Short-laser-pulse-driven emission of energetic ions into a solid target from a surface layer spalled by a laser prepulse |
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Authors: | AG Zhidkov LV Zhigilei A Sasaki T Tajima |
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Institution: | (1) Advanced Photon Research Center, JAERI, 25-1 Mii-minami-machi, Neyagawa, Osaka, 572-0019, Japan, JP;(2) Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22903, USA, US;(3) Lawrence Livermore National Laboratory, L-441, Livermore, CA 94551, USA, US;(4) General Physics Institute, 117945, Vavilov, 38, Moscow, Russia, RU |
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Abstract: | An efficient emission of picosecond bunches of energetic protons and carbon ions from a thin layer spalled from a organic
solid by a laser prepulse is demonstrated numerically. We combine the molecular dynamics technique and multi-component collisional
particle-in-cell method with plasma ionization to simulate the laser spallation and ejection of a thin (∼20–30 nm) solid layer
from an organic target and its further interaction with an intense femtosecond laser pulse. In spite of its small thickness,
a layer produced by laser spallation efficiently absorbs ultrashort laser pulses with the generation of hot electrons that
convert their energy to ion energy. The efficiency of the conversion of the laser energy to ions can be as high as 20%, and
10% to MeV ions. A transient electrostatic field created between the layer and surface of the target is up to 10 GV/cm.
Received: 13 March 2001 / Accepted: 20 March 2001 / Published online: 20 June 2001 |
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Keywords: | PACS: 79 20 Ds 61 80 Az 52 40 02 70 Ns |
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