Speaker
Sophia Malko
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O2.203.pdf
Enhanced relativistic electron beam collimation using two consecutive
laser pulses
Sophia Malko1
, Xavier Vaisseau1
, Michael Ehret2, 3
, Dimitri Batani2
, Alessandro Curcio4
,
J.J. Honrubia5
, Katarzyna Jakubowska2
, Alessio Morace6
, Frédéric Perez7
, Joao Santos2
,
and Luca Volpe1, 8
1 CLPU (Centro de Láseres Pulsados), Spain
2 Univ. Bordeaux, CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), France
3
Institut für Kernephysik, Technical University of Darmstadt, Germany
4
INFN, Laboratori Nazionali di Frascati, Italy
5
ETSI Aeronauticos, Universidad Politecnica de Madrid, Madrid, Spain
6
LULI (Laboratoire pour l’Utilisation des Lasers Intenses), Ecole Polytechnique, France
7
Institute of Laser Engineering, Osaka University, Japan
8University of Salamanca, Spain
Here we report an experimental investigation of a scheme based on using of two consecutive
intense laser pulses in order to optimize electron transport and collimation in dense matter.
The two laser pulses, of different intensities, are focalized in a solid target at a given delay to
generate two successive co-axial electron populations, where the azimuthal magnetic field
generated by the first electron beam can guide the second one [1]. Previous experimental
results have confirmed the general validity of the scheme: optimum delay time and intensity
ratio yielding the best guiding effect [2]. It was shown that the ratio between the pre-formed
magnetic field extension and the diameter of the second electron beam plays a major role in
determining the guiding efficiency [3]. A systematic investigation of the scheme, exploring
the role played by the radial extension of the seed magnetic field and the delay time between
seed and main laser pulses, was recently carried out on the LULI-ELFIE facility. The
experimental results showed a reduction of the electron beam size in the optimum conditions
of both focal spot ratio and delay time between the first and the second laser pulses, yielding
in factor of 2. In addition, we present the numerical simulations using hybrid PIC code and
kinetic transport code that reproduce performed experimental parametrical study and
benchmark the scheme efficiency.
References
[1] A.P.L. Robinson, et al., Phys. Rev. Lett. 100, 025002 (2008)
[2] R.H.H. Scott, et al. Phys. Rev. Lett. 109, 015001 (2012)
[3] L. Volpe, et al., Phys. Rev. E. 90, 063108 (2014)
