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Effects of the laser pulse irradiation point on a double layer target on the accelerated ion beam parameters

Morita, Toshimasa; Bulanov, S. V.; Esirkepov, T. Z.; Koga, J. K.; Yamagiwa, Mitsuru

In proton acceleration by a laser pulse obliquely incident on a double layer target, it is shown by PIC simulations that the energy spread of the generated protons can be reduced by irradiating the laser pulse on to the off-center position of the target. This provides a way to control the proton energy spectrum. The high energy protons are found to come from an area shifted from the initial target center towards the propagation direction of the laser pulse. We show that the high energy protons with much smaller energy spread can be obtained by appropriately adjusting the size and position of the second proton layer.



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