Photon acceleration by laser wakefields

C.D. Murphy, R. M. G. M. Trines, Robert Bingham, K. Lancaster, O. Chekhlov, P. Norreys, Jose Tito Mendonca, L.O. Silva, S.P.D. Mangles, C. Kamperidis, A Thomas, K. Krushelnick, Z. Najmudin

Research output: Contribution to conferenceAbstractpeer-review

Abstract

In recent times, theory and simulation have been able to reproduce photon acceleration from wakefields where light is up- shifted in frequency by a moving refractive index gradient. The effect has been considered as a possible method of diagnosis of a wakefield such as the one postulated for a compact electron accelerator. Here we present further observations of spectral modulation caused by a laser-produced wakefield. In our experiments, the Astra laser at the Rutherford Appleton Laboratory was focused into jet of helium. Between 300mJ and 600mJ of laser energy was delivered into a 25 micron focal spot in pulses between 50fs and 200fs. The spectrum of the transmitted light was measured. The lower intensity laser pulse allowed a linear regime to be investigated. A photon kinetic code has been implemented to model the experiment. The feasibility of using this effect as a wakefield diagnostic will be discussed.
Original languageEnglish
Publication statusPublished - Oct 2006
Event2006 48th Annual Meeting of the Division of Plasma Physics - Philadelphia, United States
Duration: 31 Oct 200631 Oct 2006

Conference

Conference2006 48th Annual Meeting of the Division of Plasma Physics
CountryUnited States
CityPhiladelphia
Period31/10/0631/10/06

Keywords

  • photon acceleration
  • laser wakefields

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