Generation of fast protons in moderate-intensity laser-plasma interaction from rear sheath

【摘要】 Forward fast protons are generated by the moderate-intensity laser-foil interaction.Protons with maximum energy 190 keV are measured by using magnetic spectrometer and CR-39 solid state track detectors along the direction normal to the rear surface.The experimental results are also modeled by the particle-in-cell method,investigating the timevarying electron temperature and the rear sheath field.The temporal and spatial structure of the sheath electrical field,revealed in the simulation,suggests that these protons are accelerated by target normal sheath acceleration(TNSA) mechanism.更多还原

【Abstract】 Forward fast protons are generated by the moderate-intensity laser-foil interaction.Protons with maximum energy 190 keV are measured by using magnetic spectrometer and CR-39 solid state track detectors along the direction normal to the rear surface.The experimental results are also modeled by the particle-in-cell method,investigating the timevarying electron temperature and the rear sheath field.The temporal and spatial structure of the sheath electrical field,revealed in the simulation,suggests that these protons are accelerated by target normal sheath acceleration(TNSA) mechanism.更多还原