Dephasingless Laser Wakefield Acceleration

Palastro, J. P.; Shaw, J. L.; Franke, P.; Ramsey, D.; Simpson, T. T.; Froula, D. H.

doi:10.1103/PhysRevLett.124.134802

Title: Dephasingless Laser Wakefield Acceleration

Journal Article · 31 March 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.124.134802 · OSTI ID:1618301

Palastro, J. P. ^[1]; Shaw, J. L. ^[2]; Franke, P. ^[2]; Ramsey, D. ^[2]; Simpson, T. T. ^[2]; Froula, D. H. ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Laser wakefield accelerators (LWFAs) produce significantly high gradients enabling compact accelerators and radiation sources, but face design limitations, such as dephasing, occurring when trapped electrons outrun the accelerating phase of the wakefield. In this report we combine spherical aberration with a novel cylindrically symmetric echelon optic to spatiotemporally structure an ultra-short, high-intensity laser pulse that can overcome dephasing by propagating at any velocity over any distance. The ponderomotive force of the spatiotemporally shaped pulse can drive a wakefield with a phase velocity equal to the speed of light in vacuum, preventing trapped electrons from outrunning the wake. Simulations in the linear regime and scaling laws in the bubble regime illustrate that this dephasingless LWFA can accelerate electrons to high energies in much shorter distances than a traditional LWFA—a single 4.5 m stage can accelerate electrons to TeV energies without the need for guiding structures.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: NA0003856; SC0016253

OSTI ID:: 1618301

Report Number(s):: 2019-306; 1563; 2519; 2019-306, 1563, 2519

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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