Phase analysis and focusing of synchrotron radiation
Phase analysis and focusing of synchrotron radiation
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DOI：
10.1016/s0168-9002(99)00581-1
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发表时间：
1999-10-11
影响因子：
1.4
通讯作者：
Snigirev, A
中科院分区：
文献类型：
--
作者：
Chubar, O;Elleaume, P;Snigirev, A
对相对论性电子发射的同步辐射的高精度计算表明，同步辐射的频域电场相位与虚点源的辐射相位不同。如果使用针对点光源进行优化的传统光学元件进行聚焦，这些差异可能会导致衍射受限SR聚焦效率的降低。我们表明，通过局部施加相位校正，可以将SR电场在所需极化处的相位转换为点源的相位。计算了波动辐射（平面和螺旋）和弯曲磁铁辐射（中心部分和边缘）的修正。与未校正的聚焦相比，校正后的SR波前聚焦可使聚焦点的峰值强度增加数倍。对于无衍射限制的辐射，相位修正的影响减小。由于这个原因，在现有的电子存储环中使用所提出的相位修正在光子能量范围从红外到VUV的本质上是感兴趣的。文中讨论的所有数值计算都是通过计算机代码SRW进行的。(C) 1999 Elsevier Science B.V.版权所有
High accuracy calculations of synchrotron radiation (SR) emitted by a relativistic electron show that the phase of the frequency domain electric field of SR differs from the phase of radiation of a virtual point source. These differences may result in the reduction of focusing efficiency of diffraction-limited SR, if the focusing is performed by conventional optical components optimised for point sources. We show that by applying a phase correction locally, one may transform the phase of SR electric field at a desired polarisation to that of a point source. Such corrections are computed for undulator radiation (planar and helical) and bending magnet radiation (central part and edges). The focusing of the corrected SR wavefront can result in the increase of peak intensity in the focused spot up to several times compared to the focusing without correction. For non-diffraction-limited radiation, the effect of the phase corrections is reduced. Due to this reason, the use of the proposed phase corrections in existing electron storage rings is essentially of interest in the photon energy range from infrared to VUV. All numerical calculations discussed in the paper were performed by means of the computer code SRW. (C) 1999 Elsevier Science B.V. All rights reserved.