Energy enhancement of quasi-monoenergetic proton bunches using a slice-cone target

Zheng, Jun; Sheng, Zheng-Ming; Liu, Jin-Lu; Zhou, Wei-Min; Xu, Han; Zhang, Jie
November 2011
Physics of Plasmas;Nov2011, Vol. 18 Issue 11, p113103
Academic Journal
A slice-cone target is proposed for the generation of quasi-monoenergetic proton bunches. In this new target structure, two symmetrical solid slices are adjoined obliquely to the tip of a hollow cone. Two-dimensional particle-in-cell simulations show that a large number of hot electrons are pulled out from the solid slices and accelerated forward by direct laser acceleration. Compared with the hollow cone target, a stronger electrostatic field at the rear surface of the slice-cone tip is set up by the hot electrons from the cone and the slices. As a result, the energy of the quasi-monoenergetic proton bunch produced through the target-normal sheath acceleration mechanism can be improved by 75%. It shows that the proton energy scales proportional to the square root of the laser intensity. For the incident laser with the focused intensity about 5 × 1020 W/cm2, one can obtain proton bunches with central energy 165 MeV and energy spread 13%.


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