Random forcing with a constant power input for two-dimensional gyrokinetic simulations

TL;DR

This paper introduces a novel random forcing method with constant power input for 2D gyrokinetic turbulence simulations, enabling controlled energy injection and detailed analysis of energy dissipation in plasma turbulence.

Contribution

The paper presents a new forcing technique that maintains constant power input, allowing for precise simulation of stationary plasma turbulence across different regimes.

Findings

Successfully reproduces theoretical scaling laws in large-scale fluid and small-scale kinetic regimes.

Enables controlled energy injection for steady-state turbulence studies.

Provides insights into energy dissipation channels in plasma turbulence.

Abstract

A method of random forcing with a constant power input for two-dimensional gyrokinetic turbulence simulations is developed for the study of stationary plasma turbulence. The property that the forcing term injects the energy at a constant rate enables to set up turbulence in the desired range and to quantitatively assess energy dissipation channels in a statistically steady state. Using the developed method, turbulences in the large scale fluid and small scale kinetic regimes are demonstrated, where the theoretically predicted scaling laws are successfully reproduced.