Concerns about the flexibility and robustness of a compact quasiaxial stellarator design are addressed by studying the effects of varied pressure and rotational transform profiles on expected performance. For thirty, related, fully three-dimensional configurations the global, ideal magnetohydrodynamic (MHD) stability and energetic particle transport are evaluated. It is found that tokamak intuition is relevant to understanding the magnetohydrodynamic stability, with pressure gradient driving terms and shear stabilization controlling both the periodicity preserving, and the nonperiodicity preserving, unstable kink modes. Global kink modes are generated by steeply peaked pressure profiles near the half radius and edge localized kink modes are found for plasmas with steep pressure profiles at the edge as well as with edge rotational transform above 0.5. Energetic particle transport is not strongly dependent on these changes of pressure and current (or rotational transform) profiles, although a weak inverse dependence on pressure peaking through the corresponding Shafranov shift is found. While good transport and MHD stability are not anticorrelated in these equilibria, stability only results from a delicate balance of the pressure and shear stabilization forces. A range of interesting MHD behaviors is found for this large set of equilibria, exhibiting similar particle transport properties.
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June 2000
Research Article|
June 01 2000
Robustness and flexibility in compact quasiaxial stellarators: Global ideal magnetohydrodynamic stability and energetic particle transport Available to Purchase
M. H. Redi;
M. H. Redi
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543
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A. Diallo;
A. Diallo
University of Montana, Missoula, Montana 59801
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W. A. Cooper;
W. A. Cooper
Centre de Recherche des Physique des Plasmas, Lausanne, Switzerland
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G. Y. Fu;
G. Y. Fu
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543
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C. Nührenberg;
C. Nührenberg
Max Planck Institut für Plasma Physik, Greifswald, Germany
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N. Pomphrey;
N. Pomphrey
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
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A. H. Reiman;
A. H. Reiman
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
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M. C. Zarnstorff;
M. C. Zarnstorff
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
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M. H. Redi
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543
A. Diallo
University of Montana, Missoula, Montana 59801
W. A. Cooper
Centre de Recherche des Physique des Plasmas, Lausanne, Switzerland
G. Y. Fu
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543
C. Nührenberg
Max Planck Institut für Plasma Physik, Greifswald, Germany
N. Pomphrey
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
A. H. Reiman
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
M. C. Zarnstorff
Princeton Plasma Physies Laboratory, Princeton University, Princeton, New Jersey 08543
NCSX Team
Phys. Plasmas 7, 2508–2516 (2000)
Article history
Received:
January 19 2000
Accepted:
March 03 2000
Citation
M. H. Redi, A. Diallo, W. A. Cooper, G. Y. Fu, C. Nührenberg, N. Pomphrey, A. H. Reiman, M. C. Zarnstorff, NCSX Team; Robustness and flexibility in compact quasiaxial stellarators: Global ideal magnetohydrodynamic stability and energetic particle transport. Phys. Plasmas 1 June 2000; 7 (6): 2508–2516. https://doi.org/10.1063/1.874090
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