Two-fluid theory of divertors without viscosity

A simple model of a divertor is studied with the classical two-fluid equations. The ion temperature is assumed zero, which has the simplifying effect of giving zero ion viscosity. The electrons are shown to leave the divertor much closer to the main body of the plasma than the ions. The divertor width is found comparable to the ion gyroradius calculated with the electron temperature, which is substantially wider than some classical estimates