Deduction of central plasma parameters from line-of-sight averaged spectroscopic observations

A method is presented to deduce central ion temperature and toroidal rotation velocity from line‐of‐sight averaged x‐ray spectra from hot plasmas. The analysis is based on atomic data for the processes that give rise to x‐ray spectral lines. Combined with measured electron temperature and density profiles a synthetic spectrum is calculated. The fit of this synthetic spectrum to the observed one gives a new level of accuracy to line‐of‐sight integrated observations in a considerably extended range of ion temperatures and toroidal rotation velocities. The choice of model for radial profiles for ion temperature and toroidal rotation velocity is shown not to be critical. The concentration of the emitting impurity is deduced from the total line intensity, making use of the absolute calibration of the detector sensitivity. The effective plasma charge Zeff is derived from the absolute level of the continuum radiation. These measurements are based on atomic data for x‐ray line and continuum radiation and measured...