In this study, the dynamic characteristics of accelerator-driven subcritical reactor (ADSR) under beam transients with high heterogeneity of neutron flux in time-space are investigated. Multi-mode core few-group constants are generated by three kinds of neutron fluxes: steady state of ADSR, λ-eigenvalue fundamental wave, and α-eigenvalue fundamental wave. The proposed few-group constants overcome the limitation of single few-group constant generated by two-step method that cannot consider the variation in neutron flux density and neutron energy spectrum with time and space. Compared to the existing few-group constants generated by two-step method under different operating conditions, the self-adapting multi-mode core few-group constants exhibit higher accuracy in the case of following two modes: steady-state mode of ADSR in the starting process and λ-eigenvalue mode in the beam trip condition. Overall, this research provides useful insights on neutron kinetics and can boost the development of ADSRs.

在这项研究中，研究了加速器驱动的亚临界反应堆（ADSR）在具有高时空中子通量非均质性的射束瞬变下的动力学特性。多模堆芯少数群常数由三种中子通量产生：ADSR的稳态，λ特征值基波和α特征值基波。所提出的少数群常数克服了两步法产生的单一少数群常数的局限性，后者不能考虑中子通量密度和中子能谱随时间和空间的变化。与通过两步法在不同工作条件下生成的现有少数组常数相比，自适应多模式核心少数组常数在以下两种模式下显示出更高的精度：在启动过程中，ADSR处于稳态模式，而在光束跳闸条件下处于λ特征值模式。总的来说，这项研究为中子动力学提供了有用的见解，并可以促进ADSR的发展。