Experimental Characterization of Electron-Beam-Driven Wakefield Modes in a Dielectric-Woodpile Cartesian Symmetric Structure

P. D. Hoang, G. Andonian, I. Gadjev, B. Naranjo, Y. Sakai, N. Sudar, O. Williams, M. Fedurin, K. Kusche, C. Swinson, P. Zhang, and J. B. Rosenzweig
Phys. Rev. Lett. 120, 164801 – Published 19 April 2018

Abstract

Photonic structures operating in the terahertz (THz) spectral region enable the essential characteristics of confinement, modal control, and electric field shielding for very high gradient accelerators based on wakefields in dielectrics. We report here an experimental investigation of THz wakefield modes in a three-dimensional photonic woodpile structure. Selective control in exciting or suppressing of wakefield modes with a nonzero transverse wave vector is demonstrated by using drive beams of varying transverse ellipticity. Additionally, we show that the wakefield spectrum is insensitive to the offset position of strongly elliptical beams. These results are consistent with analytic theory and three-dimensional simulations and illustrate a key advantage of wakefield systems with Cartesian symmetry: the suppression of transverse wakes by elliptical beams.

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  • Received 14 July 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.164801

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsCondensed Matter, Materials & Applied PhysicsInterdisciplinary PhysicsPlasma Physics

Authors & Affiliations

P. D. Hoang1,*, G. Andonian1, I. Gadjev1, B. Naranjo1, Y. Sakai1, N. Sudar1, O. Williams1, M. Fedurin2, K. Kusche2, C. Swinson2, P. Zhang3, and J. B. Rosenzweig1

  • 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA
  • 2Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China

  • *hoangpd@g.ucla.edu

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Vol. 120, Iss. 16 — 20 April 2018

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