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title: Observation of redshifting and harmonic radiation in inverse Compton scattering
format: journal article
year: 2015
21 authors: Y. Sakai | I. Pogorelsky | O. Williams | F.H. O'Shea | S. Barber | I. Gadjev | J. Duris | P. Musumeci | M. Fedurin | A. Korostyshevsky | B. Malone | C. Swinson | G. Stenby | K. Kusche | M. Babzien | M. Montemagno | P. Jacob | Z. Zhong | M. Polyanskiy | V. Yakimenko | J.B. Rosenzweig
abstract: Inverse Compton scattering of laser photons by ultrarelativistic electron beam provides polarized x- to γ-ray pulses due to the Doppler blueshifting. Nonlinear electrodynamics in the relativistically intense linearly polarized laser field changes the radiation kinetics established during the Compton interaction. These are due to the induced figure-8 motion, which introduces an overall redshift in the radiation spectrum, with the concomitant emission of higher order harmonics. To experimentally analyze the strong field physics associated with the nonlinear electron-laser interaction, clear modifications to the angular and wavelength distributions of x rays are observed. The relativistic photon wave field is provided by the ps CO2 laser of peak normalized vector potential of 0.5
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