Design of x-ray imaging crystal spectrometer (XICS) for long-pulse (100 s) profile measurements at JT-60SA

JT-60SA is a fusion experiment designed to support the ITER operations and to investigate how best to optimize the operation of fusion power plants that are built after ITER. The x-ray Imaging Crystal Spectrometer (XICS)on JT-60SA is viewed as one of the essential plasma diagnostics which would provide critical information on the local ion impurity density (e.g. n_Ar, n_W, n_Xe), the ion and electron temperatures (T_i,e) as well as the plasma flow velocity components (V_φ,θ). The newly proposed JT-60SA XICS system is a significantly scaled-up, fully calibrated version of the modern XICS systems deployed on fusion experiments including WEST and W7-X, and it is similar in scale to one of the ITER XICS systems presently being designed at PPPL. In this contribution we discuss the design and architecture of the XICS, its integration to the JT60SA tokamak and the engineering challenges that the long pulse scenario (up to 100s with ~40 MW of beam power) with superconducting magnets pose to vacuum interface and electronics. Vacuum and thermal stress analysis and calculations will be presented and discussed including seismic analysis for 0.4g forces. We also present for the first time a new design for a tall chilled 1.6M PILATUS3 detector as well as well as a one-of-a-kind vacuum-compatible in-situ calibration capability using novel Cd, Ti and Ho x-ray tubes which will provide up nine calibration fiducials He-like Ar, H-like Ar, He-like Fe and Ne-like Xe spectra.