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

LI Jinglun; HU Yaocheng; SU Haoquan; CHEN Yongqi; LI Haipeng; WANG Sheng

doi:10.7652/xjtuxb202510019

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

更新时间：2025-09-28

- Numerical Simulation of Temperature Field in Lithium Target of Neutron Source under Different Scanning Modes
- Journal of Xi'an Jiaotong University Vol. 59, Issue 10, Pages: 200-209(2025)
- 作者机构：
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- DOI：10.7652/xjtuxb202510019
  CLC： O571.53
- Received：14 April 2025，
  
  Published：10 October 2025
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LI Jinglun, HU Yaocheng, SU Haoquan, et al. Numerical Simulation of Temperature Field in Lithium Target of Neutron Source under Different Scanning Modes[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 200-209.
DOI：

LI Jinglun, HU Yaocheng, SU Haoquan, et al. Numerical Simulation of Temperature Field in Lithium Target of Neutron Source under Different Scanning Modes[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 200-209. DOI： 10.7652/xjtuxb202510019.

摘要

针对加速器中子源锂靶在高功率束流照射下急剧升温易造成锂靶熔毁的问题，提出了一种“扩束+扫描”的束斑均匀化方案。首先，采用MATLAB软件模拟不同扫描模式下粒子在靶上的分布情况以及靶上的温度场分布；然后，通过FLUENT软件分析了不同初始束斑宽度对锂靶温度场的影响；最后，研究了不同扫描频率下锂靶的温度场变化。模拟结果表明：“扩束+扫描”的束斑均匀化方法能有效降低质子打靶时靶面的最高温度；锯齿波模式下靶上的粒子分布均匀性最佳，相较于正弦波与三角波模式，靶面最高温度分别降低了8%、2%；更小的初始束斑宽度和更高的扫描频率均能降低高功率束流打靶过程中锂靶表面的最高温度；最佳扫描策略是以扫描频率为300Hz、长方形初始束斑宽度为30mm的锯齿波模式进行扫描。该研究可为加速器中子源锂靶的设计提供参考。

Abstract

To address the issue of lithium targetmelting 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 scanningmodes. 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”homogenizationmethod effectively reduces the peak surface temperature of the target during proton bombardment. The sawtooth wavemode achieves themost uniform particle distribution on the target

compared to sine and triangular wavemodes

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 wavemode 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.

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references

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