Measurement of the phase structure of elliptically polarized undulator radiation
Measurement of the phase structure of elliptically polarized undulator radiation
复制标题
椭圆偏振波荡器辐射相位结构的测量
DOI：
10.1088/1367-2630/abb54a
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发表时间：
2020
影响因子：
3.3
通讯作者：
Katoh Masahiro
中科院分区：
文献类型：
--
作者：
Taira Yoshitaka;Fujimoto Masaki;Ri Shien;Hosaka Masahito;Katoh Masahiro
本文从理论和实验上研究了椭圆偏振波荡器辐射的相位结构。解析表达式的发射电磁场的充分推导和辐射的相位结构被发现根据偏振的变化。当极化是圆形时，观察到螺旋结构;然而，当极化从圆形变为椭圆形时，观察到包括几个轨道角动量模式的相位结构。在此，使用双狭缝干涉仪测量波荡器的辐射的相位梯度。采用取样云纹法从观测到的干涉条纹中准确提取出横截面上的相位差。一次和二次谐波的测量相位梯度揭示了类似的变化的计算结果。然而，在圆偏振下，三次谐波表现出的变化小于计算值。这种相位梯度减小是由于相位奇点的分裂，并且归因于波荡器的峰值磁场的波动和从这些磁场的入口和出口发射的辐射。
This study theoretically and experimentally investigates the phase structure of radiation emitted from an elliptically polarized undulator. Analytic expressions for the emitted electromagnetic fields are fully derived and the radiation's phase structure is found to change according to polarization. When the polarization is circular, a helical structure is observed; however, when the polarization changes from circular to elliptical, a phase structure comprising several orbital angular momentum modes is observed. Herein, phase gradients of the undulator's radiation are measured using a double-slit interferometer. A sampling moiré method is used to accurately extract the phase difference on the transverse plane from the observed interference fringe. The measured phase gradients of the first and second harmonics reveal a similar change to the calculated results. However, under circular polarization, the change exhibited by the third harmonic is smaller than the calculated value. This phase gradient reduction is due to the split in phase singularities and is attributed to both the fluctuation in the undulator's peak magnetic fields and the radiation emitted from the entrance and exit of those magnetic fields.
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影响因子：
35
作者：
Wang, Jian;Yang, Jeng-Yuan;Willner, Alan E.
通讯作者：
Willner, Alan E.
影响因子：
2.4
作者：
Ri, S.;Fujigaki, M.;Morimoto, Y.
通讯作者：
Morimoto, Y.
相对论性电子的波荡器辐射
DOI：
10.1016/0167-5087(83)91117-1
发表时间：
1983
期刊：
影响因子：
--
作者：
M. Nikitin;A. Medvedev
通讯作者：
A. Medvedev
来自螺旋波荡器的光学涡旋光束
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
飯塚太郎;永田祐吾;満汐孝治,鞠谷温人;田中文;L. Chiari;長嶋泰之;久野研二（編著）;Masahiro KATOH
通讯作者：
Masahiro KATOH
电子存储环中的边缘辐射
DOI：
10.1007/bf03185543
发表时间：
1998
期刊：
Il Nuovo Cimento D
影响因子：
--
作者：
R. Bosch
通讯作者：
R. Bosch