Successful applications of the vertical-geometry Johann spectrometer (VJS) in advanced plasma spectroscopy are reported. Different experimental configurations are discussed, and a complete quantitative analysis of the spectrometer function including the transfer of the spectral lines is presented. The method for reconstruction of the spectra emitted from extended, quasilinear sources is described; the precision attainable and possible sources of errors are discussed. Due to the combination of high collection efficiency, and spectral and one-dimensional spatial resolution, the instrument is particularly suitable for high-precision measurements of the spectral line profiles and positions in nonhomogeneous plasmas. The examples of experimental results, which are superior to those obtained in earlier measurements, demonstrate the VJS performance and suggest a broad field of possible applications.

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