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Updated: Jun 12, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
Transition to superdiffusive transport in turbulent plasmas
Matteo Stanzani1, Filippo Arlotti1, Guido Ciraolo2
1CEA, <a href="https://ror.org/03hffat62">IRFM</a>, F-13108 Saint-Paul-Lez-Durance, France and <a href="https://ror.org/01111rn36">University of Bologna</a>, DIN, 40136 Bologna, Italy.
Abstract:
We investigate the motion of charged particles in a turbulent electrostatic potential using guiding-center theory. By increasing the Larmor radius, the dynamics exhibit close-to-ballistic transport properties. The transition from diffusive to ballistic transport is analyzed using nonlinear dynamics. It is found that twistless invariant tori in the guiding-center dynamics are responsible for this transition, drastically affecting transport properties of charged particles.
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