Resonant phase matching by oblique illumination of a dielectric laser accelerator

Crisp, S.; Ody, A.; Musumeci, P.; England, R. J.

doi:10.1103/PhysRevAccelBeams.24.121305

Title: Resonant phase matching by oblique illumination of a dielectric laser accelerator

Journal Article · Tue Dec 21 00:00:00 EST 2021 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.121305· OSTI ID:1836865

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In dielectric laser-driven accelerators (DLA), careful tuning of drive-laser wavelength and structure periodicity is typically required in order to hit the resonant condition and match the phase velocity of the accelerating wave to the electron beam velocity. By aggressively detuning (up to 30 mrad) the angle of incidence of the drive laser on a double grating DLA structure, we show that it is possible to recover resonant phase matching and maximize the energy modulation of an externally injected 6 MeV beam in an 800 nm period structure driven using a 780 nm laser. These results show that it is possible to power DLA structures away from their design working point, and excite accelerating fields in the gap with phase profiles that change by a relatively large amount period-to-period. This flexibility is a key feature of DLAs and a critical element in the realization of phase modulation–based ponderomotive focusing to demonstrate MeV energy gain and large capture in a single DLA stage.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; Gordon and Betty Moore Foundation; National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515; GBMF4744; DGE-1650604

OSTI ID:: 1836865

Alternate ID(s):: OSTI ID: 1865367

Journal Information:: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 24 Journal Issue: 12; ISSN 2469-9888

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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