An optical resonator with insertable scraper output coupler for the JAERI far-infrared free-electron laser

R. Nagai, R. Hajima, N. Nishimori, M. Sawamura, N. Kikuzawa, T. Shizuma, E. Minehara

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

The performance of an optical resonator featuring an insertable scraper output coupler was evaluated for the JAERI far-infrared free-electron laser. An efficiency factor of the resonator was introduced for evaluation. The efficiency factor was derived from the amount of the output coupling and diffractive loss of the optical resonator, which were calculated by using an optical mode calculation code, using the iterative computation called Fox-Li procedure. As a result of the evaluation, it was found that the insertable scraper coupler was the most suitable for the far-infrared free-electron lasers. Dependencies of insertion direction and scraper radius were also investigated to find out the optimum geometry of the insertable scraper coupler. It was found that the optimum direction of the scraper was parallel to the wiggling plane of the electron beam and the efficiency of the optical resonator increased with the enlargement of the scraper radius.

Original languageEnglish
Pages (from-to)519-523
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume475
Issue number1-3
DOIs
Publication statusPublished - 2001 Nov 21
Event22nd International Free Electron Laser Conference (FEL 2000) - Durham, NC, United States
Duration: 2000 Aug 132000 Aug 18

Keywords

  • Efficiency
  • Far-infrared
  • Free-electron laser
  • Optical resonater

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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