Measurement Of Helium-Like And Hydrogen-Like Argon Spectra Using Double-Crystal X-Ray Spectrometers On East

A two-crystal assembly was deployed on the tangential X-ray crystal spectrometer to measure both helium-like and hydrogen-like spectra on EAST. High-quality helium-like and hydrogen-like spectra were observed simultaneously for the first time on one detector for a wide range of plasma parameters. Profiles of line-integrated core ion temperatures inferred from two spectra were consistent. Since tungsten was adopted as the upper divertor material, one tungsten line (W XLIV at 4.017 angstrom) on the short-wavelength side of the Lyman-alpha line (L alpha 1) was identified for typical USN discharges, which was diffracted by a He-like crystal (2d = 4.913 angstrom). Another possible Fe XXV line (1.85 angstrom) was observed to be located on the long-wavelength side of resonance line (w), which was diffracted from a H-like crystal (2d = 4.5622 angstrom) on the second order. Be-like argon lines were also observable that fill the detector space between the He-like and H-like spectra. Published by AIP Publishing.