Physics design of a high-β quasi-axisymmetric stellarator

A. Reiman, G. Fu, S. Hirshman, L. Ku, D. Monticello, H. Mynick, M. Redi, D. Spong, M. Zarnstorff, B. Blackwell, A. Boozer, A. Brooks, W. A. Cooper, M. Drevlak, Robert James Goldston, J. Harris, M. Isaev, C. Kessel, Z. Lin, J. F. LyonP. Merkel, M. Mikhailov, W. Miner, N. Nakajima, G. Neilson, C. Nührenberg, M. Okamoto, N. Pomphrey, W. Reiersen, R. Sanchez, J. Schmidt, A. Subbotin, P. Valanju, K. Y. Watanabe, R. White

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Key physics issues in the design of a high-β quasi-axisymmetric stellarator configuration are discussed. The goal of the design study is a compact stellarator configuration with aspect ratio comparable to that of tokamaks and good transport and stability properties. Quasi-axisymmetry has been used to provide good drift trajectories. Ballooning stabilization has been accomplished by strong axisymmetric shaping, yielding a stellarator configuration whose core is in the second stability regime for ballooning modes. A combination of externally generated shear and non-axisymmetric corrugation of the plasma boundary provides stability to external kink modes even in the absence of a conducting wall. The resulting configuration is also found to be robustly stable to vertical modes, increasing the freedom to perform axisymmetric shaping. Stability to neoclassical tearing modes is conferred by a monotonically increasing ι profile. A gyrokinetic δf code has been used to confirm the adequacy of the neoclassical confinement. Neutral beam losses have been evaluated with Monte Carlo codes.

Original languageEnglish (US)
Pages (from-to)B273-B283
JournalPlasma Physics and Controlled Fusion
Issue numberSUPPL. 12B
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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