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Piecewise omnigenous stellarators with zero bootstrap current.

Iván Calvo1, José Luis Velasco1, Per Helander2

  • 1CIEMAT, Laboratorio Nacional de Fusión, 28040 Madrid, Spain.

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|September 16, 2025
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Summary
This summary is machine-generated.

Piecewise omnigenous fields offer a new stellarator design approach, providing small radial neoclassical transport and zero bootstrap current. This broadens options for fusion reactor development.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Magnetic confinement fusion

Background:

  • Quasi-isodynamic stellarators were previously the only configurations with low neoclassical transport and zero bootstrap current.
  • Controlling magnetic configurations is crucial for stellarator reactor design.

Purpose of the Study:

  • To investigate the potential of piecewise omnigenous fields in stellarator configurations.
  • To demonstrate that piecewise omnigenous fields can achieve zero bootstrap current.

Main Methods:

  • Analytical proofs of concept.
  • Numerical simulations to confirm theoretical findings.

Main Results:

  • Existence of piecewise omnigenous fields with zero bootstrap current is proven.
  • Numerical results validate the analytical findings.
  • Piecewise omnigenity significantly expands the range of stellarator configurations.

Conclusions:

  • Piecewise omnigenous fields represent a viable alternative for stellarator reactor design.
  • This approach facilitates control of the magnetic configuration.
  • Offers a new pathway for achieving efficient fusion energy.