An Oscillating Langevin Antenna for Driving Plasma Turbulence Simulations

TL;DR

This paper introduces an oscillating Langevin antenna method for driving plasma turbulence simulations, effectively modeling energy transfer and capturing key turbulence features in a computationally efficient manner.

Contribution

The paper presents a novel oscillating Langevin antenna technique that accurately simulates energy injection and turbulence dynamics in plasma simulations.

Findings

Efficiently generates steady-state turbulence within one turnaround time.

Captures essential features of large-scale plasma turbulence.

Flexible in exploring both strong and weak turbulence regimes.

Abstract

A unique method of driving Alfvenic turbulence via an oscillating Langevin antenna is presented. This method of driving is motivated by a desire to inject energy into a finite domain numerical simulation in a manner that models the nonlinear transfer of energy from fluctuations in the turbulent cascade at scales larger than the simulation domain.. The oscillating Langevin antenna is shown to capture the essential features of the larger scale turbulence and efficiently couple to the plasma, generating steady-state turbulence within one characteristic turnaround time. The antenna is also sufficiently flexible to explore both strong and weak regimes of Alfvenic plasma turbulence.