Additional acceleration and collimation of relativistic electron beams by magnetic field resonance at very high intensity laser interaction |
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Authors: | H Liu XT He H Hora |
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Institution: | (1) Basic Department, Beijing Materials Institute, Beijing, 101149, P.R. China;(2) Institute of Applied Physics and Computational Mathematics, 8009, Beijing, 100088, P.R. China;(3) Department of Physics, Zhejiang University, Hangzhou, 310027, P.R. China;(4) Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Science, Beijing, 100080, P.R. China;(5) Department of Theoretical Physics, University of New South Wales, Sydney, 2052, Australia |
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Abstract: | For the interpretation of experiments for acceleration of electrons at interaction up to nearly GeV energy in laser produced
plasmas, we present a new model using interaction magnetic fields. In addition to the ponderomotive acceleration of highly
relativistic electrons at the interaction of very short and very intense laser pulses, a further acceleration is derived from
the interaction of these electron beams with the spontaneous magnetic fields of about 100 MG. This additional acceleration
is the result of a laser-magnetic resonance acceleration (LMRA) around the peak of the azimuthal magnetic field. This causes
the electrons to gain energy within a laser period. Using a Gaussian laser pulse, the LMRA acceleration of the electrons depends
on the laser polarization. Since this is in the resonance regime, the strong magnetic fields affect the electron acceleration
considerably. The mechanism results in good collimated high energetic electrons propagating along the center axis of the laser
beam as has been observed by experiments and is reproduced by our numerical simulations.
PACS 41.75.Jv; 52.38.Kd; 52.65.Cc |
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