Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations

Abstract A coupling device, which can extract coherent edge radiation (CER) from an optical cavity for a free-electron laser (FEL) without damaging the FEL due to diffraction loss, was developed at Nihon University. We successfully observed the CER beam with a power of 1 mW or more in the terahertz...

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Autores principales:	Norihiro Sei, Takeshi Sakai, Yasushi Hayakawa, Yoske Sumitomo, Kyoko Nogami, Toshinari Tanaka, Ken Hayakawa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f725251a047140bba03c5cff8bfa8d37
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spelling	oai:doaj.org-article:f725251a047140bba03c5cff8bfa8d372021-12-02T14:26:54ZObservation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations10.1038/s41598-021-82898-72045-2322https://doaj.org/article/f725251a047140bba03c5cff8bfa8d372021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82898-7https://doaj.org/toc/2045-2322Abstract A coupling device, which can extract coherent edge radiation (CER) from an optical cavity for a free-electron laser (FEL) without damaging the FEL due to diffraction loss, was developed at Nihon University. We successfully observed the CER beam with a power of 1 mW or more in the terahertz range during FEL oscillation. It is revealed that the CER power changed with the detuning of the optical cavity and the dependence of the CER power on the detuning length differs from that of the FEL power. The measured CER spectra indicate that the longitudinal electron distribution in a bunch is modulated by the FEL oscillation with a period corresponding to the FEL slippage length. We herein report the characteristics of the CER with FEL oscillation in detail. These results demonstrate that the CER is excellent tool to reveal the overall effect of FEL interaction on electron distribution in a bunch.Norihiro SeiTakeshi SakaiYasushi HayakawaYoske SumitomoKyoko NogamiToshinari TanakaKen HayakawaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Norihiro Sei Takeshi Sakai Yasushi Hayakawa Yoske Sumitomo Kyoko Nogami Toshinari Tanaka Ken Hayakawa Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
description	Abstract A coupling device, which can extract coherent edge radiation (CER) from an optical cavity for a free-electron laser (FEL) without damaging the FEL due to diffraction loss, was developed at Nihon University. We successfully observed the CER beam with a power of 1 mW or more in the terahertz range during FEL oscillation. It is revealed that the CER power changed with the detuning of the optical cavity and the dependence of the CER power on the detuning length differs from that of the FEL power. The measured CER spectra indicate that the longitudinal electron distribution in a bunch is modulated by the FEL oscillation with a period corresponding to the FEL slippage length. We herein report the characteristics of the CER with FEL oscillation in detail. These results demonstrate that the CER is excellent tool to reveal the overall effect of FEL interaction on electron distribution in a bunch.
format	article
author	Norihiro Sei Takeshi Sakai Yasushi Hayakawa Yoske Sumitomo Kyoko Nogami Toshinari Tanaka Ken Hayakawa
author_facet	Norihiro Sei Takeshi Sakai Yasushi Hayakawa Yoske Sumitomo Kyoko Nogami Toshinari Tanaka Ken Hayakawa
author_sort	Norihiro Sei
title	Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
title_short	Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
title_full	Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
title_fullStr	Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
title_full_unstemmed	Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
title_sort	observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f725251a047140bba03c5cff8bfa8d37
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Observation of terahertz coherent edge radiation amplified by infrared free-electron laser oscillations

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