Abstract

Laser wakefield accelerators operating in the blowout regime exhibit unique forward scattering characteristics. When a cavitation region is formed, the drive pulse excites currents in the electron sheath that lead to conical emission of harmonic radiation in the near-forward direction. Theoretical expressions for the spectral-angular distribution in the far field are derived. These expressions allow for arbitrary temporal profiles of both the laser pulse and the sheath density. The characteristics of the emission can be related to key characteristics of the accelerating structure. The theoretical results are compared with the results of the experiment.

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