# Gyrokinetic continuum simulation of turbulence in a straight open-field-line plasma

## TL;DR

This paper presents 3D continuum gyrokinetic simulations of plasma turbulence in a straight open-field-line geometry, incorporating key scrape-off layer physics, using the Gkeyll code, with applications to LAPD device modeling.

## Contribution

It introduces a full-f discontinuous-Galerkin gyrokinetic simulation approach for open-field-line plasma turbulence including sheath boundary conditions.

## Key findings

- Successful simulation of turbulence in LAPD with sheath boundary conditions
- Demonstration of cross-field turbulent transport modeling
- Inclusion of parallel flows and losses in the simulation

## Abstract

3D2V continuum gyrokinetic simulations of electrostatic plasma turbulence in a straight, open-field-line geometry have been performed using the full-$f$ discontinuous-Galerkin code Gkeyll. These simulations include the basic elements of a fusion-device scrape-off layer: localized sources to model plasma outflow from the core, cross-field turbulent transport, parallel flow along magnetic field lines, and parallel losses at the limiter or divertor with sheath model boundary conditions. The set of sheath boundary conditions used in the model allows currents to flow through the walls. In addition to details of the numerical approach, results from numerical simulations of turbulence in the Large Plasma Device (LAPD), a linear device featuring straight magnetic field lines, are presented.