Physics – Mathematical Physics
Scientific paper
2011-10-21
J. Phys. A: Math. Theor. 45 105203 (2012)
Physics
Mathematical Physics
25 pages, 1 figure
Scientific paper
10.1088/1751-8113/45/10/105203
On the basis of the Lorentz equations of motion, the orbit of a charge driven by a generic E.M. field with planar symmetry is formulated and analyzed within the framework of a Lorentzian geometry with a curvature whose order of magnitude is parametrized by the radiation intensity and frequency. This reformulation leads to (i) a demonstration of the integrability of the particle motion in a plane-wave field as a result of the vanishing of the curvature, (ii) a manifestation of the parametric dependence of the dynamical response of the particle orbit to the E.M. field on the impulse factor in terms of local stability and the occurrence of parametric resonance and (iii) a mathematically precise meaning to the ponderomotive oscillation center of the charge executing oscillatory motion in a sufficiently low impulsive E.M. field, which is subsequently used to raise (iv) a discussion of the domain of applicability of the ponderomotive approximation.
Kwa Kiam Heong
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