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The diagnostic will have seven measurement volumes across the ITER cross section and will resolve the alpha particle energies in the range from 300\u00a0keV to 3.5\u00a0MeV; importantly, the CTS diagnostic is the only diagnostic capable of measuring confined alpha particles for energies below \u223c1.7\u00a0MeV and will also be sensitive to the other fast-ion populations. The temporal resolution is 100\u00a0ms, allowing the capture of dynamics on that timescale, and the typical spatial resolution is 10\u201350\u00a0cm. The development and design of the in-vessel and primary parts of the CTS diagnostic has been completed. 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