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Related Experiment Videos

Spheromak formation by steady inductive helicity injection.

T R Jarboe1, W T Hamp, G J Marklin

  • 1University of Washington, Seattle, Washington 98195-2250, USA.

Physical Review Letters
|October 10, 2006
PubMed
Summary

Researchers achieved steady state spheromak plasma formation using a novel inductive helicity injection method. This new technique significantly lowers the power threshold for spheromak production, offering a more efficient approach to plasma confinement.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research

Background:

  • Spheromak configurations are crucial for magnetic confinement fusion.
  • Previous methods for spheromak formation, like electrode-based helicity injection, were power-intensive.
  • Achieving a stable, steady-state spheromak is a key challenge in fusion research.

Purpose of the Study:

  • To demonstrate a new steady-state inductive helicity injection method for spheromak formation.
  • To investigate the efficiency and characteristics of spheromak plasma generated by this novel method.
  • To compare the power requirements with existing helicity injection techniques.

Main Methods:

  • Utilized two inductive injectors with odd symmetry, oscillating at 5.8 kHz.
  • Employed nonlinear relaxation processes to form and sustain the spheromak.

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  • Employed internal magnetic probes to analyze plasma properties and compare with theoretical models.

    • Main Results:

    • Successfully formed and sustained a steady-state spheromak with even symmetry.
    • Achieved a toroidal current of approximately 13 kA using about 3 MW of power.
    • Observed agreement between internal magnetic probe data and the Taylor state model, with minimal fitting parameters.

    Conclusions:

    • The new steady-state inductive helicity injection method is effective for spheromak production.
    • This method offers a significantly lower power threshold compared to electrode-based methods.
    • The results validate the Taylor state model for spheromaks generated under these conditions.