Article

Segmented terahertz electron accelerator and manipulator (STEAM)

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Abstract

Acceleration and manipulation of electron bunches underlie most electron and X-ray devices used for ultrafast imaging and spectroscopy. New terahertz-driven concepts offer orders-of-magnitude improvements in field strengths, field gradients, laser synchronization and compactness relative to conventional radiofrequency devices, enabling shorter electron bunches and higher resolution with less infrastructure while maintaining high charge capacities (pC), repetition rates (kHz) and stability. We present a segmented terahertz electron accelerator and manipulator (STEAM) capable of performing multiple high-field operations on the six-dimensional phase space of ultrashort electron bunches. With this single device, powered by few-microjoule, single-cycle, 0.3 THz pulses, we demonstrate record terahertz acceleration of >30 keV, streaking with <10 fs resolution, focusing with >2 kT m–1 strength, compression to ~100 fs as well as real-time switching between these modes of operation. The STEAM device demonstrates the feasibility of terahertz-based electron accelerators, manipulators and diagnostic tools, enabling science beyond current resolution frontiers with transformative impact.

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Acknowledgements

We gratefully acknowledge helpful discussions with C. Zhou, W. R. Huang, F. Ahr and W. Qiao, the expert technical support of T. Tilp, and M. Schust for fabrication of the STEAM devices used in this work. Besides Deutsches Elektronen Synchrotron (DESY) and the Helmholtz Association, this work was supported by the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013) through the Synergy Grant ‘Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy’ (AXSIS) (609920) and the excellence cluster 'The Hamburg Center for Ultrafast Imaging – Structure, Dynamics and Control of Matter at the Atomic Scale' (CUI, DFG-EXC1074), the priority programme ‘Quantum Dynamics in Tailored Intense Fields’ (QUTIF) (SPP1840 SOLSTICE) of the Deutsche Forschungsgemeinschaft and the accelerator on a chip programme (ACHIP) funded by the Gordon and Betty Moore Foundation (GBMF4744). The authors also thank T. Y. Fan and J. Zayhowski from MIT Lincoln Laboratory for initial work on the cryogenic Yb:YLF laser within the AXIS Program funded by the Defense Advanced Research Projects Agency (DARPA) and DARPA for the loan of the laser. X.W. acknowledges support through a Georg Forster Research Fellowship of the Alexander von Humboldt Foundation and A.-L.C through a Helmholtz Postdoctoral Fellowship from the Helmholtz Association.

Author information

Author notes

    • Xiaojun Wu

    Present address: School of Electronic and Information Engineering, Beihang University, Beijing, China

  1. These authors contributed equally: Dongfang Zhang and Arya Fallahi.

Affiliations

  1. Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Hamburg, Germany

    • Dongfang Zhang
    • , Arya Fallahi
    • , Michael Hemmer
    • , Xiaojun Wu
    • , Moein Fakhari
    • , Yi Hua
    • , Huseyin Cankaya
    • , Anne-Laure Calendron
    • , Luis E. Zapata
    • , Nicholas H. Matlis
    •  & Franz X. Kärtner
  2. Department of Physics and The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, Germany

    • Dongfang Zhang
    • , Moein Fakhari
    • , Anne-Laure Calendron
    •  & Franz X. Kärtner
  3. Research Laboratory of Electronics, MIT, Cambridge, MA, USA

    • Franz X. Kärtner

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Contributions

F.X.K., D.Z., A.F. and N.H.M. conceived and coordinated the terahertz-driven electron acceleration and manipulation project. The structure was designed by A.F. and M.F. D.Z. designed the experimental setup and carried out the experiments. M.H., L.E.Z. and Y.H. built the Yb:YLF laser. A.-L.C. built the Yb:KYW laser with the help of H.C. X.W. and D.Z. built the terahertz setup. D.Z. built the ultraviolet generation and automated the setup. A.F. performed all simulations. A.-L.C., H.C., M.H., Y.H. and L.E.Z. maintained the laser systems and contributed with helpful discussions on the experiment. D.Z., A.F., N.H.M. and F.X.K. wrote the manuscript with revisions by all.

Competing interests

The authors declare no competing interests.

Corresponding author

Correspondence to Dongfang Zhang.

Supplementary information

  1. Supplementary Information

    Supplementary notes and figures.

  2. Supplementary Video 1

    THz field development as a function of time inside the STEAM device.