Design study for International Thermonuclear Experimental Reactor high resolution x-ray spectroscopy array

The impurity line and continuum emission for International Thermonuclear Experimental Reactor (ITER) reference H-mode and Internal Transport Barrier (ITB) plasmas were modeled using the SANCO impurity transport code. Using the instrument sensitivity for a spatially resolving crystal spectrometer array with doubly-curved crystals and two-dimensional detectors, signals, and signal-to-noise ratios were calculated for impurities including argon, iron, and krypton. These were shown to have lines suitable for the measurement of the ion temperature (0.5–30 keV) and the rotation over almost the entire plasma minor radius. The main contribution to the signal-to-noise is the plasma continuum radiation on which the lines are superimposed. The tolerable impurity concentration is limited by the incremental radiated power ΔP_rad, there being a broad operating range between about 100 kW and 10 MW. The spectrometer array has now been integrated into the ITER design. A quasitomographic technique to reconstruct the T_i and rotation profiles, is reported by Ingesson etal [C. Ingesson, these proceedings].