Electron velocity diffusion in strong turbulence

Author

Hirose, A. ; Edler, K. ; Bolster, E. ; Ishihara, O.

Author_Institution

Plasma Phys. Lab., Univ. of Saskatchewan, Saskatoon, Sask., Canada

Volume

31

Issue

1

fYear

2003

fDate

2/1/2003 12:00:00 AM

Firstpage

3

Lastpage

6

Abstract

Velocity diffusion of electrons placed in strong Langmuir turbulence has been numerically investigated. The velocity variance initially exhibits quasi-linear behavior followed by non-Markovian subdiffusive phase in agreement with the previous theoretical predictions. However, the subdiffusive phase is also transient and a well defined diffusive phase with a constant diffusivity emerges. The asymptotic diffusivity scales as √σ where σ is the RMS amplitude of the turbulent electric potential.

Keywords

diffusion; plasma transport processes; plasma turbulence; turbulence; Langmuir turbulence; asymptotic diffusivity; asymptotic stage; binary collisions; charged particles; diffusive phase; electromagnetic turbulence; electron velocity diffusion; extended resonance broadening theory; kurtosis-like quantity; lowest order theory; nonMarkovian subdiffusive phase; numerical simulations; particle orbits; quasi-linear behavior; quasi-linear diffusion; quasi-linear theory; randomization; strong Langmuir turbulence; subdiffusive to diffusive phase transition mechanism; transient subdiffusive phase; velocity space; velocity variance; Chaos; Electric potential; Electromagnetic transients; Electrons; Equations; Numerical simulation; Physics; Resonance; Space heating; Testing;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2003.809279

Filename

1190962