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Generating Proton Beams Exceeding 10 MeV Using High Contrast 60TW Laser

耿易星  廖庆  寿寅任  朱军高  徐筱菡  吴旻剑  王鹏杰  李东彧  杨童  胡荣豪  王大辉  赵研英  马文君  卢海洋  袁忠喜  林晨  颜学庆  
【摘要】:A prototype of a laser driven proton accelerator is built at Peking University. Protons exceeding 10 MeV are accelerated from micrometer-thick aluminum targets irradiated by tightly focused laser pulse with 1.8 J energy and 30 fs duration. The beam energy spectrum and charge distribution are measured by a Thomson parabola spectrometer and radiochromic film stacks. The sensitivity of proton cut-off energy to the focusing of the laser beam, the pulse duration, and the foil thickness are systematically investigated in the experiments. Stable proton beams have been produced with an optimized parameter set, providing a cornerstone for the future applications of laser accelerated protons.

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