用于直线感应加速器光源焦斑测量的双锥厚针孔结构设计

王毅; 李勤; 刘云龙; 龙全红; 代志勇

doi:10.11884/HPLPB201931.180291

用于直线感应加速器光源焦斑测量的双锥厚针孔结构设计

doi: 10.11884/HPLPB201931.180291

中国工程物理研究院流体物理研究所, 脉冲功率科学与技术重点实验室, 四川绵阳 621900

基金项目:

国家自然科学基金项目 11875242

详细信息

作者简介:
王毅(1983-)，男，博士，从事强流电子束及X光探测技术研究；wangyi_caep@163.com

中图分类号: O434.1
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出版历程
- 收稿日期: 2018-10-29
- 修回日期: 2019-03-25
- 刊出日期: 2019-07-15

Structure design of thick pinhole with double cones for spot size measurement of the linear induction accelerator light source

Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAEP, Mianyang 621900, China

摘要

摘要: 研究设计双锥厚针孔结构体，利用小孔成像测量高能强流直线感应加速器光源的焦斑。建立数值计算模型，根据实际光源特性和实验布局条件，模拟光子穿过厚针孔结构的辐射成像过程，分析光源尺寸、分布和偏轴等对焦斑测量的影响。理论计算结果显示对光源物面的空间分辨率可达5 lp/mm。
- 直线感应加速器 /
- 焦斑 /
- 厚针孔
Abstract: The structure of thick pinhole with double cones is studied and designed for the spot size measurement of the high-energy intense-current linear induction accelerator (LIA) light source. The theoretical model for numerical calculations is built up according to the parameters of the light source and the practical layout of the experimental measurement. The imaging process of photons penetrating through the thick pinhole structure is simulated, and the impact of the spot size, distribution and off axis on the source spot measurement is analyzed. Calculated results show that the spatial resolution on the source plane reaches 5 lp/mm.
- linear induction accelerator /
- X-ray spot /
- thick pinhole

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图 1 双锥厚针孔结构与成像模型

Figure 1. Structure and imaging model of thick pinhole with double cones

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图 2 光源空间分布理论模型

Figure 2. Models of spatial distributions of the light source

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图 3 电子束打靶的轫致辐射能谱

Figure 3. Energy spectra of bremsstrahlung radiation for the electron beam striking a target

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图 4 点光源条件下的双锥厚针孔成像

Figure 4. Imaging of thick pinhole with double cones by point light source

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图 5 不同条件下厚针孔成像的有效孔径

Figure 5. Effective diameters for the pinhole imaging under different conditions

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图 6 光源偏心对分布测量影响

Figure 6. Effect of light source eccentric distance on the measurement of the source distribution

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图 7 厚针孔成像的空间分辨率曲线

Figure 7. Curves of spatial resolutions for thick pinhole imaging

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表 1 双锥厚针孔成像的焦斑FWHM计算结果

Table 1. Results of source FWHM by thick pinhole imaging

distribution	source FWHM / mm	L₂=1 m		L₂=2 m		L₂=3 m
distribution	source FWHM / mm	δ_{FWHM_cal}/mm	Δ	δ_{FWHM_cal}/mm	Δ	δ_{FWHM_cal}/mm	Δ
KV	1.00	0.94	-6.5%	0.96	-3.6%	0.97	-3.1%
	1.10	1.04	-5.6%	1.06	-3.2%	1.07	-2.7%
	1.30	1.24	-4.4%	1.27	-2.6%	1.27	-2.3%
	1.50	1.45	-3.6%	1.47	-2.2%	1.47	-2.0%
GS	1.00	1.06	5.6%	1.01	0.7%	1.00	0.2%
	1.10	1.15	4.2%	1.10	0.0%	1.09	-0.5%
	1.30	1.33	1.9%	1.28	-1.2%	1.28	-1.7%
	1.50	1.51	0.4%	1.47	-2.0%	1.46	-2.5%
BNT	1.00	1.10	10.2%	1.03	2.7%	1.02	1.8%
	1.10	1.19	7.8%	1.12	2.0%	1.11	0.7%
	1.30	1.36	4.3%	1.30	-0.2%	1.29	-0.8%
	1.50	1.53	2.0%	1.48	-1.4%	1.46	-3.0%
QBNT	1.00	1.12	11.7%	1.03	3.2%	1.02	2.5%
	1.10	1.20	9.2%	1.13	2.4%	1.11	1.2%
	1.30	1.37	5.5%	1.30	-0.1%	1.30	-0.2%
	1.50	1.54	2.8%	1.49	-1.0%	1.47	-1.9%

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参考文献(10)

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