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Dual-cavity beam arrival time monitor design for the Shanghai soft X-ray FEL facility

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Nuclear Science and Techniques 2019年第5期30卷 14-21页

作者： Shan-Shan Cao ren-xian yuan Jian Chen Yong-Bin Leng Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Free electron lasers provide high-power and ultrashort pulses with extreme brightness. In order to improve a facility's capabilities and explore the possibility of performing high-resolution time-resolved experiments, a beam arrival time resolution under 100 fs is required. In this article, a novel beam arrival time monitor(BAM)equipped with two cavities has been designed and a beam flight time measurement scheme based on the BAM prototype has been proposed to estimate phase jitter in the signal measurement system. The two BAM cavities work at different frequencies and the frequency difference is designed to be 35 MHz. Therefore, a self-mixing intermediate frequency signal can be generated using the two cavities. The measured beam flight time shows a temporal deviation of 37 fs(rms).

关键词： Beam arrival time monitor Dual-cavities Beam flight time Self-mixing

Optimization of the cavity beam-position monitor system for the Shanghai soft X-ray free-electron laser user facility

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Nuclear Science and Techniques 2022年第10期33卷 22-32页

作者： Jian Chen Yong-Bin Leng Lu-Yang Yu Long-Wei Lai ren-xian yuan Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

To achieve high-efficiency operation of the highgain free-electron laser(FEL),the electron beams and radiated photon beams need to be overlapped precisely and pass through the entire undulator ***,a high-resolution beam-position monitor(BPM)is required.A cavity BPM(CBPM)with a resonant cavity structure was developed and used in the Shanghai Soft X-ray FEL(SXFEL)test facility and can achieve a position resolution of<1μ*** construction and operation of the SXFEL user facility also bring about higher requirements for beamposition *** this case,the factors that affect the performance of the CBPM system were further *** included the amplitude and phase stability of the local oscillator,stability of the trigger signal,performance of the radio frequency front-end,signal processing electronics,and signal processing *** on the upgrade and optimization of the system,a beam test platform was built at the end of the linear acceleration section of the SXFEL,and the experimental results show that the position resolution of the system can reach 177 nm at a bunch charge of 500 pC,and the dynamic range is controlled within±300μm,and the relative measurement uncertainty of the bunch charge can reach 0.021%,which are significant improvements compared to the attributes of the previous system.

关键词： Cavity BPM SXFEL System optimization Position resolution Measurement uncertainty Algorithm

Beam test results of high Q CBPM prototype for SXFEL

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Nuclear Science and Techniques 2017年第4期28卷 51-58页

作者： Jian Chen Yong-Bin Leng Lu-Yang Yu Long-Wei Lai ren-xian yuan Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China University of the Chinese Academy of Sciences Beijing 100049 China

In pursuit of high-precision beam position measurements at micrometers or submicrometers for the Shanghai soft X-ray free-electron laser(SXFEL) facility which is under construction in the vicinity of the Shanghai Synchrotron Radiation Facility,a high Q cavity beam position monitor(CBPM) with a resonant frequency of4.7 GHz is developed by the Shanghai Institute of Applied Physics,and the relevant BPM electronics with a dedicated RF front end,and a digital BPM,are *** cavity design,cold test,system architecture,and first beam test are performed at the Shanghai deep ultraviolet free-electron laser(Zhao et *** Nucl Instrum Meth A 528(1-2):591-594,***:10.1016/***.2004.04.108) *** of the beam experiment show that the performance of the CBPM is consistent with basic expectations,and the beam position resolution can fulfill the requirements for the SXFEL project if the beam conditions are optimized.

关键词： High Q CBPM SXFEL Position resolution RF front end DBPM

Study of the crosstalk evaluation for cavity BPM

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Nuclear Science and Techniques 2018年第6期29卷 67-75页

作者： Jian Chen Yong-Bin Leng Lu-Yang Yu Long-Wei Lai ren-xian yuan Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 201204 China University of the Chinese Academy of Science Beijing 100049 China

In order to pursue high-precision beam position measurements for free-electron laser facilities, a cavity beam position monitor(CBPM) is employed to measure the transverse position that can meet the requirement of position resolution at a sub-micrometer or even nanometer scale. However, for the pill-box cavity BPM, crosstalk between the cavities will have an effect on the accurate measurement of beam position. To reduce the effect of crosstalk on CBPM performance and ease the measurement of the isolation between the cavities, the cavities with a slight difference in resonant frequency were designed and applied in the Dalian coherent light source and Shanghai soft X-ray free-electron laser facilities. Furthermore, two methods, the principal component analysis method and the method of harmonic analysis, are proposed in this paper to evaluate the crosstalk. The results demonstrate that the two methods are feasible in evaluating the crosstalk between the cavities.

关键词： BPM 串音评估位置分辨率学习精确测量激光设备主要部件

Development of the bunch-by-bunch beam position acquisition system based on BEEcube

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Nuclear Science and Techniques 2016年第2期27卷 86-91页

作者： Yong Yang Yong-Bin Leng Ying-Bing Yan Wei-Min Zhou ren-xian yuan Zhi-Chu Chen Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China

In this paper, we report the development of a bunch-by-bunch beam position acquisition *** a wideband synthesizer of PLL, the system realizes synchronous clock of bunch signal. Based on the highperformance FPGA hardware DAQ environment, fourchannel raw data of beam signal can be achieved. Test results in the SSRF storage ring show that the system can obtain beam position of single bunch with the resolution of10 lm and multi-bunch instability can be observed.

