High-mode-number ballooning modes in a heliotron/torsatron system: 1, Local magnetic shear

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Description

The characteristics of the local magnetic shear, a quantity associated with high-mode-number ballooning mode stability, are considered in heliotron/torsatron devices that have a large Shafranov shift. The local magnetic shear is shown to vanish even in the stellarator-like region in which the global magnetic shear is positive. The reason for this is that the degree of the local compression of the poloidal magnetic field on the outer side of the torus, which maintains the toroidal force balance, is reduced in the stellarator-like region of global magnetic shear because the global rotational transform in heliotron/torsatron systems is a radially increasing function. ... continued below

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36 p.

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Nakajima, N. May 1, 1996.

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Description

The characteristics of the local magnetic shear, a quantity associated with high-mode-number ballooning mode stability, are considered in heliotron/torsatron devices that have a large Shafranov shift. The local magnetic shear is shown to vanish even in the stellarator-like region in which the global magnetic shear is positive. The reason for this is that the degree of the local compression of the poloidal magnetic field on the outer side of the torus, which maintains the toroidal force balance, is reduced in the stellarator-like region of global magnetic shear because the global rotational transform in heliotron/torsatron systems is a radially increasing function. This vanishing of the local magnetic shear is a universal property in heliotron/torsatron systems with a large Shafranov shift since it results from toroidal force balance in the stellarator-like global shear regime that is inherent to such systems.

Physical Description

36 p.

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INIS; OSTI as DE96011417

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  • Other Information: PBD: May 1996

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  • Other: DE96011417
  • Report No.: IFSR--749
  • Grant Number: FG03-96ER54346
  • DOI: 10.2172/261092 | External Link
  • Office of Scientific & Technical Information Report Number: 261092
  • Archival Resource Key: ark:/67531/metadc667817

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  • May 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Aug. 10, 2016, 2:13 p.m.

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Nakajima, N. High-mode-number ballooning modes in a heliotron/torsatron system: 1, Local magnetic shear, report, May 1, 1996; Austin, Texas. (digital.library.unt.edu/ark:/67531/metadc667817/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.