It is assumed that profile information exists on a grid from
0 to jmaxm when the model is called. Gradients are computed
with respect to the normalized square root of the toroidal flux
with where is the toroidal flux,
BT is the toroidal field, and a is the minor radius.
For every unstable root in the ky spectrum, the quasi-linear
diffusivities are derived summing over the individual contributions.
The effective transport coefficients are in units
of m2/s and are defined assuming that the the transport equations
take the form prescribed by the ITER Expert Group,
Here, is the effective diffusivity and no distinction is made between convection and conduction.
The toroidal momentum is defined with the
momentum diffusion equation given as