Proposal of coherent Cherenkov radiation matched to circular plane wave for intense terahertz light source

• We proposed a new intense terahertz-wave source based on coherent Cherenkov radiation (CCR).
• A hollow conical dielectric is used to generate the CCR beam.
• The wave front of the CCR beam can be matched to the basal plane.
• The peak-power of the CCR beam is above 1 MW per micropulse with a short interval of 350 ps.

We propose a high-peak-power terahertz-wave source based on an electron accelerator. By passing an electron beam through a hollow conical dielectric with apex facing the incident electron beam, the wave front of coherent Cherenkov radiation generated on the inner surface of the hollow conical dielectric matches the basal plane. Using the electron beam generated at the Laboratory for Electron Beam Research and Application at Nihon University, the calculated power of coherent Cherenkov radiation that matched the circular plane (CCR-MCP) was above 1 MW per micropulse with a short interval of 350 ps, for wavelengths ranging from 0.5 to 5 mm. The electron beam is not lost for generating the CCR-MCP beam by using the hollow conical dielectric. It is possible to combine the CCR-MCP beams with other light sources based on an accelerator.