Qiao S, Ma Dewei, Feng Donglai, Marks S, Schlueter R, Prestemon S, Hussain Z
Department of Physics, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China.
Rev Sci Instrum. 2009 Aug;80(8):085108. doi: 10.1063/1.3204452.
Heat load on beamline optics is a serious obstacle for devices designed to generate pure linearly polarized photons in third generation synchrotron radiation facilities. For permanent magnet undulators, this problem can be overcome by implementing a figure-eight design configuration. As yet there has been no good method to tackle this problem for electromagnetic elliptical undulators. Here, a novel design and operational mode is suggested, which can generate pure linearly polarized photons with very low on-axis heat load. Additionally, the minimum photon energy capability of linearly polarized photons can be significantly extended by this method.
对于旨在在第三代同步辐射设施中产生纯线偏振光子的设备而言，光束线光学元件上的热负荷是一个严重障碍。对于永磁波荡器，可通过采用八字形设计构型来克服这一问题。然而，对于电磁椭圆波荡器，尚未有解决该问题的好方法。在此，提出了一种新颖的设计和运行模式，其能够以非常低的轴上热负荷产生纯线偏振光子。此外，通过这种方法可显著扩展线偏振光子的最小光子能量能力。
