T3FF: Toroidal 3-dimensional full-f full-k code for isothermal gyrofluid drift-Alfvén turbulence

T3FF is a gyrofluid code for computation of isothermal three-dimensional electromagnetic edge turbulence in magnetized plasmas with consistent finite Larmor radius (FLR) treatment. The model allows for arbitrary fluctuation amplitudes (“full-f”) and includes second-order accurate FLR effects in the polarization (“full-k”). The presented code version employs a field-aligned flux-tube geometry for simplified circular toroidal geometry on the closed flux surface edge region of a tokamak plasma. The T3FF code is intended for basic physics studies with the most elementary implementation of a full-f three-dimensional electromagnetic drift wave turbulence model with consistent FLR effects, and as basis for later extension up to a thermal six-moment gyrofluid model.