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Phys. Rev. Lett. 96, 054802 (2006) [4 pages]

Observation of the Second Harmonic in Thomson Scattering from Relativistic Electrons

Marcus Babzien, Ilan Ben-Zvi, Karl Kusche, Igor V. Pavlishin, Igor V. Pogorelsky, David P. Siddons, and Vitaly Yakimenko
Brookhaven National Laboratory, Upton, New York 11973, USA

David Cline and Feng Zhou
University of California at Los Angeles, Los Angeles, California 90095, USA

Tachishige Hirose
Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan

Yoshio Kamiya and Tetsuro Kumita
Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

Tsunehiko Omori, Junji Urakawa, and Kaoru Yokoya
High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
Received 24 May 2005; published 8 February 2006

A free relativistic electron in an electromagnetic field is a pure case of a light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with electron beams produced from particle accelerators. The process of single photon absorption and reemission by the electron, so-called linear Thomson scattering, results in radiation that is Doppler shifted into the x-ray and gamma-ray regions. At elevated laser intensity, nonlinear effects should come into play when the transverse motion of the electrons induced by the laser beam is relativistic. In the present experiment, we achieved this condition and characterized the second harmonic of Thomson x-ray scattering using the counterpropagation of a 60 MeV electron beam and a subterawatt CO2 laser beam.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.054802
DOI: 10.1103/PhysRevLett.96.054802
PACS: 41.50.+h; 41.75.Ht; 42.55.Lt
  • 41.50.+h
    X-ray beams and X-ray optics
  • 41.75.Ht
    Relativistic electron and positron beams
  • 42.55.Lt
    Gas lasers including excimer and metal-vapor lasers
  • YEAR: 2006
KEYWORDS: Doppler shift, Thomson effect, electrodynamics, X-ray scattering, relativistic electron beams, laser beam effects

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