For a moment consider a single beam in a storage ring. Individual particle motions are linear at small amplitudes with tunes, optical functions, and, in the case of electrons, synchrotron radiation properties determined by the dipoles, quadrupoles, and RF system. At larger amplitudes, intentional and unintentional field ndinearities lead to amplitude dependent tunes, nonlinear resonances, and a...

Abstract. In this paper, an enhanced beam model based on a 5-parameter displacement field, recently proposed by the authors and able to reproduce Poisson effect in transverse direction is presented, utilized simulate fully geometrically nonlinear response of elastic structures. The adoption linear solution as approximation functions for case allows prediction problems involving complex geometri...

We outline a new nonlinear multifrequency Traveling Wave Tube (TWT) model based on Eulerian electron beam equations. We identify and illustrate with preliminary examples types of problems the model may be applied to. In particular, the model is well suited to accommodate many closelyspaced frequencies in simulation and analysis.

coupled -shear walls are one of lateral load resisting systems in high and medium rise reinforced concrete buildings. the lateral structural response is exactly dependents on the shear walls behavior; therefore these elements must response well whenundergodifferent load conditions. the structures located in near-source region behave differently compared to those in near-source sites when subjec...

We report the first experimental demonstration of two-dimensional spatial solitary waves in secondorder nonlinear optical material. When an intense optical beam is focused into a phase-matchable second-order nonlinear material, the fundamental and generated second-harmonic fields are mutually trapped as a result of the strong nonlinear coupling which counteracts both diffraction and beam walkoff.