STUDY OF COHERENT SYNCHROTRON RADIATION AND CHERENKOV RADIATION

来自直线加速器的电子被限制在纵向长度为几毫米的短束团中。本研究利用东北大学原子核科学实验室和京都大学研究堆实验室的直线加速器观测了相干同步辐射。在任何一种情况下观察到的光谱在1至4mm附近的波长处具有峰值，并且与普通辐射的强度相比，强度增强了几个数量级。强度对束流和辐射偏振的依赖关系与理论一致。在研究过程中，我们首次观察到了电子通过薄金属箔时发出的相干跃迁辐射。它的光谱和相干效应引起的强度增强与相干同步辐射相似。研究了强度与发射长度和角分布的关系。 ...更多信息 强度的变化与理论相符。此外，我们已经观察到相干跃迁辐射使用线性加速器在大坂大学。我们测定了束流的直径和发射度，以及束团中电子的纵向分布。相干渡越辐射已被证明是束流诊断的一种有用手段。因此，我们用相干辐射研究了长波区跃迁辐射的性质。相干渡越辐射和同步辐射已被证实是有用的连续谱源。我们指出，在电子轨道有界的切伦科夫辐射的情况下，区分渡越辐射和切伦科夫过程的贡献是很重要的。此外，我们已经通过实验证实，发射长度必须比形成区长，以便发生切伦科夫过程的有效辐射。少

The electrons from a linear accelerator is confined in a short bunch whose longitudinal length is a few millimeters. In our study we have used linear accelerators at laboratory for Nuclear Science, Tohoku University and at Research Reactor Laboratory, Kyoto University to observe coherent synchrotron radiation. The observed spectrum in either case had a peak at a wavelength around 1 to 4 mm and the intensity was enhanced by a factor of several orders of magnitude compared with that of ordinary radiation. The dependence of the intensity on the beam current and the polarization of the radiation were in agreement with theory. During the study, we observed for the first time coherent transition radiation which was emitted when the electrons passed through a thin metallic foil. Its spectrum and the enhancement of the intensity due to the coherent effect ware similar to those of the coherent synchrotron radiation. The dependence of the intensity on the emission length and the angular distribu … More tion of the intensity were in accordance with theory. Further, we have observed coherent transition radiation using a linear accelerator at Osaka University. We have determined the diameter and the emittance of the beam, and the longitudinal distribution of the electrons in a bunch. Coherent transition radiation has been proved to be a useful means of the beam diagnosis. Thus, the properties of transition radiation in the long wavelength region have been studied by the coherent radiation. Coherent transition radiation and synchrotron radiation have been confirmed to be useful sources with continuous spectra.We have pointed out that it is important to distinguish the contribution from the transition radiation from that of the Cherenkov process in the case of the Cherenkov radiation from a bounded trajectory of the electron. Further, we have confirmed experimentally that the emission length must be longer than the formation zone in order that effective radiation of the Cherenkov process occurs. Less