Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings
Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings
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DOI：
10.1380/ejssnt.2019.41
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发表时间：
2019-04-27
影响因子：
0.7
通讯作者：
Tanaka, Takashi
中科院分区：
文献类型：
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作者：
Matsuda, Iwao;Yamamoto, Susumu;Tanaka, Takashi
我们设计了一个分段波荡器组成的四个单元的APPLE波荡器，如APPLE-II，和三个移相器。通过模拟同步辐射的1-nm-rad发射度环中的光学性能，新型波荡器产生各种偏振光，这些偏振光具有高通量、高偏振和快速切换，对存储环中的电子束具有边际扰动。波荡器段中的各种偏振组合允许进行新颖的研究，例如使用X射线光子中的轨道角动量的实验。此外，它们为线性和圆偏振提供高通量的第三谐波光束，从而在光束线处显著地扩展光子能量范围。分段波荡器的偏振控制的高自由度为低发射率同步辐射或X射线自由电子激光器的新实验提供了机会。
We designed a segmented undulator composed of four units of an APPLE undulator, such as an APPLE-II, and three phase-shifters. By simulating the optical performance in a 1-nm-rad emittance ring of synchrotron radiation, the novel undulator generates various polarized light that have high flux, high polarization, and fast-switching with a marginal perturbation to an electron beam in the storage ring. Varieties of polarization combinations in undulator segments allow for novel research, such as experiments using orbital angular momentum in X-ray photons. Furthermore, they provide a high flux third harmonic beam for both linear and circular polarizations, extending the photon energy range significantly at a beamline. The high degree of freedom in polarization controls of the segmented undulator provides opportunities for new experiments with low-emittance synchrotron radiation or X-ray free electron lasers.