Measurement of plasma current in damavand tokamak using magnetic probes assembly as a discrete rogowski coil

Abstract

In this paper, the magnetic probes assembly of Damavand tokamak which is being used for measurement of local magnetic fields, were utilized as a discrete Rogowski coil inside the vacuum vessel.An important advantage of this approach is the insensitivity of the new Rogowski coil to magnetic fields created by the external ohmic and equilibrium coils. Thae theoretical basis for the calculation of magnetic fields in the space between two probes was discussed and verified with experimental data. The lowest error was obtained in the second-order finite element computational method for discretizing Ampere's Law Integral. Moreover, the stability of measured currents considering error for magnetic field measurement was investigated. According to the results, it was found that Damavand Tokamak magnetic probes with the finite element second-order calculation method could be used as a more accurate discrete Rogowski coil than the machine main Rogowski coil.

Keywords

• tokamak
• plasma current
• magnetic probes
• rogowski coil