Experimental plan for observation of laser intensity dependent Doppler red shift in Thomson scattering

Nishimori, Nobuyuki; Hajima, Ryoichi; Kando, Masaki; Bulanov, S. V.

Thomson scattering wavelength between a single photon at wavelength and an electron with velocity c is given by in head-on collision configuration. As the incident laser intensity increases, the scattering wavelength is Doppler red shifted and given by . Here a=eA/mc is the dimensionless laser vector potential. The Doppler red shift is very similar to that in an undulator radiation whose wavelength becomes longer as the undulator gap narrows. The intensity dependent Doppler red shift in Thomson scattering has not been experimentally demonstrated yet to our knowledge. This is in contrast to the undulator radiation whose wavelength can easily be tuned for user experiments. In this paper, an experimental plan for observation of laser intensity dependent Doppler red shift in Thomson scattering is presented.