Coherence time characterization method for hard X-ray free-electron lasers

被引：1

作者：

Zhou, Guanqun ^{[1
,2
,3
]}

Jiao, Yi ^{[1
]}

Raubenheimer, Tor O. ^{[2
]}

Wang, Jiuqing ^{[1
,3
]}

Holman, Aaron J. ^{[4
,5
]}

Tsai, Cheng-Ying ^{[6
]}

Wu, Jerome Y. ^{[7
]}

Wu, Weiwei ^{[8
]}

Yang, Chuan ^{[9
]}

Yoon, Moohyun ^{[10
]}

Wu, Juhao ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Accelerat Phys & Technol, Beijing 100049, Peoples R China

[2] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94309 USA

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[5] Univ Chicago, Pritzker Sch Mol Engn, Chicago, IL 60637 USA

[6] Huazhong Univ Sci & Technol, Wuhan 430074, Peoples R China

[7] Jane Lathrop Stanford Middle Sch, 480 E Meadow Dr, Palo Alto, CA 94306 USA

[8] JSerra Catholic High Sch, 26351 Junipero Serra Rd, San Juan Capistrano, CA 92675 USA

[9] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[10] Pohang Univ Sci & Technol, Pohang 37673, South Korea

来源：

OPTICS EXPRESS | 2020年 / 28卷 / 08期

关键词：

TEMPORAL COHERENCE; DYNAMICS; PULSES;

D O I：

10.1364/OE.28.010928

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Coherence time is one of the fundamental characteristics of light sources. Methods based on autocorrelation have been widely applied from optical domain to soft X-rays to characterize the radiation coherence time. However, for the hard X-ray regime, due to the lack of proper mirrors, it is extremely difficult to implement such autocorrelation scheme. In this paper, a novel approach for characterizing the coherence time of a hard X-ray free-electron laser (FEL) is proposed and validated numerically. A phase shifter is adopted to control the correlation between X-ray and microbunched electrons. The coherence time of the FEL pulse can be extracted from the cross-correlation. Semi-analytical analysis and three-dimensional time-dependent numerical simulations are presented to elaborate the details. A coherence time of 218.2 attoseconds for 6.92 keV X-ray FEL pulses is obtained in our simulation based on the configuration of Linac Coherent Light Source. This approach provides critical temporal coherence diagnostics for X-ray FELs, and is decoupled from machine parameters, applicable for any photon energy, radiation brightness, repetition rate and FEL pulse duration. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：10928 / 10938

页数：11

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