High Energy Ions and Neutrons Produced by Ultrashort Intense Laser Pulses

摘要

Generation of D(d,n)~3He neutron in plasmas produced by ultrashort intense pulse laser was studied with a table-top TW Ti:sapphire laser. The 130fs, 200mJ pulses with a prepulse, 300ps prior to the main pulse were focused on a deuterated polystyrene target by an aspherical lens, and the focal intensity was 10~18W/cm~2. 10 neutrons per shot on the average were measured with a ~3He detector. By ion energy spectroscopy with Cr-39 track detectors, it has been found that the number of high-energy deuterium ions generated from the laser plasma was about 10~6 ions per shot in the energy range above 150keV.