The parallel boundary condition for turbulence simulations in low magnetic shear devices
The parallel boundary condition for turbulence simulations in low magnetic shear devices
Flux tube simulations of plasma turbulence in stellarators and tokamaks typically employ coordinates which are aligned with the magnetic field lines. Anisotropic turbulent fluctuations can be represented in such field-aligned coordinates very efficiently, but the resulting non-trivial boundary conditions involve all three spatial directions, and must be handled with care. …