共查询到18条相似文献,搜索用时 203 毫秒
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合肥光源由800MeV电子储存环、200MeV直线加速器和束流输运线组成。束流输运线线性光学参数是影响束流传输效率和储存环注入效率的关键因素。在分析合肥光源现束流输运线性能基础上,重新优化设计输运线聚焦结构。新设计在改善输运线与储存环之间Twiss参数和色散函数匹配基础上,更好地控制传输过程中束流包络,并减轻了开关磁铁幅度抖动对传输束流末态位置的影响。通过优化光学参数设计,束流传输效率将明显改善,同时参数匹配将有利于提高储存环注入效率。并且,新设计中的主磁铁磁场强度较低,输运线具备传输800MeV束流的能力。 相似文献
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上海同步辐射光源(SSRF)是一台第3代高性能同步辐射装置,已稳定运行超过10年。储存环的线性光学模型稳定是光源稳定运行的基础。工作点反馈系统可实时地校正工作点,并间接地以降维的方式反馈难以在线测量到的线性光学函数。工作点反馈系统在SSRF的稳定运行验证了此方法的可行性,该反馈系统不仅使得工作点稳定度显著提升,也使得束流发射度、注入效率以及束流寿命等重要参数的稳定度得到大幅提升。衍射极限储存环光源是现阶段被广泛研究和建设的新一代同步辐射光源,工作点反馈系统也将发挥更重要的作用。本文分析电子储存环线性光学函数和工作点的稳定性,回顾SSRF工作点反馈系统的实际运行情况,介绍工作点反馈系统在SSRF衍射极限环lattice(SSRF-U)的模拟。工作点反馈在SSRF的实际运行情况和在SSRF-U的模拟结果显示,该系统可将工作点稳定在±0.001范围内,可满足储存环光源稳定运行和线性差耦合共振圆束斑模式对工作点稳定度的需求。 相似文献
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为适应合肥光源储存环工作点测量的需要,设计了基于Zynq的工作点测量系统。该测量系统由前端电子学、FPGA、ARM和上位机构成,系统结构紧凑,成本较低,功能丰富,可在线编程满足不同机器研究实验的需求。论文论述了参数化白噪声信号和扫频信号的产生以及相应的信号处理过程。在线实验结果表明,工作点在扫频激励模式下,水平和垂直方向的统计分辨率分别为0.0006/0.0001,白噪声激励模式下,水平和垂直方向的统计分辨率分别为0.0007/0.0036。系统进一步改进,还可测量同步振荡阻尼时间、色品等,为合肥光源存储环提供更丰富的束流测量手段。 相似文献
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本文介绍BEPC储存环插入一块高场水平扭摆磁铁情况下一种可能的补偿方法。利用位于扭摆磁铁附近消失差区域中的由独立电源供电的四块四极磁铁,按Twiss参量重新匹配的要求改变其强度,在扭摆磁铁和四块四极磁铁所在区域及其以外区域,均可获得Twiss参量补偿的满意结果。 相似文献
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Beam emittance reduction is an effective method to increase the brightness of a synchrotron light source.Robinson wiggler can play a role in the beam emittance reduction by increasing the horizontal damping partition number.A replacement of the quadrupoles in the arc section with short combined function dipoles will construct a single-periodic Robinson wiggler in the SSRF storage ring.This scheme provides a lower beam emittance,without occupying any straight section.Detailed analysis is presented in this paper. 相似文献
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ZHANG Li-Hua LIAO Yi LIU Gui-Min 《核技术(英文版)》2006,17(1):1-6
Shanghai Synchrotron Radiation Facility (SSP.F), one of the third generation light sources, aims to produce high brightness and/or high flux X-ray source for users; therefore insertion devices (IDs) are important magnetic elements for SSRF. In this paper, the linear perturbations due to IDs toward its storage ring lattice, such as beta function distortions, tune shifts, emittance growths, and energy spreads are estimated by using analytical formulae, and the nonlinear effects from IDs, especially dynamic aperture, are simulated by using Racetrack code. The results show that (a) the reduction of dynamic aperture from single undulator is negligible, since electron beam energy of 3.5 GeV is high and ID's magnetic field is low, and the beta functions in the middle of straight sections, where ID is located, are well optimized; Co) however, the reduction from single wigglers, especially super-conducting wiggler, is visible, because of its higher magnetic field; (c) effects of each ID on emittance growths and energy spreads are less than 7%. 相似文献
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《核技术(英文版)》2018,(12)
The betatron tune is an important parameter in a storage ring to enable stable operation. A tune adjustment tool with a small impact on the beam dynamics is useful for user operation and machine studies. Therefore, a tune knob is developed for the Hefei light source-II(HLS-II) storage ring. Owing to the compactness of the storage ring, a global adjustment mechanism is adopted. To reduce the impact on beam injection, only quadrupole families outside the injection section are used by the tune knob, and the b functions of the injection section remain unchanged. A code is developed based on the accelerator simulation software, MAD-X, to calculate the adjustment of the quadrupole strengths. The accelerator toolbox is used to double check the accuracy of the tune knob. Online measurement of the tune knob is also performed. The result shows that the tune knob works well when the tune is adjusted in a specific range. Betatron coupling measurement is also carried out, showing an application of the tune knob on machine studies. In this paper, the development of the tune knob and its experimental results in the HLS-II storage ring are reported in detail. 相似文献
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Kanaya N. Sakanaka S. Sato S. Koide T. Asaoka S. 《IEEE transactions on nuclear science》1990,37(1):2-6
The finite-element method was used to calculate a rise in temperature at a fast-closing valve (FCV) blade during exposure to intense synchrotron radiation from a 53-pole wiggler at the 2.5-GeV Photon Factory storage ring. The results indicate a possible meltdown of the titanium-alloy blade within 0.1 s at a maximum beam current of 500 mA, making the vacuum protection function of the FCV ineffective for an instantaneous vacuum failure downstream of the wiggler beam line. In order to prevent the blade from melting, the FCV control system has been interlocked with RF klystrons so as to initiate blade closure after dumping the electron beam by turning off the RF power. Performance tests have shown that the system could dump the electron beam within 95 μs and then close the blade within 12.4 ms after being triggered 相似文献