| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Quasi-monoenergetic Tens-of-MeV Proton Beams by a Laser-Illuminated Funnel-Like Target |
| BAN Hong-Ye1, GU Yan-Jun1, KONG Qing1**, LI Ying-Ying1, ZHU Zhen1, S. Kawata2 |
1Applied Ion Beam Physics Laboratory, Key Laboratory of the Ministry of Education, Institute of Modern Physics, Fudan University, Shanghai 200433
2Department of Interdisciplinary Sciences, Utsunomiya University, Yohtoh 712, Utsunomiya 3218585, Japan
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| Cite this article: |
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ZHU Zhen, S. Kawata, LI Ying-Ying et al 2012 Chin. Phys. Lett. 29 035202 |
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Abstract From numerical simulations, we study the generation of quasi-monoenergetic MeV proton beams from a laser-illuminated funnel-like target. We show that, when passing through such a target, the laser beam can be focused and constricted within a cylindrical bore at the funnel apex from which proton beams are produced. Accompanied by a much-enhanced laser intensity, the proton beams experience more acceleration time than with normal funnel targets. Constriction from the cylinder bore, combined with an enhancement of a separated charge field from Al electrons, protons can attain higher energies up to several tens of MeV. At the same time, strong suppression of the transverse divergence of the laser and proton beams yields a localized, collimated, mono-energetic proton beam.
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| Keywords:
52.38.-r
52.38.Kd
41.75.Jv
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Received: 07 December 2011
Published: 11 March 2012
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| PACS: |
52.38.-r
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(Laser-plasma interactions)
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52.38.Kd
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(Laser-plasma acceleration of electrons and ions)
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41.75.Jv
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(Laser-driven acceleration?)
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