Journal Article

PUBDB-2024-04712

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High gradient terahertz-driven ultrafast photogun

Ying, J. ; He, X. ; Su, D. ; Zheng, L. ; Kroh, T.CFEL*Extern* ; Rohwer, T.CFEL*Extern*DESY* ; Fakhari, M.CFEL*Extern*DESY* ; Kassier, G. H.CFEL*DESY* ; Ma, J. ; Yuan, P. ; Matlis, N. H.CFEL*DESY* ; Kärtner, F. X. (Corresponding author)CFEL*XFEL.EU*DESY* ; Zhang, D. (Corresponding author)CFEL*DESY*

2024
Nature Publ. Group London [u.a.]

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Please use a persistent id in citations: doi:10.1038/s41566-024-01441-y  doi:10.3204/PUBDB-2024-04712

Abstract: Terahertz (THz)-based electron acceleration has potential as a technology for next-generation cost-efficient compact electron sources. Although proof-of-principle demonstrations have proved the feasibility of many THz-driven accelerator components, THz-driven photoguns with sufficient brightness, energy and control for use in demanding ultrafast applications have yet to be achieved. Here we present a novel millimetre-scale multicell waveguide-based THz-driven photogun that exploits field enhancement to boost the electron energy, a movable cathode to achieve precise control over the accelerating phase as well as multiple cells for exquisite beam control. The short driving wavelength enables a peak acceleration gradient as high as ~3 GV m−1. Using microjoule-level single-cycle THz pulses, we demonstrate electron beams with up to ~14 keV electron energy, 1% energy spread and ~0.015 mm mrad transverse emittance. With a highly integrated rebunching cell, the bunch is further compressed by about ten times to 167 fs with ~10 fC charge. High-quality diffraction patterns of single-crystal silicon and projection microscopy images of the copper mesh are achieved. We are able to reveal the transient radial electric field developed from the charged particles on a copper mesh after photoexcitation with high spatio-temporal resolution, providing a potential scheme for plasma-based beam manipulation. Overall, these results represent a new record in energy, field gradient, beam quality and control for a THz-driven electron gun, enabling real applications in electron projection microscopy and diffraction. This is therefore a critical step and milestone in the development of all-optical THz-driven electron devices, validating the maturity of the technology and its use in precision applications.

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Contributing Institute(s):

1. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project G:(GEPRIS)194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
3. AIM, DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. AXSIS: Frontiers in Attosecond X-ray Science, Imaging and Spectroscopy

Appears in the scientific report 2024

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Nature ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 30 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Ying, J. ; He, X. ; Su, D. ; Zheng, L. ; Kroh, T.Extern* ; Rohwer, T.CFEL*Extern*DESY* ; Fakhari, M.CFEL*Extern*DESY* ; Kassier, G. H.CFEL*DESY* ; Ma, J. ; Yuan, P. ; Matlis, N.CFEL*DESY* ; Kärtner, F. (Corresponding author)CFEL*XFEL.EU*DESY* ; Zhang, D. (Corresponding author)CFEL*DESY*
Author Correction: High gradient terahertz-driven ultrafast photogun
Nature photonics 18(8), 878-878 (2024) [10.1038/s41566-024-01503-1]2024     Files BibTeX | EndNote: XML, Text | RIS

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