Edge-Cooling Target Structure for Transportable Accelerator-Driven Neutron Source

doi:10.7652/xjtuxb202306018

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Edge-Cooling Target Structure for Transportable Accelerator-Driven Neutron Source

更新时间：2025-05-08

- Edge-Cooling Target Structure for Transportable Accelerator-Driven Neutron Source
- Vol. 57, Issue 6, Pages: 160-171(2023)
- 作者机构：
  
  1. 西安交通大学核科学与技术学院,西安,710049
  2. 中国原子能科学研究院核技术综合研究所,北京,102413
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202306018
  CLC： O571.53
- Online First：10 June 2023，
  
  Published：2023
- 稿件说明：
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Edge-Cooling Target Structure for Transportable Accelerator-Driven Neutron Source[J]. 2023, 57(6): 160-171.
DOI：

Edge-Cooling Target Structure for Transportable Accelerator-Driven Neutron Source[J]. 2023, 57(6): 160-171. DOI： 10.7652/xjtuxb202306018.

摘要

为解决车载加速器中子源锂靶出射中子衰减的问题

提出了冷却水在侧面流动的边缘冷却靶结构

研究其辐照损伤、冷却效果和出射中子品质等性能。在靶结构中引入由钒制成的中间层

从氢原子扩散和辐照损伤的角度分析了质子对靶结构材料的影响; 基于有限元软件COMSOL Multiphysics

建立了不同质子束流轰击下的共轭传热模型来预测锂靶温度

并通过实验进行了验证; 采用蒙特卡罗方法比较了靶结构的前冲方向中子产额

并对边缘冷却靶结构的感生放射性进行了评估。结果表明:钒中间层的引入可以有效促进氢原子的扩散和容纳过程

减轻氢脆对铜基板的影响; 对于功率为250 W、半径大于0.75 cm的高斯分布质子束斑

边缘冷却靶结构的最高温度可以控制在140 ℃以下

冷却模拟结果相比于实验结果更为保守; 边缘冷却靶结构在前冲方向的中子产额损失更小

具有10%左右的优势。边缘冷却靶结构在保证高效冷却的基础上

提高了前冲方向的中子产额

在车载加速器中子源上具有长寿且可靠运行的潜力

可为靶结构的相关研究提供参考。

Abstract

To solve the problem of emitted neutron attenuation of lithium target of the transportable accelerator-driven neutron source(TANS)

the edge-cooling target structure in which the cooling water circulates through a channel along the side of substrate

was proposed

and its performance was studied such as irradiation damage

cooling effect

and quality of emitted neutron. Vanadium interlayer was introduced in the target structure

and proton effect on target structural materials was tentatively analyzed from perspectives of hydrogen diffusion and irradiation damage. Based on the software using finite element method

COMSOL Multiphysics

conjugate heat transfer models under proton beams with different distributions were built for the evaluation of lithium target temperature. The accuracy of simulation result was verified by cooling experiment. The neutron yields of target structures in forward direction were compared according to calculation using the Monte Carlo method. And the induced radioactivity of edge-cooling target structure was evaluated. The results showed that the vanadium interlayer could effectively promote the process of hydrogen diffusion and absorption

and reduce the influence of hydrogen embrittlement on copper substrate. The maximum temperature of lithium target under 250 W proton beam in Gaussian distribution with a radius greater than 0.75 cm was predicted to be below 140 ℃ for edge-cooling target structure

and simulation results were more conservative than the experimental results. The edge-cooling target structure had a less reduction on neutron yield in forward direction

and the advantage was about 10%. On the basis of efficient cooling

the edge-cooling target structure can increase the neutron yield in forward direction

and has the ability of long life and reliable operation on TANS. Meanwhile

this study can provide reference for the related research of target structure.

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references

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