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 ?. We investigate the mean square displacements of particles in both position and velocity spaces. As ? 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.

Position and velocity space diffusion of test particles in stochastic electromagnetic fields

V Carbone;
2007

Abstract

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 ?. We investigate the mean square displacements of particles in both position and velocity spaces. As ? 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.
2007
Istituto per i Processi Chimico-Fisici - IPCF
File in questo prodotto:
File Dimensione Formato  
prod_185219-doc_33042.pdf

non disponibili

Descrizione: Articolo pubblicato
Dimensione 740.55 kB
Formato Adobe PDF
740.55 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/242915
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact