AI Article Synopsis
- - The study measures the coherence properties of hard X-ray pulses from the PAL-XFEL using single-shot speckle contrast, revealing a high transverse coherence degree of 0.85±0.06.
- - The analysis, centered around the Self-Amplified Spontaneous Emission regime, estimates the number of temporal modes for different types of X-ray beams, identifying 6.0±0.4 for monochromatic and 90.0±7.2 for pink beams.
- - Based on the calculated coherence times of 2.06 fs for monochromatic and 0.14 fs for pink beams, the average X-ray pulse duration is estimated at 12.6±1.0 fs.
Article 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6397240 | PMC |
| http://dx.doi.org/10.1038/s41598-019-39765-3 | DOI Listing |
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