Encontrados 7 documentos, a visualizar página 1 de 1
Ion acceleration from laser-driven electrostatic shocks
Fiuza, F.; Stockem, A.; Boella, E.; Fonseca, R. A.; Silva, L. O.; Haberberger, D.; Tochitsky, S.; Mori, W. B.; Joshi, C.WOS:000320000000092 (Nº de Acesso Web of Science) ; Multi-dimensional particle-in-cell simulations are used to study the generation of electrostatic shocks in plasma and the reflection of background ions to produce high-quality and high-energy ion beams. Electrostatic shocks are driven by the interaction of two plasmas with different density and/or relative drift velocity. The energy and number of ions reflect...
Magnetically assisted self-injection and radiation generation for plasma-based ...
Vieira, J.; Martins, J. L.; Pathak, V. B.; Fonseca, R. A.; Mori, W. B.; Silva, L. O.WOS:000312579500047 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2013” ; It is shown through analytical modeling and numerical simulations that external magnetic fields can relax the self-trapping thresholds in plasma-based accelerators. In addition, the transverse location where self-trapping occurs can be selected by adequate choice of the spatial profile of the external magnetic field. We a...
Weibel-Instability-Mediated Collisionless Shocks in the Laboratory with Ultrain...
Fiuza, F.; Fonseca, R. A.; Tonge, J. W.; Mori, W. B.; Silva, L. O.WOS:000305032100015 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2013” ; The formation of nonrelativistic collisionless shocks in the laboratory with ultrahigh intensity lasers is studied via ab initio multidimensional particle-in-cell simulations. The microphysics behind shock formation and dissipation and the detailed shock structure are analyzed, illustrating that the Weibel instability pla...
Laser-Driven Shock Acceleration of Monoenergetic Ion Beams
Fiuza, F.; Stockem, A.; Boella, E.; Fonseca, R. A.; Silva, L. O.; Haberberger, D.; Tochitsky, S.; Gong, C.; Mori, W. B.; Joshi, C.WOS:000311284200008 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2013” ; We show that monoenergetic ion beams can be accelerated by moderate Mach number collisionless, electrostatic shocks propagating in a long scale-length exponentially decaying plasma profile. Strong plasma heating and density steepening produced by an intense laser pulse near the critical density can launch such shocks that...
Ion Motion in Self-Modulated Plasma Wakefield Accelerators
Vieira, J.; Fonseca, R. A.; Mori, W. B.; Silva, L. O.WOS:000309589600007 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2013” ; The effects of plasma ion motion in self-modulated plasma-based accelerators are examined. An analytical model describing ion motion in the narrow beam limit is developed and confirmed through multidimensional particle-in-cell simulations. It is shown that the ion motion can lead to the early saturation of the self-modula...
Magnetic Control of Particle Injection in Plasma Based Accelerators
Vieira, J.; Martins, S. F.; Pathak, V. B.; Fonseca, R. A.; Mori, W. B.; Silva, L.O.WOS:000291093600006 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2012” ; The use of an external transverse magnetic field to trigger and to control electron self-injection in laser- and particle-beam driven wakefield accelerators is examined analytically and through full-scale particle-in-cell simulations. A magnetic field can relax the injection threshold and can be used to control main outpu...
Modeling laser wakefield accelerator experiments with ultrafast particle-in-cel...
Martins, S. F.; Fonseca, R. A.; Vieira, J.; Silva, L. O.; Lu, W.; Mori, W. B.WOS:000278182900137 (Nº de Acesso Web of Science) ; “Prémio Científico ISCTE-IUL 2011” ; The development of new laser systems at the 10 Petawatt range will push laser wakefield accelerators to novel regimes, for which theoretical scalings predict the possibility to accelerate electron bunches up to tens of GeVs in meter-scale plasmas. Numerical simulations will play a crucial role in testing, probing, and opt...
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