High-efficiency broadband THz emission via diffraction-radiation cavity
Abstract
Accelerator-based terahertz (THz) radiation has been expected to realize a high-power broadband source. Employing a low-emittance and short-bunch electron beam at a high repetition rate, a scheme of coherent diffraction-radiation in an optical cavity layout is proposed. The scheme's stimulated radiation process between bunches can greatly enhance the efficiency of the radiation emission. We performed an experiment with a superconducting linac constructed as an energy recovery linac (ERL) test facility. The electron beam passes through small holes in the cavity mirrors without being destroyed. A sharp THz resonance signal, which indicates broadband stimulated radiation correlated with beam deceleration, was observed while scanning the round-trip length of the cavity. This observation proves the efficient beam-to-radiation energy conversion due to the stimulated radiation process.
Cite
@article{arxiv.1902.07510,
title = {High-efficiency broadband THz emission via diffraction-radiation cavity},
author = {Yosuke Honda and Miho Shimada and Alexander Aryshev and Ryukou Kato and Tsukasa Miyajima and Takashi Obina and Ryota Takai and Takashi Uchiyama and Naoto Yamamoto},
journal= {arXiv preprint arXiv:1902.07510},
year = {2019}
}
Comments
13 pages , 20 figures