Experimental study of femtosecond laser-introduced generation of high energy ions

To study the distribution characteristics of high energy ions in the interaction with femtosecond pulse laser with solid targets, high energy ions behavior at the normal direction of the rear surface of the target produced from ulintencity pulse laser irradiated Cu thin film solid targets is explored on SILEX-I laser facility. The solid nuclear detector CR39 and Thomson spectrum are used to detect the energy spectra of protons and carbon ions. Protons H+and carbon ions C1+, C2+, C3+and C4+have been observed. In addition, the results show that the ions are cut-off at a certain energy, and the ratio of the maximum cut-off energy of the C1+, C2+, C3+and C4+ions is about 1:2:3:4.Moreover, the carbon ions traces are much weaker than the protons trace, so the yields of protons can be much higher than carbon ions, and the protons have the screening effect on the carbon ions. And the cut-off energy of the carbon ion is increased with the charge-to-mass ratio in the same shot. The results will provide the reference for inertial confinement fusion (ICF) "quick ignition" feasibility analysis.