聚变堆深穿透屏蔽计算方法研究

为了提高具有复杂孔道的聚变堆深穿透屏蔽问题的计算精度，研究了蒙特卡罗法和离散纵标法(MC-S_N)的耦合方法。同时，在权重差分方法的基础上引入具有自适应特性的定向权重和指数定向权重方法，并基于勒让德-切比雪夫求积组和极角细化技术研究了偏倚求积组，有效解决聚变中子穿透能力强、强各向异性散射等屏蔽计算难点。通过与MCNP程序模拟结果的比较分析发现，这些研究方法能有效提高聚变堆深穿透屏蔽计算的精度。

Deep penetration shielding calculation method for fusion reactors

In order to improve the computational accuracy of fusion reactor deep penetration shielding problems with complex streaming gaps, MC-SN coupling method is developed. Based on the Theta Weighted differencing scheme, the Directional Theta Weighted and Exponential Directional Weighted differencing schemes, which have adaptive features, are introduced. Biased quadrature sets are also constructed on base of Legendre-Chebyshev sets and angular refinement technique to deal with shielding calculation problems of strong fusion neutron penetration and anisotropic scattering. Through the comparative analysis with MCNP simulation results, it can be found that these methods can effectively improve the accuracy for some deep penetration shielding calculation in fusion reactors.