Consideration on terahertz FEL using pre-bunched electrons shorter than the wavelength

Hiroyuki Hama, Mafuyu Yasuda

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)

Abstract

Interaction between optical field and electron pulse, whose bunch length is much shorter than a wavelength (pre-bunched beam), has been studied by developing a simulation code based on 1-D FEL equations for oscillator configuration. Since coherent spontaneous (CSR) radiation dominates in early stage of the oscillation, we have not applied shot-noise electron population in an optical potential. Start-up of lasing is very much faster because of CSR, and the FEL interaction at head of the optical pulse becomes significant, so that the pulse width gets shorter. It is just the contrary of lethargy effect occurred at zero-detuning with the long electron pulse. In addition saturation mechanism seems to be different from that with the long electron pulse and saturated peak power is very much higher than that of conventional FELs. As a whole the FEL with pre-bunched beam is very much attractive for future light source particularly in terahertz (THz) wavelength region because of unique properties of the optical pulse evolution.

Original languageEnglish
Pages394-397
Number of pages4
Publication statusPublished - 2009
Event31st International Free Electron Laser Conference, FEL 2009 - Liverpool, United Kingdom
Duration: 2009 Aug 232009 Aug 28

Other

Other31st International Free Electron Laser Conference, FEL 2009
CountryUnited Kingdom
CityLiverpool
Period09/8/2309/8/28

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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