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Analysis of an FEL oscillator at zero detuning length of an optical cavity in the early stage of the field evolution

Nishimori, Nobuyuki

The evolution of the field of an FEL oscillator at zero detuning length of an optical cavity (dL = 0) is studied analytically. The field on the leading edge at the first round trip is the same as that of a self-amplified spontaneous emission (SASE) FEL characterized by an FEL parameter. The field evolves with round trips by interaction with electrons. The field in the early stage of the evolution is found to scale with the FEL parameter and the round-trip number, and is similar to that of SASE with high electron beam density.

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