Apparently the Chinese superconducting tokamak (like ITER but not spherical) demonstrated experimentally this theory, which should allow for denser plasma and therefore more efficient operation.

The recent development of the plasma–wall self organization (PWSO) theory provides a novel perspective on understanding the disruptive density limit. PWSO was originally proposed by D.F. Escande et al. from the French National Center for Scientific Research and Aix-Marseille University. The theory predicts that a new density-free regime could be accessed by achieving a delicate balance between the plasma and the metallic walls of the device, which are dominated by physical sputtering.