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Generation of a large amount of energetic electrons in complex-structure bubble

Generation of a large amount of energetic electrons in complex-structure bubble,10.1088/1367-2630/12/2/023037,New Journal of Physics,Jiancai Xu,Baifei

Generation of a large amount of energetic electrons in complex-structure bubble  
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By means of particle-in-cell (PIC) simulations, we found that when the focus size of a laser pulse is much larger than the plasma wavelength and when the laser power is hundreds of times larger than the critical power required for relativistic self-focusing, a large complex bubble is formed. The transversal size of the bubble depends on the laser spot size. Owing to the large bubble size, a bunch of electrons with the total charge in the range of a few tens of nano-Coulombs is trapped and accelerated in the bubble. When the plasma density is 2×1019 cm-3, the charge of the energetic electron bunch with energy above 5 MeV exceeds 45 nC with a laser spot size of 60 mum. Electrons continuously self-injected into such a complex bubble serve as an effective source of high-charge electron bunches.
Journal: New Journal of Physics - NEW J PHYS , vol. 12, no. 2, 2010
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