高亮度电子束相空间重建技术的实验研究
束团相空间是描述加速器中束流运行状态的重要参数，了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义，利用相空间重建技术能够直观地得到束团二维相空间分布。本文结合计算机断层扫描技术（Computer Tomography,CT）与归一化相空间理论，在理论推导和模拟验证的基础上，分别利用MENT（Maximum Entropy）算法和FBP（Filtered Back Projection）算法在上海x射线自由电子激光装置（ShanghaiSoft X-ray Free Electron Laser facility,SXFEL）专用束测段（B11）对电子束团的横向归一化相空间进行重建...
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| Published in | 核技术 Vol. 41; no. 3; pp. 13 - 19 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国科学院上海应用物理研究所 嘉定园区 上海 201800
10.03.2018
中国科学院大学 北京 100049%中国科学院上海应用物理研究所 嘉定园区 上海 201800 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-3219 |
| DOI | 10.11889/j.0253-3219.2018.hjs.41.030103 |
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| Abstract | 束团相空间是描述加速器中束流运行状态的重要参数，了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义，利用相空间重建技术能够直观地得到束团二维相空间分布。本文结合计算机断层扫描技术（Computer Tomography,CT）与归一化相空间理论，在理论推导和模拟验证的基础上，分别利用MENT（Maximum Entropy）算法和FBP（Filtered Back Projection）算法在上海x射线自由电子激光装置（ShanghaiSoft X-ray Free Electron Laser facility,SXFEL）专用束测段（B11）对电子束团的横向归一化相空间进行重建。通过重建算法变换得到电子束团的真实相空间分布，并对重建结果进行对比和误差分析。实验结果表明，MENT算法能够精确测量电子束团横向相空间分布。 |
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| AbstractList | 束团相空间是描述加速器中束流运行状态的重要参数，了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义，利用相空间重建技术能够直观地得到束团二维相空间分布。本文结合计算机断层扫描技术（Computer Tomography,CT）与归一化相空间理论，在理论推导和模拟验证的基础上，分别利用MENT（Maximum Entropy）算法和FBP（Filtered Back Projection）算法在上海x射线自由电子激光装置（ShanghaiSoft X-ray Free Electron Laser facility,SXFEL）专用束测段（B11）对电子束团的横向归一化相空间进行重建。通过重建算法变换得到电子束团的真实相空间分布，并对重建结果进行对比和误差分析。实验结果表明，MENT算法能够精确测量电子束团横向相空间分布。 TL271; 束团相空间是描述加速器中束流运行状态的重要参数,了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义,利用相空间重建技术能够直观地得到束团二维相空间分布.本文结合计算机断层扫描技术(Computer Tomography, CT)与归一化相空间理论,在理论推导和模拟验证的基础上,分别利用MENT (Maximum Entropy)算法和FBP (Filtered Back Projection)算法在上海X射线自由电子激光装置(Shanghai Soft X-ray Free Electron Laser facility, SXFEL)专用束测段(BI1)对电子束团的横向归一化相空间进行重建.通过重建算法变换得到电子束团的真实相空间分布,并对重建结果进行对比和误差分析.实验结果表明,MENT 算法能够精确测量电子束团横向相空间分布. |
| Abstract_FL | [Background] Phase space is an important parameter to describe the beam transmission, and it is of great importance to measure the phase space distribution experimentally in linear accelerator (LINAC) commissioning. Computer tomography technology has been used in many accelerators to characterize the phase space of an electron beam in recent years. [Purpose] This study aims to measure two-dimensional distribution of phase space by reconstruction technology for high-brightness electron beam. [Methods] Maximum entropy (MENT) algorithm and filtered back projection (FBP) algorithm were combined with computer tomography technology and normalized phase space theory to reconstruct the normalized phase space of the beam. Then transformed the normalized phase space to real phase space with experimental verification at special beam insertion (BI1) of Shanghai Soft X-ray Free Electron Laser facility (SXFEL). [Results] The results from FBP algorithm and MENT algorithm were compared, and the latter showed better performance than the former. The emittance and Twiss parameters calculated by reconstructed phase space were very close to the values obtained by quadrupole scan method. [Conclusion] The experimental results show that computer tomography technology with MENT algorithm can reconstruct the beam phase space exactly. |
| Author | 于清林;张猛;谷端;赵明华 |
| AuthorAffiliation | 中国科学院上海应用物理研究所嘉定园区,上海201800;中国科学院大学,北京100049 |
| AuthorAffiliation_xml | – name: 中国科学院上海应用物理研究所 嘉定园区 上海 201800;中国科学院大学 北京 100049%中国科学院上海应用物理研究所 嘉定园区 上海 201800 |
| Author_FL | ZHAO Minghua GU Duan YU Qinglin ZHANG Meng |
| Author_FL_xml | – sequence: 1 fullname: YU Qinglin – sequence: 2 fullname: ZHANG Meng – sequence: 3 fullname: GU Duan – sequence: 4 fullname: ZHAO Minghua |
| Author_xml | – sequence: 1 fullname: 于清林;张猛;谷端;赵明华 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DocumentTitleAlternate | Experimental study on phase space reconstruction of high-brightness electron beam |
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| Keywords | 上海X射线自由电子激光装置 Normalized phase space 相空间重建 SXFEL Phase space reconstruction 归一化相空间 MENT算法 MENT algorithm |
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| Notes | YU Qinglin1,2 ZHANG Meng1, GU Duan1, ZHAO Minghua1 （1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;2.University of Chinese Academy of Sciences, Beijing 100049, China） Deep penetration;Variance reduction;Monte Carlo;Electron irradiation accelerator [Background] Variance reduction is a common method to resolve the problems in deep penetration application such as radiation shielding, medical physics and well-logging. Currently, the study of the variance reduction techniques is based on simple theoretical geometric model, lacking the discussion on complex practical applications. [Purpose] This paper aims to find an optimized combined variance reduction technique in deep penetration application on the practical complex model. [Methods] With an electron irradiation accelerator as the model, this paper studied the effects of combined variance reduction techniques on MCNP5（Monte Carlo N Particle Transport Code） platform, including geometry splitting, biasing |
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| Publisher | 中国科学院上海应用物理研究所 嘉定园区 上海 201800 中国科学院大学 北京 100049%中国科学院上海应用物理研究所 嘉定园区 上海 201800 |
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| Snippet | 束团相空间是描述加速器中束流运行状态的重要参数，了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义，利用相空间重建技术能够直观地得到束团二维相空间分... TL271; 束团相空间是描述加速器中束流运行状态的重要参数,了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义,利用相空间重建技术能够直观地得到束团二维相... |
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| SubjectTerms | 归一化相空间;相空间重建;MENT算法;上海X射线自由电子激光装置 |
| Title | 高亮度电子束相空间重建技术的实验研究 |
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