Scintillating Fibre Neutron Spectrometer
A neutron spectrometer consisting of a number of square shaped hydrogen based scintillating fibres is described. The considered design will have an efficiency of 3·10-3 cm2 for 14-MeV neutrons and is suitable for measurements of energy spectra of collimated fluxes ranging from 106 to 108 n/(cm2s). The energy resolution is ≅ 3.3% (FWHM) which permits ion temperature measurements for Ti ≥ 7 keV with ΔTi/Ti≤ 10%. The detector has high efficiency that makes it particularly useful for measurements of energy spectra of collimated neutron beams in a radial profile monitor in ITER. The objective of these measurements is to evaluate ion temperature radial profiles. A time resolution of 100 - 1 ms and a radial resolution of 1–3 cm is provided.
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