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Benchmarking and validation of atomic calcula- tions are crucial for understanding the properties of astro- physical and fusion plasmas. An extended re-evaluation of a previous experimental study of the Ca XVIII {C aXII extreme ultraviolet (XUV) spectra is presented. CaF2 was introduced into tokamak plasmas and the spectra of the calcium ions were recorded by a photometrically cali- brated grazing incidence time-resolved spectrometer. The local plasma electron temperature and density were mea- sured independently. Nearly all features of the line-of-sight integrated spectra were identied. Atomic data for this work were generated ab initio with the HULLAC suite of codes. The results of collisional-radiative (CR) modeling for individual charge states agree with the measured spec- tral line intensities within the experimental accuracy for most lines, thus validating the electron temperature and density diagnostic potential of the L-shell lines. In addi- tion, we compare experimentally measured and calculated line intensities with those calculated using the CHIANTI database.

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