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We observe UV harmonics and protons with a 7.5-mum-thick polyimide target irradiated with a high-intensity Ti:sapphire laser. The laser intensity dependence of UV harmonics and proton signal is measured by varying the distance between the target surface and the best focus of the laser beam. In the case of appropriate condition for proton generation with a maximum energy of ~2.7 MeV, the weak broad...
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