[Table of Contents]

Plasma and Fusion Research

Volume 5, S2039 (2010)

Regular Articles

New QP/QI Symmetric Stellarator Configurations
Donald A. SPONG and Jeffrey H. HARRIS
Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
(Received 21 December 2009 / Accepted 6 April 2010 / Published 10 December 2010)


A unique characteristic of the quasi-poloidal/isodynamic transport optimization strategy is that it can lead to stellarators that deviate from the usual “doughnut” shape; i.e., they can have extended relatively straight cylindrical sections of plasma (connected by corner regions). This offers a number of potential design advantages, including simplified coil geometries, novel divertor approaches, low bootstrap current (less potential for ELMs and disruptions), more acceptable wall heat fluxes, and demountable blankets for reactors. The STELLOPT approach has been used to develop optimized configurations of this type for two and four field periods with aspect ratio <R>/<a> in the range of 8 to 16.


stellarator, optimization, transport, quasi-symmetry, Shafranov shift, effective ripple

DOI: 10.1585/pfr.5.S2039


  • [1] S. P. Hirshman, D. A. Spong, J. C. Whitson et al., Phys. Plasmas 6, 1858 (1999).
  • [2] J. F. Lyon, B. E. Nelson, R. D. Benson et al., Fusion Eng. Des. 82, 575 (2007).
  • [3] S. R. Hudson, C. C. Hegna, R. Torasso and A. Ware, Plasma Phys. Control. Fusion 46, 869 (2004).
  • [4] A. Ware, S. P. Hirshman, D. A. Spong et al., Phys. Rev. Lett. 89, 125003-1 (2002).
  • [5] D. A. Spong, Phys. Plasmas 12, 056114 (2005).
  • [6] G. Rewoldt, L.-P. Ku and W. M. Tang, Phys. Plasmas 12, 102512 (2005).
  • [7] S. P. Hirshman and J. C. Whitson, Phys. Fluids 26, 3553 (1983).
  • [8] P. Merkel, Nucl. Fusion 27, 867 (1987).
  • [9] A. H. Boozer, Phys. Fluids 23, 904 (1980).
  • [10] V. V. Nemov, S. V. Kasilov, W. Kernbichler and M. F. Heyn, Phys. Plasmas 6, 4622 (1999).
  • [11] R. Sanchez, S. P. Hirshman and A. S. Ware, J. Comput. Phys. 161, 576 (2000).

This paper may be cited as follows:

Donald A. SPONG and Jeffrey H. HARRIS, Plasma Fusion Res. 5, S2039 (2010).