TITLE

Laser-driven quasimonoenergetic proton burst from water spray target

AUTHOR(S)
Ramakrishna, B.; Murakami, M.; Borghesi, M.; Ehrentraut, L.; Nickles, P. V.; Schnürer, M.; Steinke, S.; Psikal, J.; Tikhonchuk, V.; Ter-Avetisyan, S.
PUB. DATE
August 2010
SOURCE
Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p083113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A narrow band proton bursts at energies of 1.6±0.08 MeV were observed when a water spray consisting of ∅︀(150 nm)-diameter droplets was irradiated by an ultrashort laser pulse of about 45 fs duration and at an intensity of 5×1019 W/cm2. The results are explained by a Coulomb explosion of sub-laser-wavelength droplets composed of two ion species. The laser prepulse plays an important role. By pre-evaporation of the droplets, its diameter is reduced so that the main pulse can interact with a smaller droplet, and this remaining bulk can be ionized to high states. In the case of water, the mixture of quite differently charged ions establishes an “iso-Coulomb-potential” during the droplet explosion such that protons are accelerated to a peak energy with a narrow energy spread. The model explains this crucial point, which differs critically from usual Coulomb explosion or ion sheath acceleration mechanisms.
ACCESSION #
53421725

 

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