@article{oai:repo.qst.go.jp:00080163,
 author = {全炳俊 and 大垣英明 and Hajima, Ryoichi and Ryoichi, Hajima},
 issue = {7},
 journal = {Physical Review Accelerators and Beams},
 month = {Jun},
 note = {The extraction efficiency is one of the key parameters of an oscillator-type free electron laser (FEL). An extraction efficiency higher than 5% was observed with the midinfrared (MIR) FEL at Kyoto University using a dynamic cavity desynchronization method . The observed efficiency is the highest extraction efficiency realized in MIR-FEL oscillators driven by normal conducting linacs. A numerical simulation was performed, and the evolution of the electron energy distribution in the macropulse was compared with the experimental result. The details of the evolution of the electron energy distribution were investigated to reveal the physics of this high-efficiency lasing.},
 title = {High-Extraction-Efficiency Operation of a Midinfrared Free Electron Laser Enabled by Dynamic Cavity Desynchronization},
 volume = {23},
 year = {2020}
}