Impact of Stationary Direct Current in the Central Solenoidal Coil on Tokamak Plasma Formation by Non-induction Heating

Expansion of the Operation Region of Tokamak Plasmas Using the Stationary Direct Current of a Central Solenoid

“…To sustain the equilibrium tokamak plasma, it is necessary that the heating energy required for the increase of plasma current exceeds the energy loss that accompanies the reduction of the plasma current. The amount of mag- netic field energy in the CS region depends on the plasma current, that can be changed by the DC CS [8,9]. Consequently, the energy necessary for tokamak plasma formation is modified.…”

“…As a result, an equilibrium tokamak plasma with small plasma current and small major radius might become sustainable at a lower heating power. The 50% reduction in the minimum ECH power necessary for tokamak plasma formation is likely due to a combination of these effects [3,[9][10][11].…”

“…The possibility that a stationary direct current applied to a central solenoid (DC CS ) can improve the tokamak plasma stability was described theoretically [8,9]. The tokamak plasma configuration determined by the vertical magnetic field structure at the plasma region is almost the same with or without the DC CS .…”