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Phys. Rev. E 77, 036402 (2008) [10 pages]

Positive and negative effective mass of classical particles in oscillatory and static fields

I. Y. Dodin and N. J. Fisch
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
Received 27 November 2007; published 7 March 2008

A classical particle oscillating in an arbitrary high-frequency or static field effectively exhibits a modified rest mass meff derived from the particle averaged Lagrangian. Relativistic ponderomotive and diamagnetic forces, as well as magnetic drifts, are obtained from the meff dependence on the guiding center location and velocity. The effective mass is not necessarily positive and can result in backward acceleration when an additional perturbation force is applied. As an example, adiabatic dynamics with m||>0 and m||<0 is demonstrated for a wave-driven particle along a dc magnetic field, m|| being the effective longitudinal mass derived from meff. Multiple energy states are realized in this case, yielding up to three branches of m|| for a given magnetic moment and parallel velocity.

©2008 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevE.77.036402
DOI: 10.1103/PhysRevE.77.036402
PACS: 52.35.Mw; 45.50.-j; 45.20.Jj; 52.27.Ny
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions
  • 45.50.-j
    Dynamics and kinematics of a particle and a system of particles
  • 45.20.Jj
    Lagrangian and Hamiltonian mechanics
  • 52.27.Ny
    Relativistic plasmas
  • YEAR: 2008
KEYWORDS: magnetic forces, magnetostatics

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