Efficient proton acceleration and focusing by an ultraintense laser interacting with a parabolic double concave target with an extended rear
Physics of Plasmas, ISSN: 1070-664X, Vol: 20, Issue: 7
2013
- 2Citations
- 13Captures
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Article Description
A new scheme for acceleration and focusing of protons via an improved parabolic double concave target irradiated by an ultraintense laser pulse is proposed. When an intense laser pulse illuminates a concave target, the hot electrons are concentrated on the focal region of the rear cavity and they form a strong space-charge-separation field, which accelerates the protons. For a simple concave target, the proton energy spectrum becomes very broad outside the rear cavity because of transverse divergence of the electromagnetic fields. However, particle-in-cell simulations show that, when the concave target has an extended rear, the hot electrons along the wall surface induce a transverse focusing sheath field, resulting in a clear enhancement of proton focusing, which makes the lower proton energy spread, while, leads to a little reduction of the proton bunch peak energy. © 2013 AIP Publishing LLC.
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