The presence of non-axisymmetric perturbations in an axisymmetric magneticfield equilibrium renders the Guiding Center (GC) particle motionnon-integrable and may result in particle, energy and momentum redistribution,due to resonance mechanisms. We analyse these perturbations in terms of theirspectrum, as observed by the particles in the frame of unperturbed GC motion.We calculate semi-analytically the exact locations and strength of resonantspectral components of multiple perturbations. The presented Orbital SpectrumAnalysis (OSA) method is based on an exact Action-Angle transform that fullytakes into account Finite Orbit Width (FOW) effects. The method providesinsight into the particle dynamics and enables the prediction of the effect ofany perturbation to all different types of particles and orbits in a given,analytically or numerically calculated, axisymmetric equilibrium.
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