D-D nuclear fusion processes induced in polyethylene foams by TW Laser-generated plasma

¹ Department of Physics and Earth Science, V.le S. d’Alcontres 31, 98166 S. Agata ( ME), Italy
² Institute of Nuclear Physics, ASCR-Rez, Czech Republic
³ Institute of Plasma Physics ASCR, 18200 Prague 8, Czech Republic

^a Corresponding Author: Lorenzo.Torrisi@unime.it

Published online: 2 June 2015

Abstract

Deuterium-Deuterium fusion processes were generated by focusing the 3 TW PALS Laser on solid deuterated polyethylene targets placed in vacuum. Deuterium ion acceleration of the order of 4 MeV was obtained using laser irradiance Iλ² ∼ 5 × 10¹⁶ W μm²/cm² on the target. Thin and thick targets, at low and high density, were irradiated and plasma properties were monitored “on line” and “off line”. The ion emission from plasma was monitored with Thomson Parabola Spectrometer, track detectors and ion collectors. Fast semiconductor detectors based on SiC and fast plastic scintillators, both employed in time-of-flight configuration, have permitted to detect the characteristic 3.0 MeV protons and 2.45 MeV neutrons emission from the nuclear fusion reactions. From massive absorbent targets we have evaluated the neutron flux by varying from negligible values up to about 5 × 10⁷ neutrons per laser shot in the case of foams targets, indicating a reaction rate of the order of 108 fusion events per laser shot using “advanced targets”.