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Title: Parallel-plate waveguides for terahertz-driven MeV electron bunch compression

Abstract

We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate waveguide (PPWG) that can focus single-cycle THz pulses along one dimension. We show test results of the tapered PPWG structure using electro-optic sampling (EOS) at the interaction region with peak fields of at least 300 kV/cm, given 0.9 µJ of incoming THz energy. We also present a modified shorted design of the tapered PPWG for better beam manipulation and reduced magnetic field as an alternative to a dual-feed approach. As an example, we demonstrate that with 5 µJ of THz energy, the PPWG compresses a 2.5 MeV electron bunch by a compression factor of more than 4, achieving a bunch length of about 18 fs.

Authors:
ORCiD logo; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546874
Alternate Identifier(s):
OSTI ID: 1562501
Grant/Contract Number:  
2015-SLAC-100238-Funding; AC02-05CH11231; AC02-76SF00515
Resource Type:
Journal Article: Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 17; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Othman, Mohamed A. K., Hoffmann, Matthias C., Kozina, Michael E., Wang, X. J., Li, R. K., and Nanni, Emilio A. Parallel-plate waveguides for terahertz-driven MeV electron bunch compression. United States: N. p., 2019. Web. doi:10.1364/OE.27.023791.
Othman, Mohamed A. K., Hoffmann, Matthias C., Kozina, Michael E., Wang, X. J., Li, R. K., & Nanni, Emilio A. Parallel-plate waveguides for terahertz-driven MeV electron bunch compression. United States. doi:10.1364/OE.27.023791.
Othman, Mohamed A. K., Hoffmann, Matthias C., Kozina, Michael E., Wang, X. J., Li, R. K., and Nanni, Emilio A. Mon . "Parallel-plate waveguides for terahertz-driven MeV electron bunch compression". United States. doi:10.1364/OE.27.023791.
@article{osti_1546874,
title = {Parallel-plate waveguides for terahertz-driven MeV electron bunch compression},
author = {Othman, Mohamed A. K. and Hoffmann, Matthias C. and Kozina, Michael E. and Wang, X. J. and Li, R. K. and Nanni, Emilio A.},
abstractNote = {We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate waveguide (PPWG) that can focus single-cycle THz pulses along one dimension. We show test results of the tapered PPWG structure using electro-optic sampling (EOS) at the interaction region with peak fields of at least 300 kV/cm, given 0.9 µJ of incoming THz energy. We also present a modified shorted design of the tapered PPWG for better beam manipulation and reduced magnetic field as an alternative to a dual-feed approach. As an example, we demonstrate that with 5 µJ of THz energy, the PPWG compresses a 2.5 MeV electron bunch by a compression factor of more than 4, achieving a bunch length of about 18 fs.},
doi = {10.1364/OE.27.023791},
journal = {Optics Express},
issn = {1094-4087},
number = 17,
volume = 27,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/OE.27.023791

Citation Metrics:
Cited by: 1 work
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Figures / Tables:

Fig. 1 Fig. 1: (a) Terahertz tapered parallel-plate waveguide for MeV electron bunch compression. (b) Example of single cycle THz waveform measured using EOS in free space (with a 100 µm thick GaP crystal) and its spectrum in (c) that is coupled into the structure. (d) The resulting electric field profile ofmore » the coupled THz electric field Ez field at a single frequency (0.65 THz).« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.