Intense laser-driven energetic proton beams from solid density targets |
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Authors: | Zhou C T He X T |
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Affiliation: | Center for Applied Physics and Technology, Peking University, Beijing 100871, China. zcangtao@iapcm.ac.cn |
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Abstract: | The effects of target density on proton acceleration driven by an intense sub-ps laser pulse are investigated using two-dimensional hybrid particle-in-cell simulations. Results show that at higher density the target-normal-sheath acceleration (TNSA) is more effective than shock acceleration for protons from a plastic target. Furthermore a lower-density target is favorable to higher energy of the TNSA protons. Moreover, the longitudinal electric fields at the target surfaces may reveal typical inhomogeneous structures for a long acceleration time. The conversion efficiency of laser energy into particle (electron, proton, and C(+) ion) energy is found to increase with decreasing target density. |
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