Experimental evidence of radiation reaction in the collision of a high-intensity laser pulse with a laser-wakefield accelerated electron beam

J. M. Cole, K. T. Behm, E Gerstmayr, T. G Blackburn,, J. C. Wood, C. D. Baird, M. J. Duff, C. Harvey, A. Ilderton, A. S. Joglekar,, K. Krushelnick, S. Kuschel, M. Marklund, P. McKenna, C. D. Murphy, K. Poder, C. P. Ridgers, G. M. Samarin, Gianluca Sarri, D. R. SymesA. G. R. Thomas, J. Warwick, M. Zepf, Z. Najmudin, S. P. D. Mangles

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Abstract

The dynamics of energetic particles in strong electromagnetic fields can be heavily influenced by the energy loss arising from the emission of radiation during acceleration, known as radiation reaction. When interacting with a high-energy electron beam, today's lasers are sufficiently intense to explore the transition between the classical and quantum radiation reaction regimes. \Update{We present evidence of radiation reaction} in the collision of an ultra-relativistic electron beam generated by laser wakefield acceleration (\varepsilon greater than 500~MeV) with an intense laser pulse (a_0 greater than 10). We measure an energy loss in the post-collision electron spectrum that is correlated with the detected signal of hard photons (\gamma-rays), consistent with a \Update{quantum} description of radiation reaction. The generated \gamma-rays have the highest energies yet reported from an all-optical inverse Compton scattering scheme, with critical energy \varepsilon\rm crit greater than ~30~MeV.
Original languageEnglish
Pages (from-to)1-11
JournalPhysical review x
Volume8
DOIs
Publication statusPublished - 07 Feb 2018

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