Multi-GeV Electron Bunches from an All-Optical Laser Wakefield Accelerator,Physical Review X

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Multi-GeV Electron Bunches from an All-Optical Laser Wakefield Accelerator
Physical Review X ( IF 11.6 ) Pub Date : 2022-09-16 , DOI: 10.1103/physrevx.12.031038
B. Miao , J. E. Shrock , L. Feder , R. C. Hollinger , J. Morrison , R. Nedbailo , A. Picksley , H. Song , S. Wang , J. J. Rocca , H. M. Milchberg

We present the first demonstration of multi-GeV laser wakefield acceleration in a fully optically formed plasma waveguide, with an acceleration gradient as high as

25 GeV / m

. The guide was formed via self-waveguiding of

< 15 J

, 45 fs (

< \sim 300 TW

) pulses over 20 cm in a low-density hydrogen gas jet, with accelerated electron bunches driven up to 5 GeV in quasimonoenergetic peaks of relative energy width as narrow as

\sim 15 %

, with divergence down to

\sim 1 mrad

and charge up to tens of picocoulombs. Energy gain is inversely correlated with on-axis waveguide density in the range

N_{e 0} = (1.3 - 3.2) \times 10^{17} {cm}^{- 3}

. We find that shot-to-shot stability of bunch spectra and charge are strongly dependent on the pointing of the injected laser pulse and gas jet uniformity. We also observe evidence of pump depletion-induced dephasing, a consequence of the long optical guiding distance.

更新日期：2022-09-17

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