在加速器驱动次临界系统(Accelerator Driven Sub-critical Systems,ADS)中,散裂源中子能量可以到达上百Me V甚至Ge V,能谱分布非常复杂,已有的工作核数据库的截面数据无法满足其设计要求。传统工作核数据库的制作方法人工操作干预过多、耗时、繁琐且易出错,为此,开发出自动生成数据库程序。该程序在设计的能群结构、权重函数等参数基础上,通过程序自动生成适用于ADS系统的点状ACE格式和471群MATXS格式核数据库ANDL-ADS(Auto-generated Nuclear Date Library for ADS),支持高能中子(能量上限为150 Me V/200 Me V)的截面制作,并可根据需求进行多温截面的制作。通过不同材料的临界球、积分泄露率、高能屏蔽等基准例题的测试,初步验证了ANDL-ADS数据库的可靠性。
The typical burnup feature in ADS system is that ADS needs more specific depletion chains for heavy nuclides and rational simplified depletion chains for LLFP.These depletion chains can be represented as set of first-order differential equations by means of transmutation trajectory analysis(TTA)method,and be solved using explicit analysis method,which is referred as Bateman equations.The applicability of this method has already been demonstrated by some famous codes,such as CINDER and BISON.There are also some other methods to solve burnup equations,for example,the exponent matrix method used in ORIGEN2 code and Chebyshev rational approximation method(CRAM)employed in burnup module of Serpent code.However,some general burnup codes have certain limitations,for instance,treating a series of important fission products including LLFP as pseudo nuclides or lacking several crucial MA isotopes.
加速器驱动次临界系统注入器Ⅰ,包括ECR离子源、低能传输线、射频四极加速单元、中能传输段和超导腔,注入器Ⅰ出口能够获得能量10 Me V的强流质子束流。为了调束和运行的需要,注入器Ⅰ将安装束流位置测量、束流截面测量、束流流强测量、束流发射度和能量测量,以及束流损失测量等束流参数测量装置。介绍了这些束流测量系统设计及其他方面的一些考虑。