升级的合肥光源闭轨测量系统及其应用

 描述了合肥同步辐射光源二期工程中，电子储存环升级的闭轨测量系统及其在设备研制中的应用。介绍了性能稳定可靠的Bergoz束流位置监测电子学信号处理器。升级后的闭轨测量系统中处理电子学电路的束流位置分辨率可达1μm，系统误差小于10μm。整个测试系统的分辨率小于3μm。利用该高精度闭轨测量系统和基于束流准直系统完成了束流准直四极铁磁中心的测量，并和控制系统完成了储存环全环闭轨反馈校正试验。一个完整的束流位置监测系统已投入了在线运行，保障了为用户提供高稳定高品质的光源。     

合肥光源储存环注入凸轨系统满能量注入可行性研究

 合肥同步辐射光源现有的注入系统采用1/4能量注入。二期工程改造后,注入系统采用集中布局方案。以改造后的机器为基础,针对合肥同步辐射光源的两组运行模式,探讨实现满能量注入的可行性和实施方案。     

合肥光源电子储存环束流闭轨的局部校正

 在合肥同步辐射装置运行过程中,发生储存环的束流轨道偏移。利用现有设备对束流闭轨的位置进行了多次测量和分析,利用测量数据计算得到校正铁强度与束流位置之间移动的响应矩阵。并利用最小二乘法计算得到三个校正铁的凸轨系数,用于束流闭轨的局部凸轨校正,取得了预期的效果。     

合肥光源电子储存环束流闭轨的局部校正

在合肥同步辐射装置运行过程中，发生储存环的束流轨道偏移。利用现有设备对束流闭轨的位置进行了多次测量和分析，利用测量数据计算得到校正铁强度与束流位置之间移动的响应矩阵，并利用最小二乘法计算得到三个校正铁凸轨系数，用于束流闭轨的局部凸轨校正，取得了预期的效果。     

台肥储存环高频系统的调整

讨论了合肥光源高频系统参数对束流流强的影响。在合肥储存环闭轨校正实验中，发现束流轨道有较大的变化，为此对高频系统的频率、腔温等参数进行了必要的调整。此项工作对二期工程高频系统改造也具有指导意义。     

同步辐射光源的尺寸、散射角和中心亮度计算

 同步辐射光源的尺寸、散角和中心亮度是装置的重要参数。着重讨论了同步光源的尺寸、散角和中心亮度的计算方法, 并给出了合肥同步辐射光源的结果。     

合肥光源上采用干涉方法测量束流截面

 束流截面尺寸测量对优化系统参数、确保光源运行至关重要。采用干涉法测量合肥同步辐射光源束流截面垂直方向的尺寸。基于Cittert-Zernike 定理,利用双缝干涉条纹的对比度得出相干度和束流截面尺寸。测量系统由干涉成像与图像处理系统组成。进行了5组试验,试验结果证明了干涉法测量合肥同步辐射束流截面尺寸的可行性。     

合肥光源束流闭轨局部调整和校正

 针对特定实验站调整光源点位置的要求,设计了合肥光源储存环束流闭轨局部调整和校正系统,介绍了该系统的工作原理、硬件组成、软件设计及运行结果,设计要求束流闭轨局部调整的最大幅度为1~2 mm,水平方向和垂直方向其余闭轨畸变均方根分别小于50和30 μm。校正系统采用轨道设定法作为束流闭轨局部调整和校正算法,由束流轨道测量系统、校正铁系统和控制系统组成。运行结果显示：水平和垂直方向分别调节2.0和1.5 mm,水平方向和垂直方向其余闭轨畸变均方根分别为45.14和27.62 μm。     

合肥光源慢加速过程中高频系统的调节

 合肥光源是一台专用同步辐射光源，它在低能注入积累束流，然后同步地把束流加速到高能并在储存环中稳定运行。在加速过程中，粒子的同步辐射能量损失迅速增加，束流负载效应发生变化，需要相应地调节高频系统参数保持束流稳定。讨论了合肥光源加速过程中高频系统可能的两种高频系统调节方式以及高能情况下高频系统的最佳运行状态。     

合肥光源

正1984年11月20日,合肥光源奠基典礼隆重举行,标志着我国第一个专用同步辐射光源正式开工建设。合肥光源建设、运行逾三十五年,为我国同步辐射光源技术及其应用的发展做出了重要贡献,同时也从一个侧面反映了世界科技前沿的进展以及我国综合国力的巨大进步。一、同步辐射同步辐射(Synchrotron Radiation)是以接近光速运动的电子在磁场中偏转时沿运动轨道切线方向发出的电磁辐射。同步辐射的发现与高能加速器的发     

Coherent pulse propagation through resonant media

Hyperfine Interactions - Resonant pulse propagation (RPP) is reviewed with special emphasis on the propagation of synchrotron radiation (SR) pulses through nuclear single-resonance media. The most...     

