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Efficient production of MeV proton beam from a Polyimide target driven by an intense femto-second laser

Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Ma, J.-L.; Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Kiriyama, Hiromitsu; Bulanov, S. V.; Esirkepov, T. Z.; Nagatomo, Hideo*; Nagai, Keiji*; Oishi, Yuji*; Nemoto, Koshichi*; Choi, I. W.*; Kim, C. M.*; Jeong, T. M.*; Hafz, N.*; Yu, T. J.*; Sung, J. H.*; Noh, Y.-C.*; Ko, D.-K.*; Lee, J.*; Azuma, Hirozumi*

The efficient proton beam whose maximum energy of up to 4 MeV was produced by the 50TW short pulse intensity Ti:Sap laser irradiated on the polyimide target [(C16H6O4N2)n] with the thicknesses of 7.5$$mu$$m, 12.5$$mu$$m, 25$$mu$$m, which is transparent to the 800nm laser. The laser parameters are energy of 1.7J, pulse width of 35fs and the intensity of 3$$times$$10$$^{19}$$Wcm$$^{-2}$$. The contrast of the ASE component is 4$$times$$10$$^{-8}$$. The conversion efficiency from laser energy into the proton kinetic energy is up to $$sim$$3%. This conversion efficiency is comparable or even higher than the results obtained with the same level laser ($$sim$$ J energy) interacts with the nano-meter level ultra thin target. In this paper we discuss on the comparison between our results and other experimental results obtained in other facilities.

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