Measurement of Magnetic-Field Structures in a Laser-Wakefield Accelerator

M. C. Kaluza, H.-P. Schlenvoigt, S. P. D. Mangles, A. G. R. Thomas, A. E. Dangor, H. Schwoerer, W. B. Mori, Z. Najmudin, and K. M. Krushelnick
Phys. Rev. Lett. 105, 115002 – Published 7 September 2010


Experimental measurements of magnetic fields generated in the cavity of a self-injecting laser-wakefield accelerator are presented. Faraday rotation is used to determine the existence of multimegagauss fields, constrained to a transverse dimension comparable to the plasma wavelength λp and several λp longitudinally. The fields are generated rapidly and move with the driving laser. In our experiment, the appearance of the magnetic fields is correlated with the production of relativistic electrons, indicating that they are inherently tied to the growth and wave breaking of the nonlinear plasma wave. This evolution is confirmed by numerical simulations, showing that these measurements provide insight into the wakefield evolution with high spatial and temporal resolution.

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  • Received 15 April 2010


© 2010 The American Physical Society

Authors & Affiliations

M. C. Kaluza1,2,3, H.-P. Schlenvoigt1,4, S. P. D. Mangles3, A. G. R. Thomas3,5, A. E. Dangor3, H. Schwoerer1,6, W. B. Mori7,8, Z. Najmudin3, and K. M. Krushelnick3,5

  • 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743 Jena, Germany
  • 2Helmholtz-Institut Jena, Friedrich-Schiller-Universität, 07743 Jena, Germany
  • 3Department of Physics, Imperial College, London SW7 2AZ, United Kingdom
  • 4LULI, École Polytechnique, 91128 Palaiseau cedex, France
  • 5Center for Ultrafast Optical Science (CUOS), University of Michigan, Ann Arbor, Michigan 48109, USA
  • 6Laser Research Institute, Stellenbosch University, Stellenbosch 7600, South Africa
  • 7Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
  • 8Department of Electrical Engineering, UCLA, Los Angeles, California 90095, USA

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Vol. 105, Iss. 11 — 10 September 2010

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January 27, 2017

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