Simulation and experimental study of a random neutron analyzing system with ²⁵²Cf neutron source

Simulation and experimental study of a random neutron analyzing system with 252 Cf neutron source 1 corresp first-author Corresponding author. E-mail address: coe-fp@cqu.edu.cn Corresponding author. E-mail address: coe-fp@cqu.edu.cn coe-fp@cqu.edu.cn 1 1 1 1 Key Laboratory of Opto-electronics Technology & System, Ministry of Education, Chongqing University, Chongqing 400044, China Key Laboratory of Opto-electronics Technology & System, Ministry of Education, Chongqing University, Chongqing 400044, China Experiments were performed on a high-speed online random neutron analyzing system (HORNA system) with a 252 Cf neutron source (up to 1 GHz sampling rate and 3 input data channel), to obtain time- and frequency- dependent signatures which are sensitive to changes in the composition, fissile mass and configuration of the fissile assembly. The data were acquired by three high-speed synchronized acquisition cards at different detector angles, source-detector distances and block sizes. According to the relationship between 252 Cf source and the ratio of power spectral density, R psd , all the signatures were calculated and analyzed using correlation and periodogram methods. Based on the results, the simulated autocorrelation functions were utilized for identifying different fissile mass with Elman neural network. The experimental results show that the R psd almost remains at constant amplitude in frequency range of 0–100 MHz, and is only related to the angle and source-detector distance. The trained Elman neural network is able to distinguish the characteristics of autocorrelation function and identify different fissile mass. The average identification rate reached 90% with high robustness. 252 Cf Neutron source Random neutron pulse signal Ratio of power spectral density Elman neural network Fissile material identification References Luo Z L , Luo A R . Physics of experimental reactor . Beijing : Atomic Energy Press , 1987 (in Chinese) . Physics of experimental reactor Ding D Z , Ye C T , Zhao Z X . Neutron physics: principle, method and appliance . Beijing : Atomic Energy Press , 2001 (in Chinese) . Neutron physics: principle, method and appliance Liu C A , Wu J . Nuclear arms control and verification technology concept . Beijing : National Defense Industry Press , 2007 (in Chinese) . Nuclear arms control and verification technology concept Mihalczo J T , Mullens J A , Mattingly J K . Tthe U.S. Department of Energy Report No.: Y/LB-15946-R3 , 1997 , 1 - 43 . Tthe U.S. Department of Energy Report No.: Y/LB-15946-R3 Mattingly J K , March-Leuba J A , Mihalczo J T . The U.S. Department of Energy Report No.: Y/LB-15971 , 1998 , 1 - 31 . The U.S. Department of Energy Report No.: Y/LB-15971 Mihalczo J T , Blackman E D , Ragan G E , et al . Nucl Sci Eng , 1990 , 104 : 314 - 338 . Nucl Sci Eng Mullens J A , Mattingly J K , Mihalczo J T . The U.S. Department of Energy Report No.: Y/LB-15968 , 1998 , 1 - 23 . The U.S. Department of Energy Report No.: Y/LB-15968 Zhou B C , He B , Zhu W K , At Energy Sci Technol , 2006 , 40 : 85 - 88 (in Chinese) . At Energy Sci Technol Hao F H , Hu G C , Liu S P . Chin J Phys , 2005 , 54 : 3523 - 3529 Chin J Phys Ren Y , Wei B Mi D L . J Chongqing Univ , 2009 , 32 : 1054 - 1058 (in Chinese) . J Chongqing Univ Wei B , Ren Y , Feng P . High Power Laser Particle Beams , 2009 , 21 : 1898 - 1902 (in Chinese) . High Power Laser Particle Beams Jin J , Wei B , Feng P . High Power Laser Particle Beams , 2010 , 22 : 2441 - 2447 (in Chinese) . High Power Laser Particle Beams Elman J L . Cogn Sci , 1990 , 14 : 179 - 211 . Cogn Sci Cecconi F , Campenni M . Proceedings of the Artificial Intelligence and Applications , 2006 , 216 - 221 . Proceedings of the Artificial Intelligence and Applications Mihalczo J T . Nucl Sci Eng , 1974 , 53 : 393 - 414 . Nucl Sci Eng Mihalczo J T . Blakeman E D , Ragan G E , et al . Nucl Technol , 1990 , 94 : 336 - 360 . Nucl Technol 10.13538/j.1001-8042/nst.22.39-46 Supported by Natural Science Foundation Project of CQ (CSTC2009BB2188) and Fundamental Research Funds for Central Universities (No. CDJXS10120013) 2010-05-20 2011-02-20 2021-01-19 2011 Nuclear Science and Techniques 01 22