Ultra low aspect ratio stellarator or hybrid configurations

P. E. Moroz, D. B. Batchelor, B. A. Carreras, S. P. Hirshman, D. K. Lee, V. E. Lynch, D. A. Spong, J. S. Tolliver, A. S. Ware, J. C. Whitson

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations


Novel concepts of an ultra-low-aspect-ratio stellarator system, called a Spherical Stellarator (SS), or a stellarator-tokamak hybrid system, called SMARTH (Small Aspect Ratio Toroidal Hybrid) are discussed for high-β regimes of operation. Self-consistent analysis of the three-dimensional MHD equilibria with inductively driven plasma current or bootstrap current is presented. It is stressed that the bootstrap current in SS can be large and is flowing in such a direction that the rotational transform produced enhances the vacuum rotational transform. This feature increases the equilibrium β-limit. The high-β equilibria in SS and SMARTH (β(0) > 30%, β̄ ≈ 8-9%) are demonstrated, correspondingly, with the bootstrap current and the ohmic current. Possible experiments and scalings, including those for reactor parameters, are outlined.

Original languageEnglish
Pages (from-to)1347-1354
Number of pages8
JournalFusion Science and Technology
Issue number3
StatePublished - 1996
EventProceedings of the 1996 12th Topical Meeting on the Technology of Fusion Energy. Part 2 (of 2) - Reno, NV, USA
Duration: Jun 16 1996Jun 20 1996


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