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

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

2010-07-19

arxiv.org/abs/1007.3241v1

Physics

Plasma Physics

Scientific paper

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 multi-megagauss fields, constrained to a transverse dimension comparable to the plasma wavelength and several plasma wavelengths longitudinally. The fields are generated rapidly and move with the driving laser. In our experiment, the appearance of the magnetic fields is correlated to the production of relativistic electrons, indicating that they are inherently tied to the growth and wavebreaking 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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