Speaker
Dragos Emilian Tatomirescu
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.2024.pdf
Influence of the peak density of near-critical gas targets on the spectrum
features using ultra-high laser intensity through numerical modeling
D. Tatomirescu1,2, D. Vizman1, E. d'Humières2
1
Faculty of Physics, West University of Timisoara, Bd. V. Parvan 4, 300223 Timisoara,
Romania
2
CELIA, University of Bordeaux – CNRS – CEA, 33405 Talence, France
In the past two decades, laser-accelerated ion sources and their applications have been
intensely researched due to the increased focus in developing potential laser plasma sources
with applications in proton radiography [1], fast ignition [2], hadrontherapy [3], [4],
radioisotope production [5] and laboratory astrophysics [6]. Recently, it has been shown
through experiments that proton beams with characteristics comparable to those obtained
with solid targets can be obtained from gaseous targets. By means of Particle-In-Cell
simulations, this paper studies in detail the effects of a near-critical density gradient on ion
and electron acceleration after the interaction with ultra high intensity lasers. We can observe
the influence of the peak density of the gas jet on the accelerated particle spectrum features.
We can observe that as the gas jet density increases, so does the peak energy of the central
quasi-monoenergetic ion bunch due to the increase in laser absorption while at the same time
having a broadening effect on the electron angular distribution. Furthermore, the gamma
photon production is studied for all cases comprised in the study in order to ascertain the
feasibility of such targets as secondary sources.
References:
[1] M. Borghesi et al., Plasma Phys. Control. Fusion 43, A267 (2001)
[2] M. Roth et al., Phys. Rev. Lett. 86, 436 (2001)
[3] V. Malka et al., Med Phys. 31, 1587 (2004)
[4] S. Bulanov et al., Phys. Lett. A 299, 240(2002)
[5] S. Fritzler et al., Applied Phys. Lett. 83, 3039 (2003)
[6] S. Davis et al., High Energy Density Phys. 9, 231 (2013)
