The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser

Yang, Chuan; Tsai, Cheng-Ying; Zhou, Guanqun; Wang, Xiaofan; Hong, Ye; Krug, Emily Dong; Li, Alexandra; Deng, Haixiao; He, Duohui; Wu, Juhao

doi:10.1364/OE.27.013229

Title: The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser

Journal Article · Thu Apr 25 00:00:00 EDT 2019 · Optics Express

DOI:https://doi.org/10.1364/OE.27.013229· OSTI ID:1508889

Yang, Chuan; Tsai, Cheng-Ying; Zhou, Guanqun; Wang, Xiaofan; Hong, Ye; Krug, Emily Dong; Li, Alexandra; Deng, Haixiao; He, Duohui;

Self-amplified spontaneous emission (SASE) free electron laser (FEL) is capable of generating ultra-short, high power and high brightness X-ray pulses, but its temporal coherence is poor. Self-seeding scheme is an approach to improve the temporal coherence by employing a crystal monochromator. The crystal detuning effect is the phenomenon that the Bragg angle deviates from the middle of the reflection domain due to the refraction effect, and can affect the seed power of hard X-ray self-seeding (HXRSS) FEL. In this paper, we introduce a novel idea to maximize the seed power by tuning the incident angle off the Bragg condition where the Bragg photon energy is corresponding to the central photon energy of the input X-ray pulse. We present the numerical analysis of the detuning effect in different reflecting atomic planes and different asymmetry angles of diamond crystal. Furthermore, we analyze how the detuning affects the seed efficiency of HXRSS FEL, and discuss the application to X-ray FEL oscillator (XFELO). We find when the detuning is much smaller than the bandwidth of input X-ray pulse, we can neglect the detuning effect. However, if the detuning is much larger than or comparable with the bandwidth of input X-ray pulse, the detuning effect can not be ignored. This work can give a guidance to HXRSS FEL and XFELO commissioning for high efficiency FEL output.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FWP-2013-SLAC-100164; AC02-76SF00515

OSTI ID:: 1508889

Alternate ID(s):: OSTI ID: 1532510

Journal Information:: Optics Express, Journal Name: Optics Express Vol. 27 Journal Issue: 9; ISSN 1094-4087

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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