High-field, high-current-density, stable superconducting magnets for fusion machines

Lue, J W; Dresner, L; Lubell, M S

Title: High-field, high-current-density, stable superconducting magnets for fusion machines

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Abstract

Designs for large fusion machines require high-performance superconducting magnets to reduce cost or increase machine performance. By employing force-flow cooling, cable-in-conduit conductor configuration, and NbTi superconductor, it is now possible to design superconducting magnets that operate a high fields (8-12 T) with high current densities (5-15 kA/cm/sup 2/ over the winding pack) in a stable manner. High current density leads to smaller, lighter, and thus less expensive coils. The force-flow cooling provides confined helium, full conductor insulation, and a rigid winding pack for better load distribution. The cable-in-conduit conductor configuration ensures a high stability margin for the magnet. The NbTi superconductor has reached a good engineering material standard. Its strain-insensitive critical parameters are particularly suitable for complex coil windings of a stellarator machine. The optimization procedure for such a conductor design, developed over the past decade, is summarized here. If desired a magnet built on the principles outlines in this paper can be extended to a field higher than the design value without degrading its stability by simply lowering the operating temperature below 4.2 K. 11 refs., 3 figs.

Authors:: Lue, J W; Dresner, L; Lubell, M S

Publication Date:: Sun Jan 01 00:00:00 EST 1989

Research Org.:: Oak Ridge National Lab., TN (USA)

OSTI Identifier:: 6026380

Report Number(s):: CONF-890403-21
ON: DE89012352

DOE Contract Number:: AC05-84OR21400

Resource Type:: Conference

Resource Relation:: Conference: 7. international stellarator workshop, Oak Ridge, TN, USA, 10 Apr 1989; Other Information: Portions of this document are illegible in microfiche products

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SUPERCONDUCTING MAGNETS; DESIGN; CRYOGENICS; CURRENT DENSITY; NIOBIUM BASE ALLOYS; STELLARATORS; SUPERCONDUCTING CABLES; THERMONUCLEAR REACTORS; TITANIUM ALLOYS; ALLOYS; CABLES; CLOSED PLASMA DEVICES; CONDUCTOR DEVICES; ELECTRIC CABLES; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; MAGNETS; NIOBIUM ALLOYS; SUPERCONDUCTING DEVICES; THERMONUCLEAR DEVICES; 700202* - Fusion Power Plant Technology- Magnet Coils & Fields

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                    Lue, J W, Dresner, L, and Lubell, M S. High-field, high-current-density, stable superconducting magnets for fusion machines.  United States: N. p., 1989. 
        Web.

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                    Lue, J W, Dresner, L, & Lubell, M S. High-field, high-current-density, stable superconducting magnets for fusion machines.  United States.

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                    Lue, J W, Dresner, L, and Lubell, M S. 1989.  
        "High-field, high-current-density, stable superconducting magnets for fusion machines".  United States.  https://www.osti.gov/servlets/purl/6026380.

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@article{osti_6026380,

  title        = {High-field, high-current-density, stable superconducting magnets for fusion machines},

  author       = {Lue, J W and Dresner, L and Lubell, M S},

  abstractNote = {Designs for large fusion machines require high-performance superconducting magnets to reduce cost or increase machine performance. By employing force-flow cooling, cable-in-conduit conductor configuration, and NbTi superconductor, it is now possible to design superconducting magnets that operate a high fields (8-12 T) with high current densities (5-15 kA/cm/sup 2/ over the winding pack) in a stable manner. High current density leads to smaller, lighter, and thus less expensive coils. The force-flow cooling provides confined helium, full conductor insulation, and a rigid winding pack for better load distribution. The cable-in-conduit conductor configuration ensures a high stability margin for the magnet. The NbTi superconductor has reached a good engineering material standard. Its strain-insensitive critical parameters are particularly suitable for complex coil windings of a stellarator machine. The optimization procedure for such a conductor design, developed over the past decade, is summarized here. If desired a magnet built on the principles outlines in this paper can be extended to a field higher than the design value without degrading its stability by simply lowering the operating temperature below 4.2 K. 11 refs., 3 figs.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6026380},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 00:00:00 EST 1989},

  month        = {Sun Jan 01 00:00:00 EST 1989}

}

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