Abstract
A tabletop, short-pulse laser-based hard X-ray (Kα) source equipped with an advanced X-ray optics and dedicated for high-resolution spectroscopy and time-resolved diffraction is described. Operation of the source together with a high-resolution spectrometer containing a large-aperture highly annealed pyrolytic graphite gave a resolution E/ΔE of ~1,800 for the spectral range around Kα line of Cu. The estimated total flux of the 8.05-keV photons was equal to 5.9 × 1010 ph/s in 4π sr. Performance boost of the source caused by X-ray optics relied on the significant increase in the Cu-Kα photon flux on both, the sample (4.7 × 106 ph/s) and the detector (3.4 × 103 ph/s). A spectral brightness of 1.4 × 107 ph/s/mm2/mrad2 was derived from the source parameters for the Kα line. Better performance due to high collecting power and reflectivity of the spectrometer enabled application of the cross-correlation technique with an Ni foil. An upper bound of emission duration of 323 ± 47 fs was obtained in this measurement. X-ray absorption near-edge spectroscopy on an Ni sample with an acquisition time of only 15 min confirmed the increased capability of the setup also for continuous spectrum (bremsstrahlung).
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Acknowledgments
PVN acknowledges support of the World Class University program (R31-2008-000-10026-0) grant provided by National Research Foundation (NRF) of Korea. HS acknowledges support by the BMBF German-Korean Collaboration Program (no. KOR 10/016). The project was also supported by the Ministry of Education, Science and Technology of Korea through Basic Science Research Program (No. R15-2008-006-03001-0), the Korea-Germany collaboration program of Korean National Research Foundation (no. 2010-00633) and by Gwangju Institute of Science and Technology through a grant from the DASAN fund and the Photonics 2020 project.
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Iqbal, M., Urrehman, Z., Im, H. et al. Performance improvement of a Kα source by a high-resolution thin-layer-graphite spectrometer and a polycapillary lens. Appl. Phys. B 116, 305–311 (2014). https://doi.org/10.1007/s00340-013-5691-z
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DOI: https://doi.org/10.1007/s00340-013-5691-z