Preliminary validation of ITER magnetic diagnostic algorithms by using JT-60SA magnetic measurements

A validation of the ITER real-time reconstruction algorithms for the plasma current, centroid position, boundary and for the poloidal beta has been performed using the data collected during the first operation of the JT-60SA tokamak. The accuracy of the reconstruction is evaluated against plasma equilibria computed with the CREATE-NL nonlinear code. As it will be shown, although the setup of the magnetic sensors during JT-60SA first operation included a reduced number of sensors compared to what envisaged in the ITER setup and for JT-60SA next campaigns, the ITER requirement on the estimation of the plasma current are met. This is not the case for the plasma centroid position and shape due to the small number of available flux loops and the absence of Mirnov coils which measure the normal component of the magnetic field. The obtained results for the real-time estimation of the plasma position and shape are anyway promising, taking into account that the lacking measurements will be available in the future, both for JT-60SA and at ITER. Finally, a fast method for the poloidal beta estimation is compared with the JT-60SA poloidal beta real-time estimation algorithm.