  When a steady-state cylindrical plasma discharge is centrally fuelled, the
collisionless radial electron flux is canonically coupled to an axial current.
The identification and analysis of this transport driven current, previously
reported in collisionless simulations [W. J. Nunan and J. M. Dawson, Phys. Rev.
Lett. $\mathbf{73}$, 1628 (1994)], is addressed analytically and extended to
the collisional regime by means of first-principles kinetic models.
Collisionless radial transport is described with the standard quasilinear model
and collisional velocity anisotropy relaxation with the Landau kinetic
equation. When trapped particles corrections are taken into account, the
solution of this kinetic model provides the analytical expression for the
transport driven current in a centrally fuelled steady-state tokamak as a
function of the thermonuclear power and discharge parameters. For ITER type
discharges, with central fuelling, a current of about one mega-ampere is
predicted by this first-principles analytical kinetic model.
