STUDY OF COHERENT SYNCHROTRON RADIATION AND CHERENKOV RADIATION

相干同步辐射和契伦科夫辐射的研究

基本信息

批准号：
03402010
负责人：
IKEZAWA Mikihiko
金额：
$ 11.01万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

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

来自线性加速器的电子设备被限制在一个短束的纵向长度的短束中。在我们的研究中，我们使用了核科学实验室的线性加速器和京都大学研究反应堆实验室的线性加速器来观察相干的同步辐射。在任何一种情况下，观察到的光谱在1至4 mm左右的波长下的峰值峰值，与普通辐射相比，强度的增强率达到了几个数量级。强度对光束电流的依赖性和辐射的极化与理论一致。在研究期间，我们首次观察到了相干的过渡辐射，这是当电子通过薄金属箔时发出的。它的频谱和由于相干效应塑料与相干同步辐射相似的强度增强。强度对发射长度和角度分布的依赖性……更多的强度符合理论。此外，我们已经使用大阪大学的线性加速器观察到了连贯的过渡辐射。我们已经确定了光束的直径和发射，以及电子中电子的纵向分布。一致的过渡辐射已被证明是光束诊断的有用手段。这是，长波长区域中过渡辐射的特性具有连贯的过渡辐射和同步加速器辐射，已证实是具有连续光谱的有用源。我们指出，在Cherenkov辐射过程中，在Cherenkov辐射过程中，将过渡辐射与Cherenkov过程的贡献与Cherenkov辐射过程区分开是重要的。此外，我们在实验上确认了发射长度必须长于地层区，以便发生Cherenkov过程的有效辐射。较少的