ScienceDirect - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment : Simulation of prebunching in free-electron lasers

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume 507, Issues 1-2, 11 July 2003, Pages 400-403
Proceedings of the 24th International Free Electron Laser Conference and the 9th Users Workshop.

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doi:10.1016/S0168-9002(03)00953-7

Simulation of prebunching in free-electron lasers

H. P. Freund ^,^,^a, P. G. O’Shea^b and J. Neumann^b

^a Science Applications International Corporation, 1710 Goodridge Drive, McLean, VA 22102, USA ^b Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USA

Available online 18 March 2003.

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Abstract

Prebunched beams are used in many coherent radiation sources. If the beam is bunched on scale lengths comparable or shorter than the desired wavelength, then the resonant wavelength is excited without a drive signal and grows faster than exponential. A free-electron laser with a prebunched beam combines the best characteristics of amplifiers and oscillators. In comparison with oscillators, no drive signal is needed and the wiggler is short. In comparison with amplifiers, no resonator is needed. Simulation of enhanced bunching has been demonstrated using the MEDUSA simulation code (IEEE J. Quantum Electron. 36 (2000) 275; Nucl. Instr. and Meth. A 475 (2001) 381; Nucl. Instr. and Meth. A 475 (2001) 118) for optical klystrons (Nucl. Instr. and Meth. A 475 (2001) 381) and high-gain harmonic generation (Nucl. Instr. and Meth. A 475 (2001) 118). In the latter case, modulation of the beam in one wiggler was enhanced in a magnetic chicane prior to injection into a second wiggler. We describe modifications to MEDUSA to simulate prebunching, and the application of the code to study requirements and limitations on the process.

Author Keywords: Free-electron lasers; Prebunched beams

PACS classification codes: 41.60.Cr; 52.75.Ms