Theoretical reflectivities of bent crystal analyzers for fusion plasma diagnostics

The performances of curved crystal analyzers used in the plasma diagnostic spectrometers at several fusion laboratories are evaluated by means of a physical model based on the dynamical theory of x-ray diffraction. We present reflectivity curves and diffraction parameters calculated as a function of the crystal curvature for different wavelengths corresponding to the most relevant spectra of metal impurity ions present in high-energy laboratory plasma sources.