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Orbits of magnetized charged particles in parabolic and inverse electrostatic potentials

Part of: Diagnostics of Dust in Plasmas

Published online by Cambridge University Press:  28 January 2016

P. M. Bellan
P. M. Bellan*
Affiliation:
Applied Physics and Materials Science Department, California Institute of Technology, Pasadena, CA 91125, USA
*
†Email address for correspondence: pbellan@caltech.edu
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Abstract

Analytic solutions are presented for the orbit of a charged particle in the combination of a uniform axial magnetic field and parabolic electrostatic potential. These trajectories are shown to correspond to the sum of two individually rotating vectors with one vector rotating at a constant fast frequency and the other rotating in the same sense but with a constant slow frequency. These solutions are related to Penning trap orbits and to stochastic orbits. If the lengths of the two rotating vectors are identical, the particle has zero canonical angular momentum in which case the particle orbit will traverse the origin. If the potential has an inverse dependence on distance from the source of the potential, the particle can impact the source. Axis-encircling orbits are where the length of the vector associated with the fast frequency is longer than the vector associated with the slow frequency. Non-axis-encircling orbits are the other way around.

Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 1 , February 2016 , 615820101
Copyright
© Cambridge University Press 2016 

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