Redshift and harmonic radiation of nonlinear Laser-Thomson scattering


Redshift and harmonic radiation of nonlinear Laser-Thomson scattering

Krämer, J. M.; Irman, A.; Jochmann, A.; Pausch, R.; Debus, A.; Couperus, J. P.; Köhler, A.; Zarini, O.; Kuntzsch, M.; Budde, M.; Lehnert, U.; Wagner, A.; Bussmann, M.; Cowan, T.; Schramm, U.

Thomson scattering of intense laser pulses from relativistic electrons not only allows for the generation of bright x-ray pulses but also serves as a laboratory for strong field physics and nonlinear interactions. We present high resolution angle and energy resolved characterization of laser-Thomson scattered X-rays generated by colliding picosecond electron bunches from the superconducting ELBE linear accelerator with counter-propagating laser pulses from the 150 TW DRACO Ti:Sapphire laser system.
The measurements quantify the influence of the two major interaction parameters, namely laser intensity and electron beam emittance, on the spectral bandwidth of the scattered photons. We also record and spectrally resolve the increasing redshift of the fundamental of the radiation, the rise of harmonics as well as the gain in total photon flux for increasing laser strength.
Numerical simulations of both studies performed with the classical radiation solver CLARA show good agreement, benchmarking this code with the experiments.

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Permalink: https://www.hzdr.de/publications/Publ-25535
Publ.-Id: 25535