3D equilibrum reconstruction for the RFP with V3FIT

Helical states are routinely found in all Reversed Field Pinch experiments and their description requires a 3D equilibrium reconstruction. We present the application of the V3FIT code for the RFX-mod experiment. Magnetic and kinetic diagnostics ($T_e$ from Thomson scattering, SXR emissivity, $N_e$ from interferometer) are used in order to properly deal with the problem of degeneracy when only external magnetic measurements are used. A sensitivity study of external measurements on the internal topological structure is also presented, showing a link between external measurements and internal profiles. Fixed-boundary equilibria can be computed by independently calculating vacuum fields. The results provide a good match with experimental data and the obtained equilibria are suitable for both transport and stability analysis.