201 citations · 572 across the 15 of their papers we have counts for
15 papers
Action diffusion and lifetimes of quasistationary states in the Hamiltonian Mean Field model
Wahb Ettoumi, Marie-Christine Firpo
Out-of-equilibrium quasistationary states (QSSs) are one of the signatures of a broken ergodicity in long-range interacting systems. For the widely studied Hamiltonian Mean-Field m…
Stochastic treatment of finite-N effects in mean-field systems and its application to the lifetimes of coherent structures
W. Ettoumi, M. -C. Firpo
A stochastic treatment yielding to the derivation of a general Fokker-Planck equation is presented to model the slow convergence towards equilibrium of mean-field systems due to fi…
Study of the interplay between magnetic shear and resonances using Hamiltonian models for the magnetic field lines
Marie-Christine Firpo, Dana Constantinescu
The issue of magnetic confinement in magnetic fusion devices is addressed within a purely magnetic approach. Using some Hamiltonian models for the magnetic field lines, the dual im…
Unveiling the nature of out-of-equilibrium phase transitions in a system with long-range interactions
M. -C. Firpo
Recently, there has been some vigorous interest in the out-of-equilibrium quasistationary states (QSSs), with lifetimes diverging with the number N of degrees of freedom, emerging…
Linear theory and violent relaxation in long-range systems: a test case
Wahb Ettoumi, Marie-Christine Firpo
In this article, several aspects of the dynamics of a toy model for longrange Hamiltonian systems are tackled focusing on linearly unstable unmagnetized (i.e. force-free) cold equi…
Enhanced confinement with increased extent of the low magnetic shear region in tokamak plasma
Lorenzo Nasi, Marie-Christine Firpo
The Hamiltonian representation of magnetic field lines enables one to study their confinement properties in tokamaks through the use of symplectic maps such as the symmetric tokama…