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首先建立上海同步辐射装置波荡器光源(硬X射线微聚焦光束线站)的面光源高斯-谢尔模型(GSM),其次由高斯-谢尔光源模型与广义惠更斯-菲涅耳原理,推导出部分相干光束交叉谱密度函数在自由空间的传输规律,进而讨论了同步辐射光束空间相干性在自由空间的传输规律。最后,提出了等效光源假设理论,并用该理论研究了上海光源硬X射线微聚焦光束线站(BL15U光束线站)超环面镜对同步辐射光束空间相干性的影响。将该理论计算结果与实验结果进行了比较,结果表明理论与实验符合较好,证明等效光源假设理论有效。由于等效光源假设理论只涉及到入射光束与出射光束的发散角,所以可扩展到其他束线光学元件。
Firstly, the Gaussian-Schell model (GSM) of the surface light source of the undulator source (hard X-ray micro-focus beam line station) of Shanghai Synchrotron Radiation Facility was established, followed by the Gaussian-Schell light source model and the generalized Huygens-Fresnel principle, The propagation law of the cross-spectral density function of partially coherent beam in free space is deduced. Then the transmission law of space coherence of the coherent radiation beam in free space is discussed. Finally, the theory of equivalent light source hypothesis is put forward and the effect of the toroidal coherence of the synchrotron radiation beam is studied by using the theory of toroidal X-ray micro-focusing beam station (BL15U beamline station) toroidal mirror. The theoretical calculation results are compared with the experimental results. The results show that the theory and experiment are in good agreement, which proves that the equivalent light source hypothesis theory is effective. Since the theory of equivalent light sources assumes only the divergence angles of the incident beam and the outgoing beam, it can be extended to other beamlined optical elements.