Parc Yong Woon, Kim Changbum, Huang Jung Yun, Ko In Soo
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
J Synchrotron Radiat. 2009 Sep;16(Pt 5):642-6. doi: 10.1107/S0909049509024649. Epub 2009 Jul 2.
The coherency of the synchrotron radiation at Pohang Accelerator Laboratory has been investigated using Young's interferometer. The electron beam size can be measured precisely using the interferometer. An interferogram using 650 nm light at the diagnostics beamline at Pohang Light Source (PLS) has been measured to determine the electron beam distribution and the spatial coherence length. Interferograms obtained by numerical study are compared with experimental results in order to understand the measured data. From this comparison, the electron beam at PLS is revealed to be a Gaussian distribution with a standard deviation of 210 microm. The spatial coherency length of 650 nm light at PLS is measured to be 0.57 cm, and that of 0.1 nm light at PLS is predicted to be 0.88 microm by the same numerical study.
利用杨氏干涉仪对浦项加速器实验室同步辐射的相干性进行了研究。使用该干涉仪可以精确测量电子束尺寸。在浦项光源（PLS）的诊断光束线上，已测量了使用650nm光的干涉图，以确定电子束分布和空间相干长度。通过数值研究获得的干涉图与实验结果进行比较，以便理解测量数据。通过这种比较，发现PLS处的电子束呈高斯分布，标准偏差为210微米。通过相同的数值研究，测得PLS处650nm光的空间相干长度为0.57cm，预测PLS处0.1nm光的空间相干长度为0.88微米。
