Sensitivity analysis of low-order plasma moments reconstruction for RFX-mod2 tokamak operations

The reconstruction of total plasma current and plasma centroid position from low-order moments of toroidal current density is presented for RFX-mod2 shaped tokamak equilibria. DEMO-like shape conditions and negative triangularity plasmas are considered in the analysis. The impact of a single sensor failure on the reconstruction is investigated by performing a sensitivity analysis at each possible poloidal position of the faulty sensor. The effects of using mono-axial or bi-axial sensors are also quantified. The minimum number of sensors necessary to estimate both the total plasma current and the centroid position within a certain level of accuracy has been assessed for the wide plasma shape conditions of the considered equilibria.