Physics – Plasma Physics
Scientific paper
2009-02-04
Phys. Rev. ST Accel. Beams 12, 060704 (2009)
Physics
Plasma Physics
8 pages, 10 figures. Updated version as accepted by the journal.
Scientific paper
10.1103/PhysRevSTAB.12.060704
The out-of-equilibrium mean-field dynamics of a model for wave-particle interaction is investigated. Such a model can be regarded as a general formulation for all those applications where the complex interplay between particles and fields is known to be central, e.g., electrostatic instabilities in plasma physics, particle acceleration and free-electron lasers (FELs). The latter case is here assumed as a paradigmatic example. A transition separating different macroscopic regimes is numerically identified and interpreted by making use of the so-called violent relaxation theory. In the context of free-electron lasers, such a theory is showed to be effective in predicting the saturated regime for energies below the transition. The transition is explained as a dynamical switch between two metastable regimes, and is related to the properties of a stationary point of an entropic functional.
Bachelard Romain
Buyl Pierre de
Fanelli Duccio
Ninno Giovanni de
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