The angular characteristics of millimeter radiation generated by a 6.1-MeV electron beam flying near a multilayer prism target consisting of conducting plates separated by vacuum gaps and near a homogeneous Teflon prism have been studied experimentally. The angular distributions of radiation from both targets have been compared. It has been shown that the angular distribution for the Teflon prism is in good agreement with the classical theory of Cherenkov radiation, whereas the evolution of angular distributions for the multilayer target is inconsistent with known expressions with a fixed effective refractive index. Radiation from the multilayer target (quasi-Cherenkov radiation) should assumingly be described by a tensor refractive index.

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相对论电子在多层棱镜靶附近飞行的辐射的拟切伦科夫机理

实验研究了6.1 MeV电子束在多层棱镜靶附近飞行所产生的毫米波辐射的角特性，该多层棱镜靶由被真空间隙隔开的导电板和均匀的特氟隆棱镜附近形成。比较了来自两个目标的辐射角分布。已经表明，特氟龙棱镜的角分布与切伦科夫辐射的经典理论非常吻合，而多层靶的角分布的演化与有效折射率固定的已知表达式不一致。多层目标的辐射（准切伦科夫辐射）应假定由张量折射率来描述。