微通道板对硬X射线探测效率的模拟研究

杨靖; 单连强

doi:10.11858/gywlxb.20251193

微通道板对硬X射线探测效率的模拟研究

doi: 10.11858/gywlxb.20251193

杨靖^1,*, ,,
单连强²

1.
中国工程物理研究院流体物理研究所冲击波物理与爆轰物理全国重点实验室, 四川绵阳　621999
2.
中国工程物理研究院激光聚变研究中心等离子体物理全国重点实验室, 四川绵阳　621999

基金项目: 冲击波物理与爆轰物理全国重点实验室基金（JCKYS2025212109）

详细信息

通讯作者:
杨　靖（1985－），男，博士，副研究员，主要从事高压材料物性及测试技术研究. E-mail：yangjing_2025@163.com

中图分类号: O521.3; TL817.2
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出版历程
- 收稿日期: 2025-09-09
- 修回日期: 2025-11-02
- 录用日期: 2026-01-27
- 网络出版日期: 2025-11-11
- 刊出日期: 2026-06-05

Simulation Study on Hard X-Ray Detection Efficiency for Microchannel Plate

YANG Jing^{1,*
, ,},
SHAN Lianqiang²

1.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Laboratory of Science and Technology on Plasma Physics, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

摘要

摘要: 为提升硬X射线的探测效率，优化了微通道板对硬X射线响应效率的影响模型，在模型中充分考虑了微通道板多种材料参数、结构参数以及微通道板基底材料原子壳层间相互串扰等因素的影响。在此模型的基础上，分析了微通道板的基底材质、通道直径、通道间壁厚、通道板厚度等参数对其探测效率的影响。基于现有技术条件，给出了微通道板各参数的最优组合及相应的探测效率，结果表明，其对50～200 keV能段硬X射线的探测效率可以达到45%以上。
- 微通道板 /
- 硬X射线 /
- 探测效率
Abstract: An optimized influence model of the microchannel plate on the response efficiency of hard X-rays was developed to improve the detection efficiency of hard X-rays. This model incorporates relevant material and structural parameters of the MCP, and further accounts for the crosstalk effects among atomic shells of the substrate material. Based on this model, the influence of key parameters—including substrate material, channel diameter, inter-channel wall thickness, and overall plate thickness—on the detection efficiency was analyzed. Considering current technological constraints, optimal values for these parameters and the corresponding detection efficiency were determined. The results indicate that the detection efficiency for hard X-rays in the 50–200 keV energy range can exceed 45%.
- microchannel plate /
- hard X-ray /
- detection efficiency

HTML全文

图 1 微通道板的结构示意图：(a) 正面，d为微孔直径，w为相邻微孔间的最小距离；(b) 侧剖面，L为微通道板厚度，φ为微通道板斜切角

Figure 1. Schematic diagram of the MCP: (a) top view, d represents the diameter of micropores, w represents the minimum distance between adjacent micropores; (b) side section, L represents the thickness of the MCP, and φ represents bias angle

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图 2 本研究模型与Farley所用模型计算结果的对比：(a) 在同一组优化参数下探测效率随着MCP厚度的变化；(b) 在Farley所使用的参数下2种模型的探测效率随入射X射线能量的变化

Figure 2. Comparison of calculation results between the model used in this work and the model employed by Farley: (a) detection efficiency as a function of the MCP thickness under the same set of optimization parameters; (b) detection efficiency of the two models as a function of incident energy of X-ray under the parameters used by Farley

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图 3 MCP的结构参数一致时不同材料MCP对硬X射线探测效率的对比

Figure 3. Detection efficiency comparison of the MCPs made of different materials for hard X-rays under identical structural parameters

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图 4 对硬X射线的探测效率与MCP厚度的关系曲线

Figure 4. Detection efficiency for hard X-rays as a function of the MCP thickness

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图 5 对硬X射线的探测效率与MCP通道直径的关系曲线

Figure 5. Detection efficiency for hard X-rays as a function of the MCP channel diameter

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图 6 不同入射X射线能量下探测效率与MCP通道间最小壁厚的关系曲线

Figure 6. Detection efficiency as a function of the minimum inter-channel wall thickness at different incident X-ray energies

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图 7 不同通道直径下探测效率与MCP通道间最小壁厚的关系曲线

Figure 7. Relationship between detection efficiency and the minimum inter-channel wall thickness of the MCP under different channel diameters

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图 8 优化参数下的MCP对硬X射线的探测效率曲线

Figure 8. Detection efficiency of the optimized MCP for hard X-rays

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表 1 铅、钡、硅和氧的光电效应截面（光子能量为100 keV）

Table 1. Photoelectron cross-section data for lead, barium, silicon, and oxygen (100 keV photon energy)

Lead (n=2.65)			Barium (n=2.83)			Silicon (n=3.00)			Oxygen (n=3.15)
Shell	E_bind/ keV	μ_shell/ (cm²·g⁻¹)	Shell	E_bind/ keV	μ_shell/ (cm²·g⁻¹)	Shell	E_bind/ keV	μ_shell/ (cm²·g⁻¹)	Shell	E_bind/ keV	μ_shell/ (cm²·g⁻¹)
K	88.00	4.130	K	37.15	1.68	K	1.84	0.022 5	h.s	<1.00	0.003 1
L	14.32	0.846	L	5.63	0.23	h.s.	<1.00	0.002 5
M	2.70	0.198	h.s	<1.00	0.06
h.s.	<1.00	0.062

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