strong auxiliary heating
TL;DR: In this article, the authors reviewed the results from confinement scaling experiments on tokamaks with strong auxiliary heating and made an attempt to draw these results together into a low-density ohmic confinement scaling law, and a scaling law for confinement with auxiliary heating.
Journal ArticleDOI
Marfe: an edge plasma phenomenon
Bruce Lipschultz,Brian LaBombard,Earl Marmar,M.M. Pickrell,J. L. Terry,R. Watterson,S.M. Wolfe +6 more
TL;DR: In this paper, a tokamak edge phenomenon, dubbed the "marfe" (for multifaceted asymmetric radiation from the edge), is described, which is characterized by greatly increased radiation, density and density fluctuations, and decreased temperature in a relatively small volume at the inner major radius edge of the plasma.
Book ChapterDOI
An Empirical Approach to Tokamak Transport
TL;DR: In this paper, an overview of the important considerations related to particle and energy transport in a tokamak is presented, where the experimental data is analyzed in terms of the one dimensional magnetic field diffusion equation and the particle energy conservation equations.
Journal ArticleDOI
Effect of finite aspect ratio on the neoclassical ion thermal conductivity in the banana regime
Choong-Seock Chang,F. L. Hinton +1 more
TL;DR: In this article, the effect of finite aspect ratio on the ion thermal conductivity has been investigated and a simple correction to the expression of Hinton and Hazeltine is suggested.
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