Measurements of the Inverse Faraday Effect from Relativistic Laser Interactions with an Underdense Plasma
- Najmudin, Z.
- Tatarakis, M.
- Pukhov, A.
- Clark, E. L.
- Clarke, R.J.
- Dangor, A.E.
- Faure, Jérôme
- Malka, Victor
- Neely, D.
- Santala, M. I. K.
- Krushelnick, K.
Publication date
November 2001
DOI Publisher
American Physical Society (APS)Abstract
International audienceMagnetic fields in excess of 7 MG have been measured with high spatial and temporal precision during interactions of a circularly polarized laser pulse with an underdense helium plasma at intensities up to 1×10^19Wcm^-2. The fields, while of the form expected from the inverse Faraday effect for a cold plasma, are much larger than expected, and have a duration approaching that of the high intensity laser pulse ( <3psec). These observations can be explained by particle-in-cell simulations in 3D. The simulations show that the magnetic field is generated by fast electrons which spiral around the axis of the channel created by the laser field
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