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

被引：0
作者：
Norihiro Sei
Takeshi Sakai
Yasushi Hayakawa
Yoske Sumitomo
Kyoko Nogami
Toshinari Tanaka
Ken Hayakawa
机构：
[1] National Institute of Advanced Industrial Science and Technology,Research Institute for Measurement and Analytical Instrumentation
[2] Nihon University,Laboratory for Electron Beam Research and Application
来源：
Scientific Reports | / 11卷
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摘要：
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.
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