High-energy monoenergetic proton bunch from laser interaction with a complex target

Fengchao Wang; Baifei Shen; Xiaomei Zhang; Zhangying Jin; Meng Wen; Liangliang Ji; Wenpeng Wang; Jiancai Xu; Yu, M. Y.; Cary, J.
September 2009
Physics of Plasmas;Sep2009, Vol. 16 Issue 9, p093112
Academic Journal
Generation of high-energy proton bunch in the interaction of a high-power laser pulse with a complex target consisting of a front horizontal slice adjoining a conventional heavy ion and proton double-layer slab is investigated using two-dimensional particle-in-cell simulation. The laser pulse propagates along both sides of the slice. A large number of hot electrons are generated and accelerated by the surface ponderomotive force, and transported through the double layer, forming a backside sheath field which is considerably stronger and more localized than that produced by the electrons from a simple double layer. As a result, the protons in the proton layer can be accelerated to energies more than three times, and the energy spread halved, that from the simple double layer.


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