Theory of a Double-Undulator Free-Electron Laser

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DAI Zhi-Min. Theory of a Double-Undulator Free-Electron Laser[J]. Chinese Physics C, 2004, 28(7): 775-780.
DAI Zhi-Min. Theory of a Double-Undulator Free-Electron Laser[J]. Chinese Physics C, 2004, 28(7): 775-780. shu
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Received: 2003-06-26
Revised: 1900-01-01
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Theory of a Double-Undulator Free-Electron Laser

    Corresponding author: DAI Zhi-Min,
  • Shanghai Institute of Applied Physics,CAS, Shanghai 201800,China

Abstract: In this paper, we present a general theory of the double-undulator free-electron laser, in which an additional undulator with period close to the beam electron betatron oscillation period in the main undulator is introduced. A set of self-consistent equations is developed to describe the evolution of the optical wave in this device. The basic nonlinear equations are analyzed in the low-gain regime, the high-gain regime, and the saturation regime, respectively. By properly selecting parameters of the additional undulator, we may enhance the gain or efficiency of the free-electron laser.

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