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High-brightness self-seeded X-ray free-electron laser covering the 3.5 keV to 14.6 keV range

Abstract

A self-seeded X-ray free-electron laser (XFEL) is a promising approach to realize bright, fully coherent free-electron laser (FEL) sources in the hard X-ray domain that have been a long-standing issue with longitudinal coherence remaining challenging. At the Pohang Accelerator Laboratory XFEL, we have demonstrated a hard X-ray self-seeded XFEL with a peak brightness of 3.2 × 1035 photons s–1 mm–2 mrad–2 0.1% bandwidth (BW)–1 at 9.7 keV. The bandwidth (0.19 eV) is about 1/70 times as wide (close to the Fourier transform limit) and the peak spectral brightness is 40 times higher than in self-amplified spontaneous emission (SASE), with substantial improvements in the stability of self-seeding and noticeably suppressed pedestal effects. We could reach an excellent self-seeding performance at a photon energy of 3.5 keV (lowest) and 14.6 keV (highest) with the same stability as the 9.7 keV self-seeding. The bandwidth of the 14.6 keV seeded FEL was 0.32 eV, and the peak brightness was 1.3 × 1035 photons s–1 mm–1 mrad–1 0.1%BW–1. We show that the use of seeded FEL pulses with higher reproducibility and a cleaner spectrum results in serial femtosecond crystallography data of superior quality compared with data collected using SASE mode.

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Fig. 1: Schematic diagram of the self-seeding experiment at PAL-XFEL.
Fig. 2: Suppression of the MBI by the laser heater for 9.7 keV photon energy.
Fig. 3: Spectral intensity of the self-seeded versus SASE XFEL for 9.7 keV FEL.
Fig. 4: Spectral intensity of the self-seeded versus SASE XFEL for 3.5 keV and 14.6 keV.
Fig. 5: Data quality indicators as a function of resolution.

Data availability

The raw data CXI files and geometry files have been deposited in the Coherent X-ray Imaging Data Bank (CXIDB; https://www.cxidb.org/). The coordinates and structural factors have been deposited in the Research Collaboratory for Structural Bioinformatics (RCSB) under the accession codes 7BYO/7D01/7D04 (for lysozyme from the self-seeded mode) and 7BYP/7D02/7D05 (for lysozyme from the SASE mode). The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.

Code availability

The line plots, dot plots and bar graphs reported in Fig. 5, Supplementary Fig. 6 and Supplementary Fig. 7 were made based on the calculation results using version 0.9.1 of the CrystFEL suite available at https://www.desy.de/~twhite/crystfel/.

References

  1. 1.

    Emma, P. et al. First lasing and operation of an ångstrom-wavelength free-electron laser. Nat. Photon. 4, 641–647 (2010).

    ADS  Article  Google Scholar 

  2. 2.

    Tanaka, H. et al. A compact X-ray free-electron laser emitting in the sub-ångström region. Nat. Photon. 6, 540–544 (2012).

    ADS  Article  Google Scholar 

  3. 3.

    Kang, H.-S. et al. Hard X-ray free-electron laser with femtosecond-scale timing jitter. Nat. Photon. 11, 708–713 (2017).

    ADS  Article  Google Scholar 

  4. 4.

    Decking, W. et al. A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator. Nat. Photon. 14, 391–397 (2020).

    ADS  Article  Google Scholar 

  5. 5.

    Prat, E. et al. A compact and cost-effective hard X-ray free-electron laser driven by a high-brightness and low-energy electron beam. Nat. Photon. 14, 748–754 (2020).

    ADS  Article  Google Scholar 

  6. 6.

    Callegari, C, et al. Atomic, molecular and optical physics applications of longitudinally coherent and narrow bandwidth free-electron lasers. Phys. Rep. https://doi.org/10.1016/j.physrep.2020.12.002 (2021).

  7. 7.

    Adams, B. et al. Scientific opportunities with an X-ray free-electron laser oscillator. Preprint at https://arxiv.org/abs/1903.09317 (2019).

  8. 8.

    Abbamonte, P. et al. New Science Opportunities Enabled by LCLS-II X-ray Lasers SLAC-R-1053, 3–189 (SLAC National Accelerator Laboratory, 2015).

  9. 9.

    Yu, L.-H. et al. High-gain harmonic-generation free-electron laser. Science 289, 932–934 (2000).

    ADS  Article  Google Scholar 

  10. 10.

    Stupakov, G. Using the beam-echo effect for generation of short-wavelength radiation. Phys. Rev. Lett. 102, 074801 (2009).

    ADS  Article  Google Scholar 

  11. 11.

    Ribič, P. R. et al. Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser. Nat. Photon. 13, 555–561 (2019).

    Article  Google Scholar 

  12. 12.

    Feldhaus, J., Saldin, E. L., Schneider, J. R., Schneidmiller, E. A. & Yurkov, M. V. Possible application of X-ray optical elements for reducing the spectral bandwidth of an X-ray SASE FEL. Opt. Commun. 140, 341–352 (1997).

