Acceleration of relativistic beams using laser-generated terahertz pulses

Hibberd, M. T.; Healy, Alisa; Lake, D. S.; Georgiadis, Vasileios; Smith, Elizabeth; Finlay, Oliver; Pacey, Thomas; Jones, James; Saveliev, Yuri; Walsh, D.; Snedden, Edward W.; Appleby, R. B.; Burt, Graeme; Graham, D. M.; Jamison, S. P.

doi:10.1038/s41566-020-0674-1

Cited by 100 publications

(30 citation statements)

References 32 publications

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“…Photoconductive antennas are promising sources of THz radiation due to their compactness, relatively high power, and narrow directivity of the output radiation [ 19 ]. Moreover, LAPCAs are unique sources of quasi half-cycle (unipolar) THz pulses covering the lower part of the THz spectrum ranging from 0.1 to 1 THz suitable for experiments on the acceleration of charged particles and electrons [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Perovskite Terahertz Photoconductive Antenna

et al. 2021

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Hybrid organic–inorganic perovskites, while well examined for photovoltaic applications, remain almost completely unexplored in the terahertz (THz) range. These low-cost hybrid materials are extremely attractive for THz applications because their optoelectronic properties can be chemically engineered with relative ease. Here, we experimentally demonstrate the first attempt to apply solution-processed polycrystalline films of hybrid perovskites for the development of photoconductive terahertz emitters. By using the widely studied methylammonium-based perovskites MAPbI3 and MAPbBr3, we fabricate and characterize large-aperture photoconductive antennas. The work presented here examines polycrystalline perovskite films excited both above and below the bandgap, as well as the scaling of THz emission with the applied bias field and the optical excitation fluence. The combination of ultrafast time-resolved spectroscopy and terahertz emission experiments allows us to determine the still-debated room temperature carrier lifetime and mobility of charge carriers in halide perovskites using an alternative noninvasive method. Our results demonstrate the applicability of hybrid perovskites for the development of scalable THz photoconductive devices, making these materials competitive with conventional semiconductors for THz emission.

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Section: Introductionmentioning

confidence: 99%

Hybrid Perovskite Terahertz Photoconductive Antenna

et al. 2021

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“…The latter are actively developed due to unique properties of THz radiation having large amount of prospective application connected with precise manipulating and probing the state of the matter [6]. Moreover, these technologies penetrate to beam physics: strong THz fields allow realization of THz driven electron guns [7], performing THz bunch compression, streaking [8,9] and wakefield acceleration within THz driven dielectric-lined * s.galyamin@spbu.ru waveguide structures [10,11]. Inversely, beam technologies contribute to THz ones: dielectric capillaries similar to those used for the THz bunch manipulation can be in turn utilized for development of high-power narrow-band THz sources [12,13].…”

Section: Introductionmentioning

confidence: 99%

Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide: Rigorous Approach

Galyamin

Vorobev

Tyukhtin

2021

IEEE Trans. Microwave Theory Techn.

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A rigorous approach for solving canonical circular open-ended dielectric-lined waveguide diffraction problems is presented. This is continuation of our recent paper [1] where a simpler case of uniform dielectric filling has been considered. Here we deal with the case of an open-ended circular waveguide with layered dielectric filling which is closer to potential applications. The presented method uses the solution of corresponding Wiener-Hopf-Fock equation and leads to an infinite linear system for reflection coefficients (S-parameters) of the waveguide, the latter can be efficiently solved numerically using the reducing technique. As a specific example directly applicable to beam-driven radiation sources based on dielectric-lined capillaries, diffraction of a slow TM symmetrical mode at the open end of the described waveguide is considered. A series of such modes forms the wakefield (Cherenkov radiation field) generated by a charged particle bunch during its passage along the vacuum channel axis. Calculated S-parameters were compared with those obtained from COMSOL simulation and an excellent agreement was shown. This method is expected to be very convenient for analytical investigation of various electromagnetic interactions of Terahertz (THz) waves (both free and guided) and charged particle bunches with slow-wave structures prospective in context of modern beam-driven THz emitters, THz accererators and THz-based bunch manipulation and bunch diagnostic systems.

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“…These pulses can also be used to accelerate charged particles, and in this case the acceleration is similar to that in classical structures. Work in this direction is currently being conducted in many laboratories, such as SLAC and CERN [16,17]. However, the problem of efficient generation of narrow-band pulses with a sufficiently high field amplitude is still to be solved.…”

Section: Introductionmentioning

confidence: 99%

Focusing Waveguide Structure for High-Gradient Electron Acceleration by Picosecond Terahertz Pulses

Bodrov

Vikharev

Kuzikov

et al. 2021

Radiophys Quantum El

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We propose an ultra-wideband metal-dielectric structure for high-gradient acceleration of electrons by the field of an ultrashort terahertz pulse. The structure effectively focuses the terahertz beam into the electron channel and accelerates particles under synchronism with the terahertz field. The simulations show that when using terahertz pulses obtained by conversion of laser radiation in a nonlinear crystal and having an energy of 2 μJ and a duration of about 0.5 ps of a positive electric-field polarity, the electron energy can be increased from 50 to 55.7 keV in the structure with a length of 1 mm. A scheme for a demonstration experiment is proposed, assuming that electrons are accelerated to an initial energy of 50 keV by a needle photocathode irradiated by the same laser that produces accelerating terahertz pulses.

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Acceleration of relativistic beams using laser-generated terahertz pulses

Cited by 100 publications

References 32 publications

Hybrid Perovskite Terahertz Photoconductive Antenna

Hybrid Perovskite Terahertz Photoconductive Antenna

Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide: Rigorous Approach

Focusing Waveguide Structure for High-Gradient Electron Acceleration by Picosecond Terahertz Pulses

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