Study of highly ionized Xe spectra with 3s–3p and 3p–3d transitions in JT-60U reversed shear plasmas

Abstract In JT-60U, Xe gas has been injected into reversed shear plasmas with internal transport barriers. During these discharges, spectra from highly ionized Xe atoms have been observed in a wavelength range of 4–16 nm. The observed spectra have been analyzed by calculating theoretical spectra for Xe XXXVII–XLV 3s–3p and 3p–3d transitions with relativistic atomic structure codes, a collisional radiative model, and an impurity transport code. Several lines for Xe XLI and XLII have been newly identified. Soft X-ray emission profiles have also been analyzed, and the results showed that the Xe ions accumulated inside the internal transport barrier.