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SUMMARY:Simulations of laser-driven ion acceleration using the quasi-cylin
drical PIC code CALDER-CIRC and application to the PETAL facility
DTSTART;VALUE=DATE-TIME:20190506T153500Z
DTEND;VALUE=DATE-TIME:20190506T155500Z
DTSTAMP;VALUE=DATE-TIME:20211208T101745Z
UID:indico-contribution-124@indico.physik.uni-muenchen.de
DESCRIPTION:Speakers: Xavier Davoine (CEA\, DAM\, DIF)\nTarget normal shea
th acceleration (TNSA) of ions from laser-irradiated solid foils is a well
-known\, robust and widely used method. Numerical simulation of this proce
ss using PIC codes is\, however\, very challenging. Indeed\, very small sp
ace and time steps are required to resolve the plasma skin depth and plasm
a period at the solid densities considered\, while large spatiotemporal do
mains are needed to capture the full scales of ion acceleration. In additi
on\, the hot electrons’ transverse expansion\, which strongly affects th
e dynamics and spatial distribution of the accelerating sheath field\, can
only be correctly described in a 3D geometry. In particular\, such electr
on dilution is underestimated in 2D geometry\, leading to significant over
estimation of the final ion energy. Despite this limitation\, 2D PIC simul
ations often appear to be the only reasonable option due to the excessive
computational cost of 3D simulations. \nAs an alternative\, we investigate
here the benefit of using the quasi-cylindrical PIC code CALDER-CIRC [1]
to describe TNSA over experimentally relevant scales. This code employs a
field decomposition into a few Fourier modes along the poloidal angle\, th
us enabling reduced 3D simulations at a computational cost close to that o
f 2D Cartesian simulations. This method\, originally developed for laser w
akefield acceleration\, remains valid if the plasma fields retain a quasi-
cylindrical symmetry. To illustrate both its potential and limitations\, w
e will compare simulations of a typical TNSA setup carried out using CALDE
R-CIRC and the 2D and 3D Cartesian versions of CALDER.\nMoreover\, we will
report on a CALDER-CIRC simulation of TNSA under conditions relevant to t
he PW PETAL laser (∼450 J energy\, ∼600 fs pulse duration\, ∼50 μm
focal spot). The effect of the laser prepulse on the relativistic laser in
teraction and the acceleration processes will be analyzed. \n\n[1] A. F.
Lifschitz et al.\, Particle-in-cell modelling of laser-plasma interaction
using Fourier Decomposition\, J. Comp. Phys. 228\, 1803 (2009).\n\nhttps:/
/indico.physik.uni-muenchen.de/event/5/contributions/124/
LOCATION:MedILS Meeting Room
URL:https://indico.physik.uni-muenchen.de/event/5/contributions/124/
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