High-efficiency ultrashort pulse generation in a high-gain FEL oscillator near the perfect synchronism

R. Hajima, N. Nishimori, R. Nagai, E. J. Minehara

    研究成果: Article査読

    14 被引用数 (Scopus)

    抄録

    It has been verified experimentally in JAERI-FEL that a high-gain FEL oscillator has the maximum extraction efficiency at the perfect synchronism of optical-cavity length. The simultaneous measurement of FEL efficiency and absolute cavity length has clearly shown that a sharp peak of detuning curve at the perfect synchronism appears in high-gain and low-loss regime and the FEL extraction efficiency exceeds the scaling law of short-bunch FEL oscillators. A numerical analysis indicates that lasing at the perfect synchronism is quasi-stationary superradiance with random fluctuations, which is analogous to a SASE FEL. Second-order autocorrelation measurements show that FEL pulses shorter than four optical cycles are generated successively for a number of round trips at the perfect synchronism, which is consistent with numerical results.

    本文言語English
    ページ(範囲)113-118
    ページ数6
    ジャーナルNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    483
    1-2
    DOI
    出版ステータスPublished - 2002 5月 1

    ASJC Scopus subject areas

    • 核物理学および高エネルギー物理学
    • 器械工学

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