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The results of the numerical simulation of the temporal profile of the seeded FEL output pulses when a 13th-order harmonic pulse are introduced into the undulator(s) to interact with an electron bunch whose durations are (a) 0

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posted on 13.08.2013 by T Sato, T Togashi, K Yamakawa, M Aoyama, K Midorikawa, E J Takahashi, K Yamanouchi, S Owada, A Iwasaki, K Fukami

Figure 4. The results of the numerical simulation of the temporal profile of the seeded FEL output pulses when a 13th-order harmonic pulse are introduced into the undulator(s) to interact with an electron bunch whose durations are (a) 0. 2 ps, (b) 0.6 ps and (c) 1 ps. The solid and dashed lines represent respectively the temporal profiles obtained using one undulator (4.5 m length) and those obtained using two undulators (9 m length in total).

Abstract

By introducing 13th- (61.7 nm) and 15th-order harmonics (53.4 nm) of femtosecond laser pulses at 800 nm into an undulator of SCSS (SPring-8 Compact SASE Source) test accelerator at RIKEN, these harmonic pulses were amplified by a factor of more than 102 with a high contrast ratio through the interaction between accelerated electron bunches and the harmonic pulses. From numerical simulations of the amplification processes of high-order harmonic pulses in the undulator, optimum conditions of the electron bunch duration interacting with the high-order harmonic pulses were investigated for generating full-coherent and intense pulses in the extreme ultraviolet wavelength region.

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