关键词：采集系统束流位置基础同步时钟数据采集 FPGA 原始数据合成器

SAPT:a synchrotron-based proton therapy facility in Shanghai

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Nuclear Science and Techniques 2023年第10期34卷 36-46页

作者： Man-Zhou Zhang De-Ming Li Li-ren Shen Hai-Rong Zhang Zhi-Ling Chen Han-Wen Du Ming Gu Rui Li De-Kang Liu Yue-Hu Pu Jun-Feng Yu Jian-Feng Chen Chu Chen Chun-Long Guo Hao Guo Ge-Yang Jiang Zhi-Qiang Jiang Lin Jin Wen-Jing Li Xiu-Fang Li Ye Lin Ming Liu Yong-Hao Liu Ya-Juan Liu Ming Lv Qing-Ru Mi Lian-Hua Ouyang Wei-Guo Shi Hang Shu Qi-Sheng Tang Kun Wang Zhi-Shan Wang Jun Wu Xiao-Bing Wu Jia-Qiang Xu Wen-Zhen Xu Chong-xian Yin Cheng Yu ren-xian yuan Qi-Bing yuan Hai-Qun Zhang Miao Zhang Wen-Zhi Zhang Li-Ying Zhao Wei-Min Zhou Shou-xian Fang Xi-Dong Sun Zhen-Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China APACTRON Particle Equipment Co. Ltd.Shanghai 201815China The Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Because of its excellent dose distribution,proton therapy is becoming increasingly popular in the medical application of cancer treatment.A synchrotron-based proton therapy facility was designed and constructed in *** synchrotron,beam delivery system,and other technical systems were commissioned and reached their expected *** a clinical trial of 47 patients was finished,the proton therapy facility obtained a registration certificate from the National Medical Products *** characteristics of the accelerator and treatment systems are described in this article.

关键词： Proton therapy Synchrotron Slow extraction Gantry Beam delivery system

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论集装箱船大型化应当缓行

集装箱化 2004年第8期15卷 27-29页

作者：刘研任现元上海海事大学上海200135 日照港集装箱公司山东日照276826

2003年以来,各项统计数据表明航运业已走出低谷并迅速复苏,继而空前地兴旺起来.从集装箱船市场来看,由于海运量不断增加,运费费率持续快速上扬.全球航运业的繁荣刺激船公司大量投资造船,新船订造市场异常活跃.

关键词：船舶工程集装箱船船舶订单船舶设计船舶质量

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港口物流园区发展的若干问题探讨

集装箱化 2004年第10期15卷 10-12页

作者：顾亚竹任现元上海海事大学上海200135 日照港集装箱公司山东日照276826

物流园区作为物流业发展到一定阶段的产物,在日本、德国等发达国家已经得到了快速发展,在我国物流园区的开发和兴起始于20世纪末21世纪初,2003年达到建设高潮,并一直持续到今年.

关键词：物流园区园区发展港口物流物流业发展物流发展规划若干问题发达国家市政府中国兴起

外源ABA、SA及JA对干旱胁迫及复水下大豆生长的影响

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大豆科学 2016年第6期35卷 958-963页

作者：金毅郑浩宇金喜军张玉先任春元黑龙江八一农垦大学农学院黑龙江大庆163319

以干旱敏感型品种黑农65和抗旱品种抗线9号为供试材料,采用沙培方式结合15%PEG-6000模拟干旱胁迫,研究了叶面喷施ABA、SA、JA对干旱及复水下的大豆生长的影响。结果表明:3种外源激素均可以显著降低干旱胁迫及复水下大豆叶片有害物质MDA... 详细信息

以干旱敏感型品种黑农65和抗旱品种抗线9号为供试材料,采用沙培方式结合15%PEG-6000模拟干旱胁迫,研究了叶面喷施ABA、SA、JA对干旱及复水下的大豆生长的影响。结果表明:3种外源激素均可以显著降低干旱胁迫及复水下大豆叶片有害物质MDA和过氧化氢含量,同时还能提高干旱胁迫过程中保护性物质可溶性糖和可溶性蛋白含量,大体上表现为ABA的作用效果高于SA和JA,从而降低干旱胁迫对大豆机体的损害程度。3种外源激素均减轻了干旱胁迫对大豆株高、叶、茎、根鲜重和干重的抑制作用,其中JA对干旱敏感型品种黑农65株高、器官鲜、干重的促进效果较好,而SA对抗旱品种抗线9号的促进效果好于ABA和JA。3种外源激素均可降低干旱胁迫导致的大豆落花率,其中SA的作用效果好于ABA和SA。总体来看,外源ABA、SA、JA对干旱胁迫下干旱敏感型品种的促进效果较抗旱品种更明显。

关键词：大豆干旱 ABA SA JA 生长