    ADS  Article  Google Scholar 

  13. 13.

    Saldin, E. L., Schneidmiller, E. A., Shvyd’ko, Yu. V. & Yurkov, M. V. X-ray FEL with a meV bandwidth. Nucl. Instrum. Methods Phys. Res. A 475, 357–362 (2001).

    ADS  Article  Google Scholar 

  14. 14.

    Geloni, G., Kocharyan, V. & Saldin, E. A novel self-seeding scheme for hard X-ray FELs. J. Mod. Opt. 58, 1391–1403 (2011).

    ADS  Article  Google Scholar 

  15. 15.

    Shvyd’ko, Yu. V. & Lindberg, R. R. Spatiotemporal response of crystals in X-ray Bragg diffraction. Phys. Rev. ST Accel. Beams 15, 100702 (2012).

    ADS  Article  Google Scholar 

  16. 16.

    Lindberg, R. R. & Shvyd’ko, Yu. V. Time dependence of Bragg forward scattering and self-seeding of hard X-ray free-electron lasers. Phys. Rev. ST Accel. Beams 15, 050706 (2012).

    ADS  Article  Google Scholar 

  17. 17.

    Amann, J. et al. Demonstration of self-seeding in a hard-X-ray free-electron laser. Nat. Photon. 6, 693–698 (2012).

    ADS  Article  Google Scholar 

  18. 18.

    Emma, C. et al. Experimental demonstration of fresh bunch self-seeding in an X-ray free electron laser. Appl. Phys. Lett. 110, 154101 (2017).

    ADS  Article  Google Scholar 

  19. 19.

    Ratner, D. et al. Experimental demonstration of a soft X-ray self-seeded free-electron laser. Phys. Rev. Lett. 114, 054801 (2015).

    ADS  Article  Google Scholar 

  20. 20.

    Marcus, G. et al. Experimental observations of seed growth and accompanying pedestal contamination in a self-seeded, soft x-ray free-electron laser. Phys. Rev. Accel. Beams 22, 080702 (2019).

    ADS  Article  Google Scholar 

  21. 21.

    Inoue, I. et al. Generation of narrow-band X-ray free-electron laser via reflection self-seeding. Nat. Photon. 13, 319–322 (2019).

    ADS  Article  Google Scholar 

  22. 22.

    Matsumura, S. et al. High-resolution micro channel-cut crystal monochromator processed by plasma chemical vaporization machining for a reflection self-seeded X-ray free-electron laser. Opt. Express 28, 25706–25715 (2020).

    ADS  Article  Google Scholar 

  23. 23.

    Min, C.-K. et al. Hard X-ray self-seeding commissioning at PAL-XFEL. J. Synchrot. Radiat. 26, 1101–1109 (2019).

    Article  Google Scholar 

  24. 24.

    Ding, Y. et al. Femtosecond X-ray pulse characterization in free-electron lasers using a cross-correlation technique. Phys. Rev. Lett. 109, 254802 (2012).

    ADS  Article  Google Scholar 

  25. 25.

    Yang, X. & Shvyd’ko, Yu. V. Maximizing spectral flux from self-seeding hard X-ray free electron lasers. Phys. Rev. ST Accel. Beams 16, 120701 (2013).

    ADS  Article  Google Scholar 

  26. 26.

    Riyopoulos, S. & Tang, C. M. The structure of the sideband spectrum in free electron lasers. Phys. Fluids 31, 1708–1719 (1988).

    ADS  Article  Google Scholar 

  27. 27.

    Riyopoulos, S. & Tang, C. M. Chaotic electron motion caused by sidebands in free electron lasers. Phys. Fluids 31, 3387–3402 (1988).

    ADS  Article  Google Scholar 

  28. 28.

    Huang, Z. et al. Measurements of the linac coherent light source laser heater and its impact on the x-ray free-electron laser performance. Phys. Rev. ST Accel. Beams 13, 020703 (2010).

    ADS  Article  Google Scholar 

  29. 29.

    Ratner, D. et al. Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source. Phys. Rev. ST Accel. Beams 18, 030704 (2015).

    ADS  Article  Google Scholar 

  30. 30.

    Lee, J. et al. PAL-XFEL laser heater commissioning. Nucl. Instrum. Methods Phys. Res. A 843, 39–45 (2017).

    ADS  Article  Google Scholar 

  31. 31.

    Kang, H.-S. et al. FEL performance achieved at PAL-XFEL using a three-chicane bunch compression scheme. J. Synchrot. Radiat. 26, 1127–1138 (2019).

    Article  Google Scholar 

  32. 32.

    Zhu, D. et al. A single-shot transmissive spectrometer for hard X-ray free-electron lasers. Appl. Phys. Lett. 101, 034103 (2012).

    ADS  Article  Google Scholar 

  33. 33.

