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Optimization of a mega-ampere spherical tokamak for beta-limit and confinement studies [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
38 pages : digital, PDF file
Additional Creators
University of Texas at Austin, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Recent favorable results on the START experiment have caused renewed interest in the potential of low aspect ratio tokamaks. To aid in designing a next-step spherical tokamak to study confinement scaling, high beta, and high normalized beta plasmas for minimal cost, the authors have developed a transport scaling and device optimization code. This code STOP, benchmarked against START, includes 10 empirical confinement scaling laws and essential tokamak physics such as stability limits. Parameters are optimized separately for each scaling law and physical goal. Using STOP the authors find for R/a = 1.2 to 2.0 one can achieve β{sub N} = 5, (β) = 31--44%, and easily study predicted confinement degradation with auxiliary heating with just two neutral beams (P{sub NB} < 3.5 MW) for I{sub p} ≥ 0.75 MA, and R₀ ≥ 0.6 m. In contrast, if one insists on using the nominal device parameters, i.e. I{sub p} = 1 MA and R₀ = 0.8 m, with each scaling law, achieving β{sub N} = 5 requires typically P{sub NB} ≈ 7.5 MW. They also conclude that while running D° → D⁺ increases τ{sub E} ≈ 25%, with τ{sub E} already uncertain by 2--3×, one incurs restricted machine access and compromised physics operation.
Report Numbers
E 1.99:doe/er/54241--145
E 1.99: frcr--464
frcr--464
doe/er/54241--145
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/01/1994.
"doe/er/54241--145"
" frcr--464"
"DE97005263"
Wootton, A.J.; Bravenec, R.V.; McCool, S.C.
Funding Information
FG03-94ER54241
View MARC record | catkey: 14744321