J* optimization of small aspect ratio stellarator/tokamak hybrid devices

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A new class of low aspect ratio toroidal hybrid stellarators is found using more general plasma confinement optimization criterion than quasi-symmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant J* on internal flux surfaces (quasi-omnigeneity), in addition to a number of other desirable physics target properties. We find that a range of compact (small aspect ratio A), high {beta} (ratio of thermal energy to magnetic field energy), low plasma current devices exist which have significantly improved confinement both for thermal as well as ... continued below

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12 p.

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Spong, D.A.; Hirshman, S.P. & Whitson, J.C. December 31, 1997.

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Description

A new class of low aspect ratio toroidal hybrid stellarators is found using more general plasma confinement optimization criterion than quasi-symmetrization. The plasma current profile and shape of the outer magnetic flux surface are used as control variables to achieve near constancy of the longitudinal invariant J* on internal flux surfaces (quasi-omnigeneity), in addition to a number of other desirable physics target properties. We find that a range of compact (small aspect ratio A), high {beta} (ratio of thermal energy to magnetic field energy), low plasma current devices exist which have significantly improved confinement both for thermal as well as energetic (collisionless) particle components. With reasonable increases in magnetic field and geometric size, such devices can also be scaled to confine 3.5 MeV alpha particle orbits.

Physical Description

12 p.

Notes

INIS; OSTI as DE98001938

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  • 39. annual meeting of the Division of Plasma Physics of the American Physical Society, Pittsburgh, PA (United States), 17-21 Nov 1997

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  • Other: DE98001938
  • Report No.: ORNL/CP--95522
  • Report No.: CONF-971103--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 565372
  • Archival Resource Key: ark:/67531/metadc693292

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  • December 31, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 12:48 p.m.

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Spong, D.A.; Hirshman, S.P. & Whitson, J.C. J* optimization of small aspect ratio stellarator/tokamak hybrid devices, article, December 31, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc693292/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.