Preliminary Design of Neutron Flux and Spectrum Diagnostics in NT-TBM  

作　　者：杨进蔚 冯开明 程志 

机构地区：[1]Southwestern Institute of Physics,Chengdu 610041,China

出　　处：《Plasma Science and Technology》2007年第2期219-222,共4页等离子体科学和技术（英文版）

基　　金：National Natural Science Foundation of China(No.10175021)

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.

关 键 词：neutronics and tritium production-test blanket module （NT-TBM） fission chamber detector encapsulated foil activation system 

分 类 号：O571.54[理学—粒子物理与原子核物理]