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Improved nonlinear optimization in the storage ring of the modern synchrotron radiation light source 总被引:1,自引:0,他引:1
In the storage ring of the third generation light sources, nonlinear optimization is an indispensable course in order to obtain ample dynamic acceptances and to reach high injection efficiency and long beam lifetime, especially in a low emittance lattice. An improved optimization algorithm based on the single resonance approach, which takes relative weight and initial Harmonic Sextupole Integral Strength (HSIS) as search variables, is discussed in this paper. Applications of the improved method in several test lattices are presented. Detailed analysis of the storage ring of the Shanghai Synchrotron Radiation Facility (SSRF) is particularly emphasized. Furthermore, cancellation of the driving terms is investigated to reveal the physical mechanism of the harmonic sextupole compensation. Sensitivity to the weight and the initial HSIS as well as dependence of the optimum solution on the convergent factor is analyzed. 相似文献
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本文从场的对称特性来解析整腔结束的单周期和双周期谐振腔链的振荡模式,并给出它们的场分布,作为对用等效电路理论研究谐振腔链的振荡模式和场分布的另一校核方法.其中整腔结束的单周期谐振腔链的振荡模式、色散关系以及它们的场分布,经高能所600兆赫模型腔链实验证明结论正确。 相似文献
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李政道先生在阔别26 年后的1972 年9 月,携夫人重返祖国大陆,受到周总理的亲切接见。1974 年5 月李先生第二次回国,受到毛主席的亲切接见。 相似文献
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Design study of a L-band DC photocathode gun 总被引:1,自引:1,他引:0
In this paper, we the design study of a L-band DC photocathode gun injector for the ERL (Energy Recovery Linac) test facility. The main parameters of the injector are energy of 2.3 MeV, a bunch length of 2 ps, and a normalized emittance of 2.1 mm.mrad. 相似文献
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Design study on the merger for BXERL-FEL 总被引:1,自引:1,他引:0
In North China, there is a preliminary proposal for ERL-FEL light source (BXERL-FEL) with its aim at "one machine, two purposes" (the XFEL and ERL work simultaneously). One of the key technologies is the merger section. In this paper, we give the physical design of the merger section for BXERL-FEL which merges three kinds of electron beam. 相似文献
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总结了国内外在衍射极限储存环(DLSR)物理设计方面的研究进展。为了在合理的周长范围内实现超低束流发射度,DLSR线性束流光学设计普遍采用紧凑型多二极铁消色散结构。在非线性动力学优化中,通常采用相移控制技术、解析和数值优化技术减小由色品六极铁导致的强非线性效应。DLSR束流接受度较小,主要考虑脉冲多极铁偏轴注入和快速冲击磁铁在轴注入两种注入方案。束流集体效应(尤其是束流内部散射和托歇克散射效应)随发射度降低而增强,需要采用束长拉伸、横向反馈等方法提高DLSR中束流的稳定性。 相似文献
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In the proposal of the Beijing Advanced Light Source, a compact combination of XERL and XFEL using a common SC linac is being considered. In the meantime, an ERL-FEL test facility is being proposed and will be used for THz radiation. In this test facility, a L-band photocathode RF injector is needed. In this paper, we give the physical design of the L-band photocathode RF injector for the test facility. 相似文献
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北京X射线自由电子激光试验装置(BTF)将“寄生”在BEPCⅡ直线注入器这一国内能量最高, 性能最好的电子直线加速器上.BTF将弃用现有直流枪予注入器, 采用光注入器(photoinjector)经低能输运线斜注入到BEPCⅡ直线加速器主加速器,
同时拆掉三节加速管以安装两级磁压缩器, 并在A46后拆掉二节加速管引出束流, 经高能输运线后进入波荡器.模拟结果表明改造后的直线加速器BTF电子能量可达1.18GeV、能散0.15%、归一化发射度小于2.5mm.mrad. 相似文献