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Undulator superradiance of short electron bunches in a confocal resonating cavity

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Abstract

An undulator-based superradiant oscillator as a source of intense terahertz pulses is investigated in an open resonating cavity. A confocal configuration for the optical cavity is found to be favorable for electron-radiation coupling. Constructive accumulation of superradiance over successive bunches of electrons is achieved if the bunch period is an even multiple of the round-trip time of the radiation pulse. Numerical simulations show that the bunch slippage relative to the radiation pulse determines the pulse width and the corresponding bandwidth. Automatic bunch-pulse positioning with which energy extraction is optimized is also observed, as was first observed in a closed-cavity environment.

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Authors and Affiliations

  1. Department of Electrophysics, Kwangwoon University, Seoul, 01897, Korea

    Y. H. Seo

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  1. Y. H. Seo
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Correspondence to Y. H. Seo.

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Seo, Y.H. Undulator superradiance of short electron bunches in a confocal resonating cavity. Journal of the Korean Physical Society 69, 739–744 (2016). https://doi.org/10.3938/jkps.69.739

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  • DOI: https://doi.org/10.3938/jkps.69.739

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