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Characterization of an Intense Laser-Produced Preformed Plasma for Proton Generation
A Sagisaka,A. Noda,A. Fukumi,A. Yogo,A. S. Pirozhkov,H. Daido,K. Nemoto,K. Ogura,M. Nishiuchi,M. Mori,M. Kado,S. Orimo,S. Nakamura,T. Nayuki,T. Shirai,T. Fujii,Y. Oishi,Y. Hayashi,Y. Iwashita,Z. Li 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
High-energy protons are generated with a 3-μm-thick tantalum target irradiated with a highintensity laser under the preformed plasma condition. We observe the electron density distributions of preformed plasmas with two-color probe beams as interferometers. The preformed plasma at the front side of the target is generated by pre-pulses of a high-intensity Ti:sapphire laser. In this preformed plasma condition, the maximum proton enegy is 900 keV. The half angle of the generated proton beam (>500 keV) is about 10.
A. Ya. Faenov,Y. Fukuda,T. A. Pikuz,M. Kando,H. Kotaki,T. Homma,K. Kawase,T. Kameshima,I. Daito,Y. Hayashi,H. Sakaki,P. Bolton,A. Pirozhkov,A. Yogo,M. Tampo,T. Nakamura,M. Mori,K. Ogura,T. Kawachi,H. 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
The interaction of short intense laser pulses with clusters enhanced the absorption of the incident laser light compared to solid targets. Due to the increased absorption, these targets are heated significantly, leading to enhanced emission of X-rays and generation of multiply charged ions with kinetic energies from tens of keV to tens of MeV. Possible applications of these targets include an X-ray source for microscopy or lithography and an ion source for table-top accelerators. The recent results obtained in Kansai Photon Science Institute for the short, moderate intensity, ~5 × 1017W/cm2, laser pulses interactions with large clusters, are presented. Applications of a femtosecondlaser-plasma cluster-based source for different types of nanostructure imaging are discussed.