Speaker
Felipe Barbedo Rizzato
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.2035.pdf
Ponderomotive and resonant effects in the acceleration of particles by
electromagnetic modes in vacuum and plasmas
I. Almansa1 , F. Russman1 , E. Peter1 , S. Marini2 , G. I. de Oliveira3 , R, Pakter1 , F. B. Rizzato1
1 Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
2 LULI, Sorbonne Université, CNRS, École Polytechnique, CEA, Université Paris-Saclay,
Paris, France
3 Instituto de Física, Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brasil
In the present analysis we study the dynamics of charged particles submitted to the action
of slowly modulated relativistic electromagnetic carrier waves, both in vacuum and in plasma
media. Firstly, with the use of a high-frequency laser mode along with a modulated static mag-
netic wiggler, we show that the ensuing total field effectively acts as a slowly modulated high-
frequency beat-wave field typical of inverse free-electron laser schemes. This effective resulting
field is capable to accelerate particles much in the same way as space-charge wake fields do in
plasmas accelerators [1], with the advantage of being more stable than plasma related settings.
Acceleration occurs precisely as particles transition from ponderomotive to resonant regimes,
so we develop the proper ponderomotive formalism to examine the problem. The formalism
includes terms hitherto not discussed in the usual applications of the approximation, but that are
nevertheless of crucial importance in the vicinity of resonant capture. The role of these terms is
then also discussed in the broader context of laser-plasma interactions [2, 3].
References
[1] S. Marini, E. Peter, G. I. Oliveira, and F. B. Rizzato, Physics of Plasmas 24 093113 2017.
[2] D. A. Burton, R. A. Cairns, B. Ersfeld, A. Noble, S. Yoffe, and D. A. Jaroszynski, Observations on the
ponderomotive force, Proc. SPIE 10234, Relativistic Plasma Waves and Particle Beams as Coherent and
Incoherent Radiation Sources II, 102340G doi:10.1117/12.2270542 (2017).
[3] E. Peter, S. Marini, R. Pakter, and F. B. Rizzato, Physics of Plasmas 24 102124 2017.
