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Long-range attraction of an ultrarelativistic electron beam by a column of neutral plasma

Abstract : We report on the experimental observation of the attraction of a beam of ultrarelativistic electrons towards a column of neutral plasma. In experiments performed at the FACET test facility at SLAC we observe that an electron beam moving parallel to a neutral plasma column, at an initial distance of many plasma column radii, is attracted into the column. Once the beam enters the plasma it drives a plasma wake similar to that of an electron beam entering the plasma column head-on. A simple analytical model is developed in order to capture the essential physics of the attractive force. The attraction is further studied by 3D particle-in-cell numerical simulations. The results are an important step towards better understanding of particle beam–plasma interactions in general and plasma wakefield accelerator technology in particular.
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Submitted on : Tuesday, October 10, 2017 - 2:11:11 PM
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E. Adli, C Lindstrøm, J Allen, C. Clarke, J. Frederico, et al.. Long-range attraction of an ultrarelativistic electron beam by a column of neutral plasma. New Journal of Physics, Institute of Physics: Open Access Journals, 2016, 18 (10), pp.103013 - 103013. ⟨10.1088/1367-2630/18/10/103013⟩. ⟨hal-01612782⟩



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