 As machines began to explore this newly shaped plasma, they noticed that certain arrangements of the fields and plasma parameters would sometimes enter what is now known as the high-confinement mode, or H-mode, which operated stably at higher temperatures and pressures.Operating in the H-mode, which can also be seen in stellarators, is now a major design goal of the tokamak design.Finally, it was noted that when the plasma had a non-uniform density would give rise to internal electrical currents.