Physics Basis for High-Beta, Low-Aspect-Ratio Stellarator Experiments

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High-beta, low-aspect-ratio (compact) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady-state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2-4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A beta = 4% quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a ... continued below

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407 Kilobytes pages

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Brooks, A.; Reiman, A.H.; Neilson, G.H.; Zarnstorff, M.C. & al, et November 1, 1999.

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Description

High-beta, low-aspect-ratio (compact) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady-state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2-4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A beta = 4% quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a substantial bootstrap current and is shaped to stabilize ballooning, external kink, vertical, and neoclassical tearing modes without feedback or close-fitting conductors. Quasi-omnigeneous plasma configurations stable to ballooning modes at beta = 4% have been evaluated for the Quasi-Omnigeneous Stellarator (QOS) experiment. These equilibria have relatively low bootstrap currents and are insensitive to changes in beta. Coil configurations have been calculated that reconstruct these plasma configurations, preserving their important physics properties. Theory- and experiment-based confinement analyses are used to evaluate the technical capabilities needed to reach target plasma conditions. The physics basis for these complementary experiments is described.

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407 Kilobytes pages

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INIS; OSTI as DE00014960

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  • Other Information: PBD: 1 Nov 1999

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  • Report No.: PPPL-3397
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/14960 | External Link
  • Office of Scientific & Technical Information Report Number: 14960
  • Archival Resource Key: ark:/67531/metadc624826

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  • November 1, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 1:03 p.m.

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Brooks, A.; Reiman, A.H.; Neilson, G.H.; Zarnstorff, M.C. & al, et. Physics Basis for High-Beta, Low-Aspect-Ratio Stellarator Experiments, report, November 1, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc624826/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.