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Title:
Signatures of quantum effects on radiation reaction in laser-electron-beam collisions
Authors:
Ridgers, C. P.; Blackburn, T. G.; Del Sorbo, D.; Bradley, L. E.; Slade-Lowther, C.; Baird, C. D.; Mangles, S. P. D.; McKenna, P.; Marklund, M.; Murphy, C. D.; Thomas, A. G. R.
Affiliation:
AA(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AB(Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden), AC(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AD(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AE(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AF(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AG(The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, South Kensington, London  SW7 2BZ, UK), AH(Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, UK), AI(Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden), AJ(York Plasma Institute, Department of Physics, University of York, Heslington, York YO10 5DD, UK), AK(Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109-2099, USA)
Publication:
Journal of Plasma Physics, Volume 83, Issue 5, article id. 715830502, 17 pp.
Publication Date:
10/2017
Origin:
CUP
Keywords:
intense particle beams, plasma dynamics, plasma simulation,
Abstract Copyright:
(c) 2017: © Cambridge University Press 2017 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI:
10.1017/S0022377817000642
Bibliographic Code:
2017JPlPh..83e7102R

Abstract

Two signatures of quantum effects on radiation reaction in the collision of a GeV electron beam with a high intensity ( }3\times 1020~\text{W}~\text{cm}-2$ ) laser pulse have been considered. We show that the decrease in the average energy of the electron beam may be used to measure the Gaunt factor for synchrotron emission. We derive an equation for the evolution of the variance in the energy of the electron beam in the quantum regime, i.e. quantum efficiency parameter . We show that the evolution of the variance may be used as a direct measure of the quantum stochasticity of the radiation reaction and determine the parameter regime where this is observable. For example, stochastic emission results in a 25 % increase in the standard deviation of the energy spectrum of a GeV electron beam, 1 fs after it collides with a laser pulse of intensity 21~\text{W}~\text{cm}-2$ . This effect should therefore be measurable using current high-intensity laser systems.
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