不同扫描模式下中子源锂靶温度场的数值模拟

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关键词：加速器中子源；锂靶；温度场；束斑；扫描模式

中图分类号：0571.53文献标志码：A

DOI：10.7652/xjtuxb202510019 文章编号：0253-987X（2025）10-0200-10

Numerical Simulation of Temperature Field in Lithium Target of Neutron Source under Different Scanning Modes

LI Jinglun ，HU Yaocheng1，2，3， SU Haoquan 1，2，3 ，CHEN Yongqi 1，2，3 LI Haipeng1，2，3 ， WANG Sheng1，2，3 （1.School of Nuclear Science and Technology，Xi'an Jiaotong University，Xi'an 71o049，China; 2.Huzhou Neutron Science Laboratory，Xi'an Jiaotong University，Huzhou，Zhejiang 3l30o，China; 3.Hua Boron Neutron Technology（Hangzhou） Co.，Ltd.，Hangzhou 3loooo，China）

Abstract： To address the issue of lithium target melting caused by rapid temperature rise under high-power beam irradiation in accelerator neutron sources，a beam spot homogenization scheme combining“beam expansion + scanning”is proposed. First，the software MATLAB is used to simulate the distribution of particles and temperature field on the target under different scanning modes. Then，the software FLUENT is employed to analyze the impact of different initial beam spot widths on the lithium target’s temperature field. Finally， the variations in the lithium target's temperature field under different scanning frequencies are investigated. The simulation results indicate that the“beam expansion + scanning" homogenization method effectively reduces the peak surface temperature of the target during proton bombardment. The sawtooth wave mode achieves the most uniform particle distribution on the target，compared to sine and triangular wave modes，reducing the peak surface temperature by 8% and 2% ，respectively. Smaller initial beam spot widths and higher scanning frequencies both contribute to lowering the peak surface temperature of the lithium target under high-power beam irradiation. The optimal scanning strategy involves using a sawtooth wave mode with a scanning frequency of 300Hz and an initial rectangular beam spot width of 30mm . This study provides valuable insights for the design of lithium targets in accelerator neutron sources.

Keywords： accelerator neutron source； lithium target; temperature field; beam spot； scanningmode

由于中子的高穿透性，其在工业探伤领域具有广阔的应用前景。（剩余14236字）