• Open Access

High-extraction-efficiency operation of a midinfrared free electron laser enabled by dynamic cavity desynchronization

Heishun Zen, Hideaki Ohgaki, and Ryoichi Hajima
Phys. Rev. Accel. Beams 23, 070701 – Published 6 July 2020

Abstract

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.

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  • Received 13 April 2020
  • Accepted 17 June 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.070701

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Accelerators & Beams

Authors & Affiliations

Heishun Zen* and Hideaki Ohgaki

  • Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 6110011 Japan

Ryoichi Hajima

  • National Institutes for Quantum and Radiological Science and Technology, Tokai, Naka, Ibaraki 3191106 Japan

  • *zen@iae.kyoto-u.ac.jp

Article Text

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Issue

Vol. 23, Iss. 7 — July 2020

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