Driving rotamak currents with minimal power dissipation

J. J. Van De Wetering, N. J. Fisch

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The Rotamak is a proposed thermonuclear fusion device which employs rotating magnetic fields (RMF) to generate an azimuthal current to produce a field-reversed configuration. The efficiency of the currents that produce the field reversal by RMFs was debated some 40 years ago. The debate revolved around whether the currents would incur dissipation by the conventional Spitzer perpendicular resistivity, or whether some other relation between current and dissipation would be more appropriate. By employing an electron-ion pitch-angle scattering model, we find that the dissipation is non-Spitzer in nature. However, curiously, there appears to exist a regime where the power dissipated to maintain the current becomes vanishingly small.

Original languageEnglish (US)
Article number122504
JournalPhysics of Plasmas
Issue number12
StatePublished - Dec 1 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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