Abstract
This paper discusses measurements of the soft x-ray emission for Z > 10 impurities in tokamak plasmas for the study of highly ionized atoms. The typical characteristics of the tokamak plasma and their relationship to the x-ray emission are presented. Examples of recent measurements of H- and Helike spectra are given and results obtained, for instance, on wavelength precision measurements (Is Lamb shifts), spectra of transitions from high n Rydberg states, and differences between population mechanisms such as electron impact excitation and charge exchange recombination with thermal neutral hydrogen. The results are discussed in view of future possibilities for the study of highly ionized atoms at higher precision in wavelength (approaching the ppm level for medium Z elements) and line intensities over extended ranges of atomic number and plasma conditions.
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