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(FTP2/18) Compact Stellarators as Reactors

J. F. Lyon¹⁾, P. Valanju²⁾, M. C. Zarnstorff³⁾, S. Hirshman¹⁾, D. A. Spong¹⁾, D. Strickler¹⁾, A. Ware⁴⁾, D. E. Williamson^1)
 
1) Oak Ridge National Laboratory, Oak Ridge, TN, U.S.A.
²⁾ University of Texas at Austin, Austin, TX, U.S.A.
³⁾ Princeton Plasma Physics Laboratory, Princeton, NJ, U.S.A.
⁴⁾ University of Montana, Missoula, MT, U.S.A.

Abstract.  Two types of compact stellarators are examined as reactors: two- and three-field-period (M = 2 and 3) quasi-axisymmetric devices with volume-average $\langle$$\beta$$\rangle$ = 4 - 5% and M = 2 and 3 quasi-poloidal devices with $\langle$$\beta$$\rangle$ = 10 - 15%. These low-aspect-ratio stellarator-tokamak hybrids differ from conventional stellarators in their use of the plasma-generated bootstrap current to supplement the poloidal field from external coils. Using the ARIES-AT model with B_max = 12T on the coils gives Compact Stellarator reactors with R = 7.3 - 8.2m, a factor of 2-3 smaller R than other stellarator reactors for the same assumptions, and neutron wall loadings up to 3.7MWm^{- 2}.

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