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Assessment of Trans...
Assessment of Transport in NCSX
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Mikkelsen, D.R (författare)
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Maassberg, H. (författare)
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Zarnstorf, M.C. (författare)
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visa fler...
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Beidler, C.D. (författare)
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Houlberg, W.A. (författare)
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Kernbichler, W. (författare)
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Mynick, H. (författare)
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Spong, D.A. (författare)
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- Strand, Pär, 1968 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Tribaldos, V. (författare)
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visa färre...
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(creator_code:org_t)
- 2007
- 2007
- Engelska.
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Ingår i: Fusion Science and Technology. ; 51, s. 166-180
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- We explore whether the energy confinement and planned heating in the National Compact Stellarator Experiment (NCSX) are sufficient to test magnetohydrodynamic (MHD) stability limits, and whether the configuration is sufficiently quasi-axisymmetric to reduce the neoclassical ripple transport to low levels, thereby allowing tokamak-like transport. A zero-dimensional model with fixed profile shapes is related to global energy confinement scalings for stellarators and tokamaks, neoclassical transport properties are assessed with the DKES, NEO, and NCLASS codes, and a power balance code is used to predict temperature profiles. Reaching the NCSX goal of = 4% at low collisionality will require HISS-95 = 3, which is higher than the best achieved in present stellarators. However, this level of confinement is actually ~10% lower than that predicted by the ITER-97P tokamak L-mode scaling. By operating near the stellarator density limit, the required HISS-95 is reduced by 35%. The high degree of quasi-axisymmetry of the configuration and the self-consistent "ambipolar" electric field reduce the neoclassical ripple transport to a small fraction of the neoclassical axisymmetric transport. A combination of neoclassical and anomalous transport models produces pressure profile shapes that are within the range of those used to study the MHD stability of NCSX. We find that = 4% plasmas are "neoclassically accessible" and are compatible with large levels of anomalous transport in the plasma periphery.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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Mikkelsen, D.R
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Maassberg, H.
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Zarnstorf, M.C.
-
Beidler, C.D.
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Houlberg, W.A.
-
Kernbichler, W.
-
visa fler...
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Mynick, H.
-
Spong, D.A.
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Strand, Pär, 196 ...
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Tribaldos, V.
-
visa färre...
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