Research on Regulation method of Neutron Spectrum Based on Basic Response Module Inverse optimization

Neutron energy spectrum is one of the key parameters in nuclear energy system, which directly affects the safe operation and economic performance of the system. In the field of neutronics experiments and some nuclear technology applications, different material modules are usually used to reproduce specific neutron spectrum. The traditional method is based on artificial experience,which requires a lot of calculation and verification,and it is difficult to accurately reproduce the energy spectrum which is necessary for the experiment. In this paper,a method of regulation of neutron energy spectrum based on basic response module inverse optimization is developed. This method designs the basic response module with certain size, and pre-computing each response unit for matrix calibration, it innovatively realizes a fast calculation method of regulation results based on the discrete response matrix. Finally computing the output energy spectrum of each regulation scheme that is the arrangement and combination of basic response module, a neutron regulation scheme for special energy spectrum can be constructed quickly with intelligent optimization algorithm. Using the above method, the energy spectrum control scheme for ITER activation experiment of national thermonuclear reactor is reconstructed. Comparison of the target energy spectrum, the regulation energy spectrum is much closer than the manual results and the max deviation is reduced by an order of magnitude. (authors)