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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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Stellarators with Permanent Magnets.

P Helander1,2, M Drevlak1,2, M Zarnstorff2,3

  • 1Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany.

Physical Review Letters
|March 24, 2020
PubMed
Summary
This summary is machine-generated.

Permanent magnets can simplify stellarator magnetic-field coils by shaping plasma to create necessary magnetic fields. This approach enables simpler, potentially more cost-effective stellarator designs with fewer coils.

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Area of Science:

  • Plasma Physics
  • Fusion Energy
  • Magnetohydrodynamics

Background:

  • Stellarators require complex magnetic coils to confine plasma.
  • Existing stellarator designs often involve intricate and numerous magnetic coils.
  • Simplifying coil configurations is crucial for advancing stellarator technology.

Purpose of the Study:

  • To investigate the potential of permanent magnets in simplifying stellarator magnetic-field coil designs.
  • To explore how permanent magnets can contribute to plasma shaping and magnetic field generation.
  • To demonstrate a simplified stellarator configuration using permanent magnets.

Main Methods:

  • Theoretical analysis of magnetic field generation using permanent magnets.
  • Computational modeling of plasma shaping with permanent magnets.
  • Design and construction of a quasiaxisymmetric stellarator configuration with simplified coils.

Main Results:

  • Permanent magnets can substitute some functions of traditional magnetic coils for plasma shaping.
  • A simplified stellarator configuration with only 8 identical circular coils and permanent magnets was designed.
  • Permanent magnets contribute to creating poloidal flux and rotational transform.

Conclusions:

  • Permanent magnets offer a viable method for substantially simplifying stellarator magnetic-field coils.
  • This simplification can reduce the complexity and potentially the cost of stellarator devices.
  • The proposed approach paves the way for more accessible and practical stellarator fusion reactors.