Beamlets from stochastic acceleration

Details Beamlets from stochastic acceleration Beamlets from stochastic acceleration

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrve..78c6201p&link_type=abstract

Physical Review E, vol. 78, Issue 3, id. 036201

Physics

1

Nonlinear Dynamics And Chaos, Random Walks And Levy Flights, Physics Of The Magnetosphere, Particle Acceleration

Scientific paper

We investigate the dynamics of a realization of the stochastic Fermi acceleration mechanism. The model consists of test particles moving between two oscillating magnetic clouds and differs from the usual Fermi-Ulam model in two ways. (i) Particles can penetrate inside clouds before being reflected. (ii) Particles can radiate a fraction of their energy during the process. Since the Fermi mechanism is at work, particles are stochastically accelerated, even in the presence of the radiated energy. Furthermore, due to a kind of resonance between particles and oscillating clouds, the probability density function of particles is strongly modified, thus generating beams of accelerated particles rather than a translation of the whole distribution function to higher energy. This simple mechanism could account for the presence of beamlets in some space plasma physics situations.

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