Resonant phase matching by oblique illumination of a dielectric laser accelerator

Crisp, Sophie; Ody, Alexander; Musumeci, P.; England, J. M.

doi:10.1103/physrevaccelbeams.24.121305

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…This is due to the low Q-factor of the structures used for DLA, so that the fields in the electron beam channel are actually faithful reproductions of the illuminating laser pulses. Therefore, dynamically controlling phase and amplitude of the drive laser actually offers an interesting alternative to soften the tight tolerance requirements on structure fabrication and enable tuning of the accelerator characteristics without the need to modify/manufacture delicate and expensive dielectric structures [44].…”

Section: Soft Tuning Of Dla Parametersmentioning

confidence: 99%

Beam dynamics in dielectric laser acceleration

Niedermayer¹,

Leedle²,

Musumeci³

et al. 2022

J. Inst.

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We discuss recent developments and challenges of beam dynamics in Dielectric Laser Acceleration (DLA), for both high and low energy electron beams. Starting from ultra-low emittance nanotip sources the paper follows the beam path of a tentative DLA light source concept. Acceleration in conjuction with focusing is discussed in the framework of Alternating Phase Focusing (APF) and spatial harmonic ponderomotive focusing. The paper concludes with an outlook to the beam dynamics in laser driven nanophotonic undulators, based on tilted DLA grating structures.

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Section: Soft Tuning Of Dla Parametersmentioning

confidence: 99%

Beam dynamics in dielectric laser acceleration

Niedermayer¹,

Leedle²,

Musumeci³

et al. 2022

J. Inst.

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“…For example, planar membranes and field-enhancing structures enable electron temporal compression at terahertz, mid-infrared, and optical frequencies. ,,, An intrinsic limitation of these schemes is their finite interaction length, which is typically much shorter than one optical wavelength. This issue can be overcome by using a tailored waveguide, , pulse-front tilt, periodic dielectric structures, , or near-infrared evanescent fields in what has been called an inverse Cherenkov scheme. − …”

Section: Focusing Acceleration and Compressionmentioning

confidence: 99%

“…1,10,12,13 An intrinsic limitation of these schemes is their finite interaction length, which is typically much shorter than one optical wavelength. This issue can be overcome by using a tailored waveguide, 54,55 pulse-front tilt, 56 periodic dielectric structures, 57,58 or near-infrared evanescent fields in what has been called an inverse Cherenkov scheme. 20−22 In this section, we show by numerical simulations that the reported velocity-matched electron−terahertz interaction with a prism surface is a nearly all-purpose electron manipulation device that can be used, for example, for efficient electron acceleration, electron pulse compression, or spatial focusing.…”

Section: ■ Streaking and Pulse Reconstructionmentioning

confidence: 99%

Spatiotemporal Attosecond Control of Electron Pulses via Subluminal Terahertz Waveforms

et al. 2022

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Shaping electron beams with cycles of light provides femtosecond and attosecond time resolution in electron microscopy and enables fundamental quantum-coherent measurements. However, efficient light-electron control requires a prolonged interaction between the two beams for cascaded transfer of photon energy and momentum to the freely propagating electrons. Here we report the use of traveling evanescent terahertz waves to achieve velocity matching and thereby high acceleration gradients both in space and in time. With experiment and simulations, we demonstrate attosecond streaking, temporal pulse compression, acceleration, and spatial focusing of subrelativistic electron pulses with a single evanescent-wave element under the control of selected terahertz delays and phases. Based on these results, we propose to use a symmetric arrangement with two evanescent terahertz waves to generate isolated attosecond electron pulses in a beam with realistic parameters. These results establish subluminal terahertz waves as a promising tool for ultrafast electron pulse control.

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Section: Soft Tuning Of Dla Parametersmentioning

confidence: 99%

Challenges in simulating beam dynamics of dielectric laser acceleration

Niedermayer

Adelmann

Bettoni

et al. 2019

Int. J. Mod. Phys. A

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Dielectric Laser Acceleration (DLA) achieves the highest gradients among structure-based electron accelerators. The use of dielectrics increases the breakdown field limit, and thus the achievable gradient, by a factor of at least 10 in comparison to metals. Experimental demonstrations of DLA in 2013 led to the Accelerator on a Chip International Program (ACHIP), funded by the Gordon and Betty Moore Foundation. In ACHIP, our main goal is to build an accelerator on a silicon chip, which can accelerate electrons from below 100 keV to above 1 MeV with a gradient of at least 100 MeV/m. For stable acceleration on the chip, magnet-only focusing techniques are insufficient to compensate the strong acceleration defocusing. Thus, spatial harmonic and Alternating Phase Focusing (APF) laser-based focusing techniques have been developed. We have also developed the simplified symplectic tracking code DLAtrack6D, which makes use of the periodicity and applies only one kick per DLA cell, which is calculated by the Fourier coefficient of the synchronous spatial harmonic. Due to coupling, the Fourier coefficients of neighboring cells are not entirely independent and a field flatness optimization (similarly as in multi-cell cavities) needs to be performed. The simulation of the entire accelerator on a chip by a Particle In Cell (PIC) code is possible, but impractical for optimization purposes. Finally, we have also outlined the treatment of wake field effects in attosecond bunches in the grating within DLAtrack6D, where the wake function is computed by an external solver.

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Resonant phase matching by oblique illumination of a dielectric laser accelerator

Cited by 6 publications

References 29 publications

Beam dynamics in dielectric laser acceleration

Beam dynamics in dielectric laser acceleration

Spatiotemporal Attosecond Control of Electron Pulses via Subluminal Terahertz Waveforms

Challenges in simulating beam dynamics of dielectric laser acceleration

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