摘要
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 （NTTBM） without interrupting the operation of the International Thermal-nuclear Experimental Reactor （ITER）, for studying the multiplication rate in the neutron multiplier and breeding ratio of tritium in the breeder. This system includes an encapsulated foil activation system, micro-fission chamber 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 measurement channel that ensures that the neutron detectors and preamplifiers would work well under a high temperature scenario and that the filling rates of the neutron multiplier （beryllium pebble） and tritium breeder material （Li4SiO4） 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 （NTTBM） without interrupting the operation of the International Thermal-nuclear Experimental Reactor （ITER）, for studying the multiplication rate in the neutron multiplier and breeding ratio of tritium in the breeder. This system includes an encapsulated foil activation system, micro-fission chamber 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 measurement channel that ensures that the neutron detectors and preamplifiers would work well under a high temperature scenario and that the filling rates of the neutron multiplier （beryllium pebble） and tritium breeder material （Li4SiO4） would not decrease excessively （the expected value〉80%） due to the dimensions of the helium coolant loop.
基金
National Natural Science Foundation of China(No.10175021)
