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由于keV能区中子与C、H元素散射截面很大,冷却剂不能直接在靶头底衬上循环,采用冷却剂在靶头壁周围循环结构,以尽可能减小散射中子的影响。利用Target(PTB98版)程序模拟计算了Ta和Cu两种材料靶头散射中子能谱,如图1所示,结果表明,靶头材料采用Ta比Cu可减小40%的散射中子,但Ta的导热系数为54W/(m·K),而Cu的导热系数与其合金成分有较大关系,黄铜为110W/(m·K),而纯铜为401W/(m·K)。试制阶段采用的靶头材料为黄铜,靶底衬为Ta,结构
Because keV energy neutrons and C, H elements have a large scattering cross-section, the coolant can not directly circulate on the target substrate, and the coolant circulates around the target wall to minimize the effects of scattered neutrons. The Target (PTB98) program was used to simulate the scattering neutron energy spectra of the Ta and Cu materials. As shown in Fig. 1, the results show that the Ta material can reduce the scattering neutron by 40% However, the thermal conductivity of Ta is 54 W / (m · K), while the thermal conductivity of Cu has a great relationship with the alloy composition, with 110 W / (m · K) brass and 401 W / (m · K) pure copper. The target material used in the trial stage is brass and the target backing is Ta