论文信息 - Tapered undulators for SASE FELs

Tapered undulators for SASE FELs

Abstract We discuss the use of tapered undulators to enhance the performance of free-electron lasers (FELs) based upon self-amplified spontaneous emission, where the radiation tends to have a relatively broad bandwidth and limited temporal coherence. Using the polychromatic FEL simulation code GINGER, we numerically demonstrate the effectiveness of tapered undulators for parameters corresponding to the Argonne low-energy undulator test line FEL and the proposed linac coherent light source.

[1] A. H. Lumpkin,et al. Exponential Gain and Saturation of a Self-Amplified Spontaneous Emission Free-Electron Laser , 2001, Science.

[2] Nikolai A. Vinokurov. Multisegment wigglers for short wavelength FEL , 1996 .

[3] J. Montgomery,et al. X-ray optics design studies for the SLAC 1.5-15 Å Linac Coherent Light Source (LCLS) , 1998 .

[4] Marlan O. Scully,et al. Free-electron generators of coherent radiation , 1980 .

[5] Pellegrini,et al. Spectrum, temporal structure, and fluctuations in a high-gain free-electron laser starting from noise. , 1994, Physical review letters.

[6] Hopkins,et al. High-efficiency extraction of microwave radiation from a tapered-wiggler free-electron laser. , 1986, Physical review letters.

[7] N. Vinokurov,et al. The magnetic and diagnostics systems for the Advanced Photon Source self-amplified spontaneously emitting FEL ☆ , 1999 .

[8] Claudio Pellegrini,et al. Collective instabilities and high-gain regime in a free electron laser , 1984 .