Particle-in-cell simulations of optical injectors for plasma accelerators

Gordon, Daniel; Ting, A.; Jones, Thomas B.; Hafizi, B.; Hubbard, R. F.; Sprangle, P.

doi:10.1109/pac.2003.1288695

Cited by 4 publications

(4 citation statements)

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“…Typically, bunch lengths on the order of picoseconds are commonly produced in L-and S-bands RF guns. Shortening these bunches or producing trains of sub-ps microbunches is appealing to a variety of applications including ultra-fast electron diffraction [64,65], coherent accelerator-based, e.g., THz light sources [66,67], and injectors for short-wavelength advanced-accelerator concepts [68,69].…”

Section: Introductionmentioning

confidence: 99%

Beam manipulation and acceleration with Dielectric-Lined Waveguides

Lémery¹

2015

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The development of next-generation TeV+ electron accelerators will require either immense footprints based on conventional acceleraton techniques or the development of new higher-gradient acceleration methods. One possible alternative is beam-driven acceleration in a high-impedance medium such as a dielectric-lined-waveguide (DLW), where a highcharge bunch passes through a DLW and can excite gradients on the order of GV/m. An important characteristic of this acceleration class is the transformer ratio which characterizes the energy transfer of the scheme. This dissertation discusses alternative methods to improve the transformer ratio for beam-driven acceleration and also considers the use of DLWs for beam manipulation at low energy.

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Section: Introductionmentioning

confidence: 99%

Beam manipulation and acceleration with Dielectric-Lined Waveguides

Lémery¹

2015

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“…Typically, bunch lengths on the order of picoseconds are commonly produced in L-and S-bands RF guns. Shortening these bunches or producing trains of sub-ps microbunches is appealing to a variety of applications including ultra-fast electron diffraction [1,2], coherent accelerator-based, e.g., THz light sources [3,4], and injectors for short-wavelength advanced-accelerator concepts [5,6].…”

Section: Introductionmentioning

confidence: 99%

Ballistic bunching of photoinjected electron bunches with dielectric-lined waveguides

Lémery

Piot

2014

Phys. Rev. ST Accel. Beams

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We describe a simple technique to passively bunch non-ultra-relativistic (≲10 MeV) electron bunches produced in conventional photoinjectors. The scheme employs a dielectric-lined waveguide located downstream of the electron source to impress an energy modulation on a picosecond bunch. The energy modulation is then converted into a density modulation via ballistic bunching. The method is shown to support the generation of subpicosecond bunch trains with multi-kA peak currents. The relatively simple technique is expected to find applications in compact, accelerator-based, light sources and advanced beam-driven accelerator methods.

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“…There are several, all-optical electron injection concepts that are theoretically capable of producing such ideal electron bunches. These include laser injector laser accelerator (LILAC) [21], colliding pulse (CP) [22], and laser ionization and ponderomotive acceleration (LIPA) [23], [24]. These schemes have proven to be difficult in practice due to complexity, timing, and alignment issues, and phased, monoenergetic injection has not yet been demonstrated experimentally.…”

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confidence: 99%

“…Again, with proper choice of parameters, a fraction of the injected electrons can be trapped and accelerated to high energies, producing a quasi-monoenergetic beam bunch [30]. This has important implications for near term experiments since several all-optical injection schemes, including high-density LIPA (HD-LIPA) [31], [32], SM-LWFA injectors [24], [33], and laser-wire injectors [30], have been demonstrated experimentally but produce nonideal electron bunches with large energy spreads.…”

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Trapping and acceleration of nonideal injected electron bunches in laser Wakefield accelerators

Hubbard

Gordon

Cooley

et al. 2005

IEEE Trans. Plasma Sci.

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Most conceptual designs for future laser wakefield accelerators (LWFA) require external injection of precisely-phased, monoenergetic, ultrashort bunches of MeV electrons. This paper reports simulation and Hamiltonian models of several nonideal injection schemes that demonstrate strong phase bunching and good accelerated beam quality in a channel-guided LWFA. For the case of monoenergetic, unphased (long bunch) injection, there is an optimum range of injection energies for which the LWFA can trap a significant fraction of the injected pulse while producing an ultrashort, high-quality accelerated pulse. These favorable results are due to a combination of pruning of particles at unfavorable phases, rapid acceleration, and strong phase bunching. Also, the plasma channel introduces a favorable shift in the region of accelerating phase where electrons are focused, which can significantly reduce the required injection energy. Simulation results agree well with the predictions of the Hamiltonian model. Simulations of phased injection with a broad injected energy spread also exhibit final accelerated bunches with small energy spread. These results suggest that relatively poor quality injection pulses may still be useful in LWFA demonstration experiments.

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Particle-in-cell simulations of optical injectors for plasma accelerators

Cited by 4 publications

References 0 publications

Beam manipulation and acceleration with Dielectric-Lined Waveguides

Beam manipulation and acceleration with Dielectric-Lined Waveguides

Ballistic bunching of photoinjected electron bunches with dielectric-lined waveguides

Trapping and acceleration of nonideal injected electron bunches in laser Wakefield accelerators

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