Giotto:. a Code for the Nonlinear Analysis of Area-Preserving Mappings

An interactive code for the analysis of nonlinear area-preserving mappings is described; several facilities allow the user to draw phase portraits, make zooming, and use colors. The perturbative approach of normal forms and all the standard tools for the analysis of the nonlinear dynamics (Fourier spectra, Lyapunov exponents, fixed points …) are implemented in a user-friendly graphic environment based on X-window and OSF-Motif. Both simple models and more involved mappings which describe the betatronic motion in a particle accelerator can be implemented.