Superradiance in a Short-Pulse Free-Electron-Laser Oscillator

D. A. Jaroszynski, P. Chaix, N. Piovella, D. Oepts, G. M. H. Knippels, A. F. G. van der Meer, and H. H. Weits
Phys. Rev. Lett. 78, 1699 – Published 3 March 1997
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Abstract

We demonstrate that superradiance (SR) is a general feature of free-electron-laser (FEL) devices, incuding high gain amplifiers as well as low gain oscillators, and that SR pulses and spiking, due to synchrotron instabilities, have the same origin. In particular, we present a direct observation of SR from an FEL oscillator. The ultrashort SR pulses are characterized by a peak intensity and pulse duration which depend, respectively, on the square and the inverse square root of the electron current. The spectral brightness, B, defined as the ratio between the efficiency and the relative rms spectral width, is constant and equal to 0.86.

  • Received 26 August 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.1699

©1997 American Physical Society

Authors & Affiliations

D. A. Jaroszynski

  • Department of Physics and Applied Physics, The University of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow, G4 0NG, United Kingdom

P. Chaix

  • Commissariat à l'Énergie Atomique, BP12, 916680, Bruyères-le-Châtel, France

N. Piovella

  • Dipartimento di Fisica dell' Università, Via Celoria 16, 20133 Milano, Italy

D. Oepts, G. M. H. Knippels, A. F. G. van der Meer, and H. H. Weits

  • FOM-Instituut voor Plasmafysica “Rijnhuizen,” Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands

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Vol. 78, Iss. 9 — 3 March 1997

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