The effects of inboard materials on the size of a tokamak fusion reactor were studied based on reactor system parameters determined through a coupled analysis of tokamak systems and neutron transport. With an inboard blanket, the shielding capability was the best for tungsten carbide (WC), showing a smaller reactor size than cases using other shield materials. Shield materials such as WC, borated steel (BS), and ferritic/martensite steel (FMS) showed improved neutron economy for tritium breeding in the blanket, which was attributed to neutrons reflected by tungsten (W) and steel (Fe). In a configuration with only an outboard breeding blanket, it was found that the tritium self-sufficiency requirement could be satisfied with an inboard blanket replaced by a neutron multiplier and/or reflector materials. Titanium carbide (TiC) showed the best neutron reflecting capability. With lead (Pb) as a neutron multiplier, neutron spectrum softening by a Pb multiplier enhanced the reflector performance and increased tritium breeding at the outboard blanket. Thus, an optimum combination of multiplier and reflector materials can lead to smaller reactor sizes than reactors with an inboard blanket.

基于通过对托卡马克系统和中子传输的耦合分析确定的反应堆系统参数，研究了内侧材料对托卡马克聚变反应堆尺寸的影响。使用内侧毯子时，碳化钨 (WC) 的屏蔽能力最好，与使用其他屏蔽材料的情况相比，反应堆尺寸更小。WC、硼化钢 (BS) 和铁素体/马氏体钢 (FMS) 等屏蔽材料显示出改善了覆盖层中氚增殖的中子经济性，这归因于钨 (W) 和钢 (Fe) 反射的中子。在仅具有外侧繁殖毯的配置中，发现用中子倍增器和/或反射器材料代替内侧毯可以满足氚自给自足的要求。碳化钛 (TiC) 显示出最好的中子反射能力。使用铅 (Pb) 作为中子倍增器，通过 Pb 倍增器软化中子光谱增强了反射器性能并增加了舷外毯中氚的繁殖。因此，倍增器和反射器材料的最佳组合可导致反应器尺寸比具有内侧覆盖层的反应器更小。