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

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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)113-118
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume483
Issue number1-2
DOIs
Publication statusPublished - 2002 May 1

Keywords

  • FEL
  • Superradiance
  • Ultrashort pulse

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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