Title :
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
fDate :
2/1/2003 12:00:00 AM
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;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2003.809279
