Tri-stage quasimonoenergetic proton acceleration from a multi-species thick target

Y. Wan, C. H. Pai, J. F. Hua, Y. P. Wu, W. Lu, F. Li, C. J. Zhang, X. L. Xu, C. Joshi, W. B. Mori

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We show that quasimonoenergetic proton beams can be generated through a multi-ion thick target irradiated by a circularly polarized laser pulse. After disrupted by the transverse instabilities in the laser pressure acceleration process, heavy ions as majority species can still provide a co-moving electric field. Different from the dynamics using ultrathin foil, protons with small doped rates can experience a full tri-stage quasimonoenergetic acceleration (hole boring, sheath boosting, and free expansion stages) in this scenario. A theoretical model is developed to explain the proton energy evolution in detail and verified by two-dimensional particle-in-cell simulations. The scaling of proton energy with laser intensity indicates that the 200 MeV proton beam with narrow energy spread (3%-10%) and sufficiently large charges (1010-1011) required for medical applications can be obtained using 100s TW class laser systems in near future.

Original languageEnglish
Article number073105
JournalPhysics of Plasmas
Issue number7
StatePublished - 1 Jul 2018


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