Phase error reduction in ILSF undulators using a genetic algorithm for sorting the magnetic blocks

IF 1.8 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2026-06-01 Epub Date: 2026-03-02 DOI:10.1016/j.apradiso.2026.112534

Karam Mohammadpour , Farhad Saeidi , Mansour Hadad , Naser Vosoughi

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引用次数: 0

Abstract

The insertion device for the Iranian light source facility (ILSF), a 3 GeV third-generation light source, is in the design and construction phase. Insertion devices incorporate up to several thousand magnetic blocks to generate a sinusoidal magnetic field. The primary sources of limitations in the spectral flux and brilliance are the different remanence magnetizations for each magnet block, which are unavoidable. The magnetic field error affects the phase radiation and path of the electron, as well as other issues. The phase error directly affects the relative intensity of the radiation; thus, the intensity decreases with an increase in the phase error. These magnets must be measured and appropriately sorted to minimize phase errors. This study used genetic algorithms on an ILSF's pure permanent magnet undulator as a sorting technique to minimize phase error. The genetic algorithm was implemented using the Wolfram programming language. The optimal magnetic sorting achieved through a genetic algorithm reduces the phase error to 8.78°, which is an 82.9% decrease compared to a random magnetic block setup (51.41°). As a result, the relative intensity increases to 0.98, representing a 104% rise over the random arrangement (0.48), and the electron beam deviation from the undulator axis drops by 90%, from 81.66 μm to 7.93 μm.

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利用遗传算法对磁块进行分类，降低ILSF波动器的相位误差。

伊朗光源设施（ILSF）的插入装置是一个3 GeV第三代光源，目前正处于设计和建造阶段。插入装置包含多达数千个磁块以产生正弦磁场。限制光谱通量和亮度的主要原因是每个磁块的剩余磁化强度不同，这是不可避免的。磁场误差影响电子的相位辐射和路径等问题。相位误差直接影响辐射的相对强度；因此，强度随相位误差的增大而减小。这些磁铁必须测量和适当分类，以尽量减少相位误差。本研究采用遗传算法对ILSF的纯永磁体波动器进行排序，以减小相位误差。遗传算法采用Wolfram编程语言实现。通过遗传算法实现的最优磁分选将相位误差降低到8.78°，与随机磁块设置（51.41°）相比降低了82.9%。结果表明，相对强度增加到0.98，比随机排列（0.48）提高了104%，电子束与波动轴的偏差从81.66 μm减小到7.93 μm，减小了90%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.