First demonstration of coherent Cherenkov radiation matched to circular plane wave

Norihiro Sei; Toshiharu Takahashi

doi:10.1038/s41598-017-17822-z

First demonstration of coherent Cherenkov radiation matched to circular plane wave

Sci Rep. 2017 Dec 12;7(1):17440. doi: 10.1038/s41598-017-17822-z.

Authors

Norihiro Sei¹, Toshiharu Takahashi²

Affiliations

¹ Research Institute for Measurement and Analytical Instrumentation, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan. sei.n@aist.go.jp.
² Research Reactor Institute, Kyoto University, 2 Asashiro-nishi, Kumatori, Osaka, 590-0494, Japan.

Abstract

We observed coherent Cherenkov radiation matched to a circular plane wave (CCR-MCP) for the first time using a hollow conical dielectric made of a high-density polyethylene. The refractive index and the absorption coefficient of the dielectric were evaluated to be 1.537 ± 0.004 and 0.006 ± 0.028 by measuring the pulse formed by the interference between the CCR-MCP and the coherent diffraction radiation. These values were consistent with the values shown in a reference for the high-density polyethylene. In accordance with the theory of the Cherenkov radiation, the spectrum of the CCR-MCP shifted towards higher wavenumbers compared to that of the coherent diffraction radiation. The intensity of the CCR-MCP beam was proportional to the height of the hollow conical dielectric and was 3 times the intensity of the coherent diffraction radiation. The CCR-MCP technique can produce broadband terahertz-wave sources with unprecedented power at compact accelerator facilities.

Publication types

Research Support, Non-U.S. Gov't