Recent advances in the design of quasiaxisymmetric stellarator plasma configurations

A. Reiman, L. Ku, D. Monticello, S. Hirshman, S. Hudson, C. Kessel, E. Lazarus, D. Mikkelsen, M. Zarnstorff, L. A. Berry, A. Boozer, A. Brooks, W. A. Cooper, M. Drevlak, E. Fredrickson, G. Fu, Robert James Goldston, R. Hatcher, M. Isaev, C. JunS. Knowlton, J. Lewandowski, Z. Lin, J. F. Lyon, P. Merkel, M. Mikhailov, W. Miner, H. Mynick, G. Neilson, B. E. Nelson, C. Nührenberg, N. Pomphrey, M. Redi, W. Reiersen, P. Rutherford, R. Sanchez, J. Schmidt, D. Spong, D. Strickler, A. Subbotin, P. Valanju, R. White

Research output: Contribution to journalConference articlepeer-review

38 Scopus citations

Abstract

Strategies for the improvement of quasiaxisymmetric stellarator configurations are explored. Calculations of equilibrium flux surfaces for candidate configurations are also presented. One optimization strategy is found to generate configurations with improved neoclassical confinement, simpler coils with lower current density, and improved flux surface quality relative to previous designs. The flux surface calculations find significant differences in the extent of islands and stochastic regions between candidate configurations. (These calculations do not incorporate the predicted beneficial effects of perturbed bootstrap currents.) A method is demonstrated for removing low order islands from candidate configurations by relatively small modifications of the configuration. One configuration is identified as having particularly desirable properties for a proposed experiment.

Original languageEnglish (US)
Pages (from-to)2083-2094
Number of pages12
JournalPhysics of Plasmas
Volume8
Issue number5 II
DOIs
StatePublished - May 2001
Event42nd Annual Meeting of the APS Division of Plasma Physics - Quebec, Que, Canada
Duration: Oct 23 2000Oct 27 2000

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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