Robustness and flexibility in compact quasiaxial stellarators: Global ideal MHD stability and energetic particle transport

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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 stability is evaluated as well as energetic particle transport. 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, N=0, and the non-periodicity preserving, N=1, unstable kink modes. Global kink modes are generated by steeply peaked pressure profiles near the half radius and edge localized kink ... continued below

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363 Kilobytes pages

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Redi, M.H.; Diallo, A.; Cooper, W.A. & Fu, G.Y. January 27, 2000.

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Description

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 stability is evaluated as well as energetic particle transport. 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, N=0, and the non-periodicity preserving, N=1, 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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363 Kilobytes pages

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INIS; OSTI as DE00750431

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  • Other Information: PBD: 27 Jan 2000

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  • Report No.: PPPL--3429
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/750431 | External Link
  • Office of Scientific & Technical Information Report Number: 750431
  • Archival Resource Key: ark:/67531/metadc703216

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  • January 27, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 15, 2016, 7:37 p.m.

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Redi, M.H.; Diallo, A.; Cooper, W.A. & Fu, G.Y. Robustness and flexibility in compact quasiaxial stellarators: Global ideal MHD stability and energetic particle transport, report, January 27, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc703216/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.