2d Mhd Study Of The Plasma Formation Using The Induction Of In-Vessel Poloidal Field Coils Inside The Spherical Tokamak

The formation and merging of the ST plasmas in the spherical tokamak have been studied by the means of the 2D toroidal MHD simulation for the two cases with a single and double PF coils. The following results were obtained: (i) during the ST plasmas formation, an internal toroidal flux is injected to the ST plasmas, (ii) this internal flux increases strongly during the plasma merging, and (iii) the internal toroidal flux damps after the merging. (C) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research