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Energizing charged particles by an orbit instability in a slowly rotating magnetic field

Eric Palmerduca*, Hong Qin, and Samuel A. Cohen

  • Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08540, USA and Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA

  • *ep11@princeton.edu
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Phys. Rev. E 106, 045209 – Published 21 October, 2022

DOI: https://doi.org/10.1103/PhysRevE.106.045209

Abstract

The stability of charged particle motion in a uniform magnetic field with an added spatially uniform transverse rotating magnetic field (RMF) is studied analytically. It is found that the stability diagram of a single particle's orbit depends critically on the chosen boundary conditions. We show that for many boundary conditions and wide regions in the parameter space, RMFs oscillating far below the cyclotron frequency can cause linear instabilities in the motion which break μ invariance and energize particles. Such energization may appear at odds with the adiabatic invariance of μ; however, adiabatic invariance is an asymptotic result and does not preclude such heating by magnetic fields oscillating at slow frequencies. This mechanism may contribute to heating in the edge plasma of field-reversed configurations (FRCs) in rotamak-FRC experiments. Furthermore, these RMF-driven instabilities may significantly enhance azimuthal current drive during the formation of FRCs in such devices.

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Phys. Rev. E 106, 045209– Published 21 October, 2022
  • Received 27 July 2022
  • Accepted 29 September 2022
Article part of CHORUS
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