相对论电子在光栅中小角度共振极化辐射的研究
Investigation of resonant polarization radiation of relativistic electrons in gratings at small angles
摘要：
在托木斯克同步加速器和6 MeV电子回旋加速器上，研究了Smith-Purcell几何结构下的共振光偏振辐射（ROPR）和倾斜光栅的共振光偏振辐射。在200 MeV电子束的4.2 °和6.2 MeV电子束的5 °处观察到极化辐射。在这两种情况下，使用了两种测量ROPR最大值的方法。在第一种情况下（同步加速器的实验），我们使用滤光片固定了辐射的波长;测量了这种辐射的取向依赖性。在这种依赖关系中，我们观察到两个峰值的辐射电子在金箔光栅的0.1毫米周期。第一个大峰是镜面反射方向的零级峰，第二个大峰是共振偏振辐射的一级峰。在回旋加速器实验中，测量了周期为0.2mm的Smith-Purcell结构铝箔条形光栅的ROPR谱，观察到了一阶Smith-Purcell辐射峰。并将所得数据与模拟结果进行了比较。
英文摘要：
The Resonant Optical Polarization Radiation (ROPR) in the Smith-Purcell geometry and the one from the inclined grating at the Tomsk synchrotron and 6-MeV microtron have been investigated. The polarization radiation was observed at 4.2o from the 200 MeV electron beam and at 5o from the 6.2 MeV electron beam. Two methods of measurement of ROPR maxima in these two cases have been used. In the first case (the experiment on synchrotron) we have fixed the wavelength of radiation using an optical filter; the orientation dependence of this radiation was measured. In this dependence we have observed two peaks of radiation from electrons in gold foil grating of 0.1 mm period. The first large peak is a zeroth order peak in direction of specular reflection, and the second one is the 1-st order peak of resonant polarization radiation. In the experiment on microtron the spectra of ROPR from aluminum foil strip grating of 0.2 mm period in the Smith-Purcell geometry were measured, and the peak of the 1-st order Smith-Purcell radiation in these spectra was observed. The comparison of data obtained with the simulation results has been performed.
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