The primary superconducting coils have a fundamental role in plasma magnetic confinement in tokamaks. The magnetic field which produced by primary coil leads to more magnetic field force and better magnetic confinement. In addition, the primary coil acts as a transformer. In this research we have compared the changes of magnetic field and magnetic flux density in distinct status through COMSOL Multiphysics software. The simulations which performed for air core status and three: 90 degrees, 120 degrees, 180 degrees iron core in D cross section and circular cross section tokamaks, indicated that in both kind of tokamaks, the magnetic confinement occurs in a better status with iron core compared with air core, and 90 degrees iron core is the best status for confinement. Also 25 coils designed in different K and delta which are elongation and triangularity respectively were simulated. The simulation represented that toroidal coils with 1 < K < 1.6 and 0.3

Keywords:Tokamak;Electromagnetic flux