利用直流辅助凸轨设计HLS注入系统研究

合肥同步光源的现有注入凸轨由3块冲击磁铁产生,不同的运行模式具有不同的凸轨.为了改变这种凸轨参数与储存环参数的相互依赖,提出采用集中布局的方案,即在注入长直线节形成注入局部凸轨.由于HLS的注入长直线节很短,需要冲击磁铁为束流提供较大的偏转角度.为此,本文研究了采用辅助直流凸轨的方案,以减小对冲击磁铁强度的要求,并分析该注入系统对储存环动力学孔径的改善.     

The study of orbital ordering with resonant x‐ray scattering

Japan has nearly 50 years of history in synchrotron radiation (SR) research and has realized the importance of synchrotron radiation in science advancement since the very beginning. As a result, many SR facilities have been constructed. Today, there are eight SR facilities in operation and three facilities under construction in Japan. Figure 1 shows the location of these facilities with their opening years. Japan has built the world's largest storage ring with circumference of 1.4 km (SPring-8) and the world's smallest ring with circumference of 3 m (Ritsumeikan SRC).     

News and Views: Two Years of the Website lightsources.org

The “Helmholtz-Zentrum für Materialien und Energie,” HZB, in Berlin looks back on a long and successful history in the development and operation of storage ring (SR)-based synchrotron radiation sources, starting in the early 1980s with BESSY I, followed by BESSY II in the late 1990s and the Metrology Light Source set up for the PTB (Physikalisch-Technische Bundesanstalt) in 2008. Novel concepts to better tailor the radiation properties of storage rings to the user's demands (e.g., for short pulses such as low alpha optics and femto-slicing facility) have been pioneered or improved at the HZB. Despite these efforts and the recent progress made in the development towards diffraction-limited SR, it seems right to look into alternative accelerator technologies providing high average current and short-pulsed (sub-ps) beams of exceptional brilliance and low energy spread without the fundamental restrictions of a beam circulating in an equilibrium state of the phase-space distribution.     

A model describing stable coherent synchrotron radiation in storage rings

We present a model describing high power stable broadband coherent synchrotron radiation (CSR) in the terahertz frequency region in an electron storage ring. The model includes distortion of bunch shape from the synchrotron radiation (SR), which enhances higher frequency coherent emission, and limits to stable emission due to an instability excited by the SR wakefield. It gives a quantitative explanation of several features of the recent observations of CSR at the BESSY II storage ring. We also use this model to optimize the performance of a source for stable CSR emission.     

Study on the characteristics of linac based THz light source

There are many methods based on linac for THz radiation production.As one of the options for the Beijing Advanced Light, an ERL test facility is proposed for THz radiation.In this test facility, there are 4 kinds of methods to produce THz radiation: coherent synchrotron radiation (CSR), synchrotron radiation (SR), low gain FEL oscillator, and high gain SASE FEL.In this paper, we study the characteristics of the 4 kinds of THz light sources.     

Growing Partnership Asia-Oceania: Initiative by AOFSRR

No matter the location, it is particularly important to achieve sustainable and efficient access to a synchrotron radiation (SR) facility in order for there to be rapid progress in science and technology. Asia-Oceania is now a vibrant and thriving area in terms of making feasible a broad expansion of access to SR facility services and laying the foundation for more competitive industrial science and future economic growth to which SR science can contribute. Recently, SR facilities have started to pop up, one after another, in the Asia-Oceania region. To enhance global cooperation for SR research in this region, the AOFSRR (Asia-Oceania Forum for Synchrotron Radiation Research) was established by Australia, China, South Korea, Singapore, Taiwan, Thailand, and Japan in 2006. The objective of the AOFSRR is to organize a general framework of collaboration for the development of science and technology of mutual benefit to advancing the research goals and promoting comprehensive cooperation in synchrotron radiation research in the Asia-Oceania region.     

Electromagnetic and gravitational synchrotron radiation

A brief survey of the theory of synchrotron radiation (SR) is presented, with particular attention to quantum effects in the SR spectrum. The inaccuracy of the recent paper by Latal and Erber, considering quantum corrections to the classical SR spectrum, is pointed out. Some mechanisms of generation of gravitational radiation arealso discussed: gravitational SR, creation of gravitons in annihilation processes, and plasma generation of gravitational waves.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 46–53, February, 1980.     

How it All Started at DESY in 1964

To put it bluntly, synchrotrons and storage rings were originally not intended to become light sources for synchrotron radiation (SR). If particle physicists had not driven this development for their own needs, we would not yet have these sources available at their present level of sophistication. In 1964, when the then-6 GeV synchrotron DESY at the newly founded Hamburg institution of the same name started operating, SR was considered at best a nuisance. Accelerating an electron to 6 GeV was accompanied by a loss of 9.35 GeV on its way due to this radiation, and later, at 7.5 GeV, the loss amounted to 22.8 GeV. How could it then happen that today all of the DESY storage rings and linear accelerators are devoted to SR?