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借助蒙特卡罗程序MCNP对FEB-E屏蔽问题进行了分析研究。基于143 MW聚变功率和非均匀中子源抽样,首先计算得到平均中子壁负载0.481 MW/m~2,内侧最大中子壁负载0.864 MW/m~2,外侧最大中子壁负载0.861 MW/m~2。根据对沿环向场线圈方向的内侧区域和偏滤器通道区域的中子学分析和计算,得到了可行的屏蔽层设计。由于空间的严格限制,在内侧屏蔽设计中总共使用了17 cm厚的金属钨。为了更有效防止偏滤器通道区域飞行中子的辐照损伤,在该区域的环向场线圈侧壁额外增加25 cm的屏蔽层。FEB-E设计的环向场线圈的总核热约4.2kW,小于55kW的限制条件。
The problem of FEB-E shielding was analyzed by Monte Carlo MCNP. Based on the sampling of 143 MW fusion power and heterogeneous neutron source, the average neutron wall load of 0.481 MW / m ~ 2, the maximum neutron wall load of 0.864 MW / m ~ 2 and the maximum outer neutron wall load of 0.861 MW / m ~ 2. Based on the neutron analysis and calculation of the inner region along the direction of the field coil and the divertor channel, a feasible shield design is obtained. Due to the space constraints, a total of 17 cm thick tungsten metal was used in the inner shield design. In order to more effectively prevent the irradiation damage of the flying neutron in the divertor channel region, an additional 25 cm of shielding layer is added to the circumferential field coil side wall in this region. The total nuclear heat of the toroidal field coil designed by FEB-E is about 4.2kW and less than 55kW.