Laboratory observation and modeling of extreme ultraviolet spectra of highly ionized calcium

Benchmarking and validation of atomic calculations are crucial for understa nding the properties of astrophysical and fusion plasmas. An extended re-ev aluation of a previous experimental study of the CaXVIII - CaXII extreme ul traviolet (XUV) spectra is presented. CaF2 was introduced into tokamak plas mas and the spectra of the calcium ions were recorded by a photometrically calibrated grazing incidence time-resolved spectrometer. The local plasma e lectron temperature and density were measured independently Nearly all feat ures of the line-of-sight integrated spectra were identified. Atomic data f or this work were generated ab initio with the HULLAC suite of codes. The r esults of colIisional-radiative (CR) modeling for individual charge states agree with the measured spectral line intensities within the experimental a ccuracy for most lines, thus validating the electron temperature and densit y diagnostic potential of the L-shell lines. In addition, we compare experi mentally measured and calculated line intensities with those calculated usi ng the CHIANTI database.