Effects of Neutron Source Models on Neutron Wall Loading in the EAST Tokamak
Effects of Neutron Source Models on Neutron Wall Loading in the EAST Tokamak
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DOI：
10.1080/15361055.2023.2234224
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发表时间：
2023-08
影响因子：
0.9
通讯作者：
Wenjun Yang;C. Lan;Guoqiang Li;Xueyu Gong;Xiangping Gao
中科院分区：
文献类型：
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作者：
Wenjun Yang;C. Lan;Guoqiang Li;Xueyu Gong;Xiangping Gao
等离子体中子源作为托卡马克装置中子分析的重要输入，是连接聚变等离子体物理和工程设计的桥梁。建立了基于EAST等离子体配置的等离子体中子源模型。最大中子壁载荷（NWL）在外侧背板附近，大于内侧背板的约20%。研究表明，对位于机外背板和机内背板上的关键部件的辐射屏蔽和防护应特别注意。在EAST托卡马克D-D等离子体操作中，必须仔细考虑氚积累对中子分析的影响。本文还研究了密度峰（DP）对中子分析的影响。可以明显地看出，这些波峰都在靠近外侧中平面的位置，且波峰的极向分布略有不同。随着DP的增加，船内和船外的NWLs峰值均减小。然而，NWL的下降非常小；当中子源峰增加约1.5倍时，NWL仅降低11%。
Abstract As a significant input for neutronics analysis of tokamak devices, the plasma neutron source is a bridge connecting fusion plasma physics and engineering design. A plasma neutron source model is established based on the EAST plasma configuration. The maximum neutron wall loading (NWL) is near the outboard midplane and is more than ~20% that of the inboard midplane. The investigations demonstrate that special care should be taken for radiation shielding and protection of the key components located on the outboard midplane and on the inboard midplane. The effect of the tritium accumulation on neutronics analysis should be carefully considered for EAST tokamak D-D plasma operations. The effect of density peaking (DP) on the neutronics analysis is also investigated. It is evident that the peak NWLs are all near the outboard midplane and that the poloidal distributions of the NWL are slightly different for these cases. With increasing DP, both the outboard and inboard peak NWLs decrease. However, the decrease in NWL is very small; NWL decreases only 11% when the neutron source peak increases about 1.5 times.