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Superradiant Undulator Radiation of Periodic Intense Electron Bunches in a Cavity

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2 Author(s)
Seo, Y.H. ; Dept. of Electrophys., Kwangwoon Univ., Seoul, South Korea ; Lee, W.H.

Considered is superradiant undulator radiation emitted at grazing resonance by intense electron bunches periodically injected into a resonating cavity. Compared to a single bunch in a long waveguide, cumulative interaction of periodic bunches in a cavity allows much higher saturated efficiency induced by superradiant stimulated emission of radiation. Simulations in the saturation regime show that the self-field of intense bunches tends to reduce the efficiency by obstructing nonlinear bunching. When energy gain is balanced by cavity loss, the emitted radiation finds a steady state in which the radiation pulse persists with no dispersion. At that state, the cavity works as a stable oscillator, supplying periodic bursts of radiation via output coupling.

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Plasma Science, IEEE Transactions on  (Volume:38 ,  Issue: 8 )