Experimental demonstration of the mechanism of steady-state microbunching

Xiujie Deng, Alexander Chao, Jörg Feikes (), Arne Hoehl, Wenhui Huang, Roman Klein, Arnold Kruschinski, Ji Li, Aleksandr Matveenko, Yuriy Petenev, Markus Ries, Chuanxiang Tang () and Lixin Yan
Additional contact information
Xiujie Deng: Tsinghua University
Alexander Chao: Tsinghua University
Jörg Feikes: Helmholtz-Zentrum Berlin (HZB)
Arne Hoehl: Physikalisch-Technische Bundesanstalt (PTB)
Wenhui Huang: Tsinghua University
Roman Klein: Physikalisch-Technische Bundesanstalt (PTB)
Arnold Kruschinski: Helmholtz-Zentrum Berlin (HZB)
Ji Li: Helmholtz-Zentrum Berlin (HZB)
Aleksandr Matveenko: Helmholtz-Zentrum Berlin (HZB)
Yuriy Petenev: Helmholtz-Zentrum Berlin (HZB)
Markus Ries: Helmholtz-Zentrum Berlin (HZB)
Chuanxiang Tang: Tsinghua University
Lixin Yan: Tsinghua University

Nature, 2021, vol. 590, issue 7847, 576-579

Abstract: Abstract The use of particle accelerators as photon sources has enabled advances in science and technology1. Currently the workhorses of such sources are storage-ring-based synchrotron radiation facilities2–4 and linear-accelerator-based free-electron lasers5–14. Synchrotron radiation facilities deliver photons with high repetition rates but relatively low power, owing to their temporally incoherent nature. Free-electron lasers produce radiation with high peak brightness, but their repetition rate is limited by the driving sources. The steady-state microbunching15–22 (SSMB) mechanism has been proposed to generate high-repetition, high-power radiation at wavelengths ranging from the terahertz scale to the extreme ultraviolet. This is accomplished by using microbunching-enabled multiparticle coherent enhancement of the radiation in an electron storage ring on a steady-state turn-by-turn basis. A crucial step in unveiling the potential of SSMB as a future photon source is the demonstration of its mechanism in a real machine. Here we report an experimental demonstration of the SSMB mechanism. We show that electron bunches stored in a quasi-isochronous ring can yield sub-micrometre microbunching and coherent radiation, one complete revolution after energy modulation induced by a 1,064-nanometre-wavelength laser. Our results verify that the optical phases of electrons can be correlated turn by turn at a precision of sub-laser wavelengths. On the basis of this phase correlation, we expect that SSMB will be realized by applying a phase-locked laser that interacts with the electrons turn by turn. This demonstration represents a milestone towards the implementation of an SSMB-based high-repetition, high-power photon source.

Date: 2021
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DOI: 10.1038/s41586-021-03203-0

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