Soft X ray tomographic imaging in the RFX reversed field pinch

SXR cross-sectional distributions measured in the European reversed field p inch (RFP) experiment RFX by means of a tomographic diagnostic are describe d. Various reconstruction techniques have been compared. A correction techn ique to minimize the systematic effect due to the non-identical thicknesses of the material filters has been developed. A number of experimental situa tions have been explored, and a study of the correlation between the MHD an d SXR properties of the plasma has been made. The analysis concentrates bot h on standard discharges and on the recently discovered quasi-single-helici ty states, whose signature is the growth of a sizeable m = 1 structure in t he emissivity distributions. Detailed imaging of the plasma in these condit ions is presented.