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A special neutron diagnostic system is proposed that facilitates the measurementof neutron fluxes and spectra in the neutronics and tritium production-test blanket module(NT-TBM)without interrupting the operation of the International Thermal-nuclear Experimental Re-actor(ITER),for studying the multiplication rate in the neutron multiplier and breeding ratio oftritium in the breeder.This system includes an encapsulated foil activation system,micro-fissionchamber detectors(MFC),and a compact neutron spectrometer using a natural diamond detector(NDD).A helium coolant loop with a reasonable diameter is designed carefully for every measure-ment channel that ensures that the neutron detectors and preamplifiers would work well under ahigh temperature scenario and that the filling rates of the neutron multiplier(beryllium pebble)and tritium breeder material(Li_4SiO_4)would not decrease excessively(the expected value≥80%)due to the dimensions of the helium coolant loop.
A special neutron diagnostic system is proposed that facilitates the measurement of neutron fluxes and spectra in the neutronics and tritium production-test blanket module (NT-TBM) without interrupting the operation of the International Thermal-nuclear Experimental Re-actor (ITER), for studying the multiplication rate in the neutron multiplier and breeding ratio of troitium in the breeder. This system includes an encapsulated foil activation system, micro-fission chamber detector (MFC), and a compact neutron spectrometer using a natural diamond detector (NDD). A helium coolant loop with a reasonable diameter is designed carefully for every measure-ment channel that ensures that the neutron detectors and pre-fixators would work well under ahigh temperature scenario and that the filling rates of the neutron multiplier (beryllium pebble) and tritium breeder material (Li_4SiO_4) would not decrease excessively (the expected value≥80%) due to the dimensions of the helium coolant coolant.