Speaker
Stefan Borodziuk
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.2027.pdf
Alternative efficient methods of dense plasma acceleration to high velocities
S. Borodziuk1, K. Jach2, R. Swierczynski2, T. Pisarczyk1, T. Chodukowski1, Z. Kalinowska1,
R. Dudzak3,4, J. Dostal3,4, M. Krus3,4,
1
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
2
Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
3
Institute of Physics, Czech Academy of Sciences, 182 21 Prague, Czech Republic
3
Institute of Plasma Physics, Czech Academy of Sciences, 182 21 Prague, Czech Republic
Abstract
Numerical modelling of dense plasma acceleration processes was performed. In these
investigations a scheme called “cavity pressure acceleration” (CPA) was applied, which
allows driving propelling plasma objects in arbitrary direction in relation to the laser beam
incident on a target and more efficient absorption of the laser pulse energy. Two different
versions of these “non-classic” CPA schemes were taken into account: “backward
acceleration” and “forward acceleration”.
Those calculations complement the previously performed experiments on the PALS system,
in which the results of acceleration of dense plasma objects (average speed obtained for
20 m PS and 10m Al targets was ~ 6x107 cm/s) were at the level of the top global results.
Numerical calculations were made for two different laser wavelengths: = 1.315 m (iodine
laser) and = 0,248 m (KrF laser). For the “classic” i.e. ablative drive scheme, the
advantage of using a short laser wavelength is obvious. Velocities obtained in this variant are
two- three times higher than in the case of using a laser with several times longer wavelength.
This also applies to other important parameters of the acceleration experiment, such as
pressures generated and the amount of neutrons produced (when using appropriate targets).
Completed numerical calculations, as well as the previous experiments on the PALS system,
show that the use of non-classical drive schemes enables comparable, very good results to be
obtained also with lasers of longer wavelength.
