Periodic compression of an adiabatic gas: Intermittency-enhanced Fermi acceleration
1 School of Mathematics, University of Bristol - Bristol BS8 1TW, UK, EU
2 Departamento de Física, UNESP - Universidade Estadual Paulista - Av. 24A, 1515, Bela Vista, CEP: 13506-900, Rio Claro, SP, Brazil
Received: 3 May 2013
Accepted: 23 August 2013
A gas of non-interacting particles diffuses in a lattice of pulsating scatterers. In the finite-horizon case with bounded distance between collisions and strongly chaotic dynamics, the velocity growth (Fermi acceleration) is well described by a master equation, leading to an asymptotic universal non-Maxwellian velocity distribution scaling as . The infinite-horizon case has intermittent dynamics which enhances the acceleration, leading to and a non-universal distribution.
PACS: 05.20.Dd – Kinetic theory / 05.45.Ac – Low-dimensional chaos
© EPLA, 2013