The spectrum of highly ionized praseodymium and dysprosium from the Texas tokamak plasma in the 50–250-Å range

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Abstract
Spectra of highly ionized praseodymium and dysprosium recorded from the Texas tokamak (TEXT) plasma have been analyzed in the 50–250‐Å range. The spectra contain high‐intensity continuum bands in the region below 100 Å and bright individual lines above this wavelength. Lines of highly ionized praseodymium and dysprosium have been identified. The highest ionization state reached in the 1‐keV central electron temperature tokamak plasma was Cu i‐like Pr xxxi. The composition of the bands is explained in terms of a new theoretical approach developed to treat large unresolved transition arrays. The brightness of the continuum is compared with that of intense spectral lines emitted in the same wavelength range.