Interplay between nonlinear transport crossphase and zonal models in two-field ITG turbulence

Paper i proceeding, 2025

It is well-known that 𝐸 × 𝐵 flows can suppress
turbulent transport in fusion devices, either via
suppression of the turbulence amplitude [1], or via
suppression of the transport crossphase between the
electric potential and the transported quantity, e..g.
ion/electron temperature or density, etc ... [2].
Several works showed evidence of radial modulation of
the transport crossphase in the Hasegawa-Wakatani
model [3,4,5]. In the present work, we derive the
nonlinear crossphase dynamics directly from the Tensor
wave-kinetic equation (TWKE) [6] - a natural extension
of the standard WKE for drift-waves [7]. We apply this
analysis to the well-known Chalmers two-field ion-
temperature-gradient driven (ITG) turbulence model
[8,9].