Speaker
Natalia Naumova
(LOA, ENSTA ParisTech, CNRS, Ecole polytechnique, Université Paris-Saclay, 91762 Palaiseau, France)
Description
The fields to accelerate charged particles within the framework of the Laser Wake Field Acceleration scheme are created by the charge separation effect in the laser pulsed field. To intensify the field and boost the acceleration rate, one may increase the plasma density (say, toward the solid state density) as long as the charge separation in denser plasmas results in higher fields. However, the use of denser plasma would require shorter laser pulse to produce the wake field wave of a shorter wavelength. That is why we discuss the ways to produce the shorter laser pulse, which, particularly can be achieved with the recently proposed laser pulse compression scheme [1]. The scheme is designed to reach the laser pulse as short as the single wave period (i.e. of duration of about 1 fs) combined with an extremely high focused intensity amounting to 10$^{24}$ W/cm$^2$. Particle-in-cell simulations give us a hint that the further compression toward $\sim$ 1 as durations may be achieved in reflection of such pulses from plasma targets of proper density. In the presentation we will discuss the model related to this pulse compression. It accounts for the effect of phase difference on the wave interference, which poses the important restriction on the pulse compression capability, as long as the waves reflected, for example, from the front and rear sides of a plasma foil, may extend the reflected pulse and/or reduce its amplitude, due to their interference.
[1] G. Mourou, S. Mironov, E. Khazanov, A. Sergeev, Eur. Phys. J. Special Topics 223 (2014) 1181
Author
Natalia Naumova
(LOA, ENSTA ParisTech, CNRS, Ecole polytechnique, Université Paris-Saclay, 91762 Palaiseau, France)
Co-authors
Gerard Mourou
(IZEST, Ecole Polytechnique, 91128 Palaiseau, France)
Igor V. Sokolov
(Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109, USA)
Toshi Tajima
(Department of Physics and Astronomy,University of California, Irvine, CA 92697, USA)
