Volume 78, Number 4, May 2007
|Number of page(s)||5|
|Published online||03 May 2007|
Position and velocity space diffusion of test particles in stochastic electromagnetic fields
Dipartimento di Fisica, Università della Calabria - Via P. Bucci 31/C, I-87036 Rende (CS), Italy
2 Consorzio Interuniversitario per le Scienze Fisiche della Materia (CNISM), Unità di Cosenza - Via P. Bucci 31/C, I-87036 Rende (CS), Italy
3 Dipartimento di Fisica and INFN, Università di Roma “La Sapienza” - Piazzale A. Moro 2, I-00185 Roma, Italy
Accepted: 10 April 2007
The two-dimensional diffusive dynamics of test particles in a random electromagnetic field is studied. The synthetic electromagnetic fluctuations are generated through randomly placed magnetised “clouds” oscillating with a frequency ω. We investigate the mean square displacements of particles in both position and velocity spaces. As ω increases the particles undergo standard (Brownian-like) motion, anomalous diffusion and ballistic motion in position space. Although in general the diffusion properties in velocity space are not trivially related to those in position space, we find that energization is present only when particles display anomalous diffusion in position space. The anomalous character of the diffusion is only in the non-standard values of the scaling exponents while the process is Gaussian.
PACS: 05.40.Fb – Random walks and Levy flights / 05.45.-a – Nonlinear dynamics and chaos / 05.60.Cd – Classical transport
© Europhysics Letters Association, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.