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An important goal of magnetic-field study in tokamak machines is to determine and reconstruct the magnetic isoflux surface characterizing the plasma boundary condition and the full mapping of the magnetic surfaces inside that isoflux surface. This task can be accomplished by using the multipolar moment method which results from the homogenous solution of the Grad-Shafranov equation. The real-time reconstruction of a magnetic-field map is important to evaluate some quantities that can be used to control the plasma. This paper addresses the real-time implementation of that task.