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

Abstract

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 effectmore » can not be ignored. This work can give a guidance to HXRSS FEL and XFELO commissioning for high efficiency FEL output.« less

Authors:
; ; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1508889
Alternate Identifier(s):
OSTI ID: 1532510
Grant/Contract Number:  
FWP-2013-SLAC-100164; AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 9; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Yang, Chuan, Tsai, Cheng-Ying, Zhou, Guanqun, Wang, Xiaofan, Hong, Ye, Krug, Emily Dong, Li, Alexandra, Deng, Haixiao, He, Duohui, and Wu, Juhao. The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser. United States: N. p., 2019. Web. doi:10.1364/OE.27.013229.
Yang, Chuan, Tsai, Cheng-Ying, Zhou, Guanqun, Wang, Xiaofan, Hong, Ye, Krug, Emily Dong, Li, Alexandra, Deng, Haixiao, He, Duohui, & Wu, Juhao. The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser. United States. doi:10.1364/OE.27.013229.
Yang, Chuan, Tsai, Cheng-Ying, Zhou, Guanqun, Wang, Xiaofan, Hong, Ye, Krug, Emily Dong, Li, Alexandra, Deng, Haixiao, He, Duohui, and Wu, Juhao. Thu . "The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser". United States. doi:10.1364/OE.27.013229.
@article{osti_1508889,
title = {The detuning effect of crystal monochromator in self-seeding and oscillator free electron laser},
author = {Yang, Chuan and Tsai, Cheng-Ying and Zhou, Guanqun and Wang, Xiaofan and Hong, Ye and Krug, Emily Dong and Li, Alexandra and Deng, Haixiao and He, Duohui and Wu, Juhao},
abstractNote = {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.},
doi = {10.1364/OE.27.013229},
journal = {Optics Express},
number = 9,
volume = 27,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.27.013229

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