    Loos, H. Operational experience at LCLS. In Proc. 2011 Free Electron Laser Conference 166–172 (JACOW, 2011).

  34. 34.

    Shu, D. et al. Mechanical design of a diamond crystal hard X-ray self-seeding monochromator for PAL-XFEL. In Proc. 2019 Particle Accelerator Conference 554 (JACOW, 2019).

  35. 35.

    Shvyd’ko, Y. V. et al. Diamond double-crystal system for a forward Bragg diffraction X-ray monochromator of the self-seeded PAL XFEL. In Proc. 2017 Free-Electron Laser Conference 29–33 (JACOW, 2017).

  36. 36.

    Shu, D. et al. Design of a diamond-crystal monochromator for the LCLS hard x-ray self-seeding project. J. Phys. Conf. Ser. 425, 052004 (2013).

    Article  Google Scholar 

  37. 37.

    Chapman, H. N. X-ray free-electron lasers for the structure and dynamics of macromolecules. Annu. Rev. Biochem. 88, 35–58 (2019).

    Article  Google Scholar 

  38. 38.

    Fromme, P. XFELs open a new era in structural chemical biology. Nat. Chem. Biol. 11, 895–899 (2015).

    Article  Google Scholar 

  39. 39.

    Nass, K. et al. Protein structure determination by single-wavelength anomalous diffraction phasing of X-ray free-electron laser data. IUCrJ 3, 180–191 (2016).

    Article  Google Scholar 

  40. 40.

    Barends, T. R. M. et al. De novo protein crystal structure determination from X-ray free-electron laser data. Nature 505, 244–247 (2014).

    ADS  Article  Google Scholar 

  41. 41.

    Barends, T. et al. Effects of self-seeding and crystal post-selection on the quality of Monte Carlo-integrated SFX data. J. Synchrot. Radiat. 22, 644–652 (2015).

    Article  Google Scholar 

  42. 42.

    Miao, J., Ishikawa, T., Robinson, I. K. & Murnane, M. M. Beyond crystallography: diffractive imaging using coherent x-ray light sources. Science 348, 530–535 (2015).

    ADS  MathSciNet  Article  Google Scholar 

  43. 43.

    Ayyer, K. et al. Perspectives for imaging single protein molecules with the present design of the European XFEL. Struct. Dynam. 2, 041702 (2015).

    Article  Google Scholar 

  44. 44.

    Huang, Z. et al. Suppression of microbunching instability in the linac coherent light source. Phys. Rev. ST Accel. Beams 7, 074401 (2004).

    ADS  Article  Google Scholar 

  45. 45.

    Ko, J. H., Kim, G., Kim, C., Kang, H.-S. & Ko, I. S. Coherent synchrotron radiation monitor for microbunching instability in XFEL. Rev. Sci. Instrum. 89, 063302 (2018).

    ADS  Article  Google Scholar 

Download references

Acknowledgements

We gratefully acknowledge discussions with A. A. Lutman, F.-J. Decker, Z. Huang and H. Loos. The XFEL experiments were performed at the Nano Crystallography & Coherent Imaging (NCI) PAL-XFEL experimental station. This research has been supported by the Ministry of Science and Information, Communications & Technology (ICT) of Korea (grant number 2018R1A6B4023605) and in part by the Basic Science Research Program (grant numbers 2017R1A2B4007274, 2020R1F1A1075828, 2019R1C1C1003687) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea.

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C.-K.M., Y.S., K.-J.K., S.J.L., J.P. and H.-S.K. conceived the idea of the experiment. B.O., D.N., Y.J.S., D.S., S.T. and V.B. contributed to the design of the self-seeding system. H.Y., M.H.C., C.K., M.-J.K., C.H.S., J.H.K. and H. Heo contributed to the machine operation and tuning for the self-seeding experiment. I.N., C.H.S., C.-K.M. and H.-S.K. acquired and analysed the self-seeding data. I.N. and C.-K.M. contributed to the optimization of a laser heater. G.K. developed the analysis tools for the self-seeding experiments. J.P., J.K., S.P., G.P., S.K., S.H.C., H. Hyun, J.H.L., K.S.K., I.E. and S.R. contributed to the SFX experiment. G.P. and S.J.L. contributed to the analysis of the SFX data. I.N., C.-K.M., S.J.L. and H.-S.K. wrote the manuscript, which was discussed and agreed by all the co-authors.

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Correspondence to Yuri Shvyd’ko or Sang Jae Lee or Heung-Sik Kang.

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The authors declare no competing interests.

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Peer review information Nature Photonics thanks David Attwood and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Supplementary Figs. 1–8, Discussion and Tables 1–2.

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Nam, I., Min, CK., Oh, B. et al. High-brightness self-seeded X-ray free-electron laser covering the 3.5 keV to 14.6 keV range. Nat. Photonics (2021). https://doi.org/10.1038/s41566-021-00777-z

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