Revisited neoclassical transport theory for steep, collisional plasma edge profiles
Published neoclassical results are misleading where they concern the plasma edge for they do not adequately take into account the peculiar local conditions, in particular the fact that the density and temperature variation length-scales are quite small. In the high collisionality regime gyro-stress tensor and ion inertia play an essential role if the ratio q(2)R(2)/[omega(i)tau(i)]aL(N,T) is of the order of, or larger than, unity. Coupled novel neoclassical equations then apply, not only for the evolution of the density and temperatures, but also for the radial electric field and the evolution of the parallel ion momentum. Gyro-stresses and inertia upset the ambipolarity of particle transport and a radial electric field builds up. The increased nonlinear character of these revisited neoclassical equations widens the realm of possible plasma behaviour.
Bibliographic Reference: Article: Plasma Phys. Control. Fusion, Vol. 36 (1994) pp. A213-A217
Record Number: 199411248 / Last updated on: 1994-11-25
Original language: en
Available languages: en