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


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

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

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. More... »

PAGES

3300

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-39765-3

DOI

http://dx.doi.org/10.1038/s41598-019-39765-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112470810

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30824784


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38 schema:description 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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