A tokamak divertor must withstand power deposition in excess of 10 MW/m^2 in steady state and much higher in disruptions, enough to destroy nearly any material. In order to handle this extreme heat, there is some interest in using liquid metal flows to continually renew the divertor surface. In this paper, we examine an idea for a divertor with a porous surface that allows liquid lithium flowing through the divertor to percolate to the plasma facing surface. This idea is complicated by magnetohydrodynamic drag, where the stong magnetic fields in the tokamak cause the lithium to flow too slowly to carry away all the heat. In order to speed the lithium up, we apply an electric current across the channel.
We simulate the system using a simplified model in ANSYS, which we validate through comparisons to several analytical results. The simulation suggests that the design can handle the power applied a divertor. We examine the amount of current that must be applied to achieve sufficient lithium velocities, and begin to probe the effect of channel geometries on divertor efficiency.
"Virtual Prototyping of Liquid Lithium Divertor Concepts,"
Macalester Journal of Physics and Astronomy: Vol. 9
, Article 2.
Available at: https://digitalcommons.macalester.edu/mjpa/vol9/iss1/2