Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments

G. H. Neilson, A. H. Reiman, M. C. Zarnstorff, A. Brooks, G. Y. fu, Robert James Goldston, L. P. ku, Z. Lin, R. Majeski, D. A. Monticello, H. Mynick, N. Pomphrey, M. H. Redi, W. T. Reiersen, J. A. Schmidt, S. P. Hirshman, J. F. Lyon, L. A. Berry, B. E. Nelson, R. SanchezD. A. Spong, A. H. Boozer, W. H. Miner, P. M. Valanju, W. A. Cooper, M. Drevlak, P. Merkel, C. Nuehrenberg

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

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 [formula omitted] 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 [formula omitted] 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.

Original languageEnglish (US)
Pages (from-to)1911-1918
Number of pages8
JournalPhysics of Plasmas
Volume7
Issue number5
DOIs
StatePublished - May 2000

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Keywords

  • ASPECT RATIO
  • DESIGN
  • FEASIBILITY STUDIES
  • HIGH-BETA PLASMA
  • KINK INSTABILITY
  • MAGNETIC FIELD CONFIGURATIONS
  • PLASMA CONFINEMENT
  • STELLARATORS
  • TEARING INSTABILITY

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    Neilson, G. H., Reiman, A. H., Zarnstorff, M. C., Brooks, A., fu, G. Y., Goldston, R. J., ku, L. P., Lin, Z., Majeski, R., Monticello, D. A., Mynick, H., Pomphrey, N., Redi, M. H., Reiersen, W. T., Schmidt, J. A., Hirshman, S. P., Lyon, J. F., Berry, L. A., Nelson, B. E., ... Nuehrenberg, C. (2000). Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments. Physics of Plasmas, 7(5), 1911-1918. https://doi.org/10.1063/1.874015