Coherence and pulse duration characterization of the PAL-XFEL in the hard X-ray regime

Kyuseok Yun; Sungwon Kim; Dongjin Kim; Myungwoo Chung; Wonhyuk Jo; Hyerim Hwang; Daewoong Nam; Sangsoo Kim; Jangwoo Kim; Sang Youn Park; Kyung Sook Kim; Changyong Song; Sooheyong Lee; Hyunjung Kim

doi:10.1038/s41598-019-39765-3

Coherence and pulse duration characterization of the PAL-XFEL in the hard X-ray regime

Kyuseok Yun, Sungwon Kim, Dongjin Kim, Myungwoo Chung, Wonhyuk Jo, Hyerim Hwang, Daewoong Nam, Sangsoo Kim, Jangwoo Kim, Sang Youn Park, Kyung Sook Kim, Changyong Song, Sooheyong Lee, Hyunjung Kim

Department of Chemical Engineering & Materials Science

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

We characterize the spatial and temporal coherence properties of hard X-ray pulses from the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL, Pohang, Korea). The measurement of the single-shot speckle contrast, together with the introduction of corrections considering experimental conditions, allows obtaining an intrinsic degree of transverse coherence of 0.85 ± 0.06. In the Self-Amplified Spontaneous Emission regime, the analysis of the intensity distribution of X-ray pulses also provides an estimate for the number of longitudinal modes. For monochromatic and pink (i.e. natural bandwidth provided by the first harmonic of the undulator) beams, we observe that the number of temporal modes is 6.0 ± 0.4 and 90.0 ± 7.2, respectively. Assuming a coherence time of 2.06 fs and 0.14 fs for the monochromatic and pink beam respectively, we estimate an average X-ray pulse duration of 12.6 ± 1.0 fs.

Original language	English
Article number	3300
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-39765-3
State	Published - 1 Dec 2019

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© 2019, The Author(s).

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title = "Coherence and pulse duration characterization of the PAL-XFEL in the hard X-ray regime",

abstract = "We characterize the spatial and temporal coherence properties of hard X-ray pulses from the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL, Pohang, Korea). The measurement of the single-shot speckle contrast, together with the introduction of corrections considering experimental conditions, allows obtaining an intrinsic degree of transverse coherence of 0.85 ± 0.06. In the Self-Amplified Spontaneous Emission regime, the analysis of the intensity distribution of X-ray pulses also provides an estimate for the number of longitudinal modes. For monochromatic and pink (i.e. natural bandwidth provided by the first harmonic of the undulator) beams, we observe that the number of temporal modes is 6.0 ± 0.4 and 90.0 ± 7.2, respectively. Assuming a coherence time of 2.06 fs and 0.14 fs for the monochromatic and pink beam respectively, we estimate an average X-ray pulse duration of 12.6 ± 1.0 fs.",

author = "Kyuseok Yun and Sungwon Kim and Dongjin Kim and Myungwoo Chung and Wonhyuk Jo and Hyerim Hwang and Daewoong Nam and Sangsoo Kim and Jangwoo Kim and Park, {Sang Youn} and Kim, {Kyung Sook} and Changyong Song and Sooheyong Lee and Hyunjung Kim",

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doi = "10.1038/s41598-019-39765-3",

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T1 - Coherence and pulse duration characterization of the PAL-XFEL in the hard X-ray regime

AU - Yun, Kyuseok

AU - Kim, Sungwon

AU - Kim, Dongjin

AU - Chung, Myungwoo

AU - Jo, Wonhyuk

AU - Hwang, Hyerim

AU - Nam, Daewoong

AU - Kim, Sangsoo

AU - Kim, Jangwoo

AU - Park, Sang Youn

AU - Kim, Kyung Sook

AU - Song, Changyong

AU - Lee, Sooheyong

AU - Kim, Hyunjung

PY - 2019/12/1

Y1 - 2019/12/1

N2 - We characterize the spatial and temporal coherence properties of hard X-ray pulses from the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL, Pohang, Korea). The measurement of the single-shot speckle contrast, together with the introduction of corrections considering experimental conditions, allows obtaining an intrinsic degree of transverse coherence of 0.85 ± 0.06. In the Self-Amplified Spontaneous Emission regime, the analysis of the intensity distribution of X-ray pulses also provides an estimate for the number of longitudinal modes. For monochromatic and pink (i.e. natural bandwidth provided by the first harmonic of the undulator) beams, we observe that the number of temporal modes is 6.0 ± 0.4 and 90.0 ± 7.2, respectively. Assuming a coherence time of 2.06 fs and 0.14 fs for the monochromatic and pink beam respectively, we estimate an average X-ray pulse duration of 12.6 ± 1.0 fs.

AB - We characterize the spatial and temporal coherence properties of hard X-ray pulses from the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL, Pohang, Korea). The measurement of the single-shot speckle contrast, together with the introduction of corrections considering experimental conditions, allows obtaining an intrinsic degree of transverse coherence of 0.85 ± 0.06. In the Self-Amplified Spontaneous Emission regime, the analysis of the intensity distribution of X-ray pulses also provides an estimate for the number of longitudinal modes. For monochromatic and pink (i.e. natural bandwidth provided by the first harmonic of the undulator) beams, we observe that the number of temporal modes is 6.0 ± 0.4 and 90.0 ± 7.2, respectively. Assuming a coherence time of 2.06 fs and 0.14 fs for the monochromatic and pink beam respectively, we estimate an average X-ray pulse duration of 12.6 ± 1.0 fs.

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DO - 10.1038/s41598-019-39765-3

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VL - 9

JO - Scientific Reports

JF - Scientific Reports

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M1 - 3300

ER -

Coherence and pulse duration characterization of the PAL-XFEL in the hard X-ray regime

Abstract

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