@article{oai:repo.qst.go.jp:00048503,
 author = {守田, 利昌 and 守田 利昌},
 issue = {8},
 journal = {Physics of Plasmas},
 month = {Aug},
 note = {Ion acceleration using a laser pulse irradiating a thin disk target is examined
using three-dimensional and two-dimensional particle-in-cell simulations.
A laser pulse of $620$ TW, with an intensity of $5\times 10^{21}$ W/cm$^{2}$
and a duration of $27$ fs is irradiated on to a double-layer target.
Simulations are performed by varying the ion density, i.e., electron density,
of the first layer with a fixed areal mass density.
It is shown that the obtained proton energy increases dramatically for
a certain density of the first layer,
which is made of a material having a small mass over charge ratio, ``light'' material, such as carbon; that is, the Coulomb explosion of the target and radiation pressure acceleration act effectively above a certain density. Moreover, even for the same electron density, the reflection of the laser pulse
from the first layer is small for a ``light'' material.},
 pages = {083104-1--083104-11},
 title = {Proton energy behavior by variation of the target density in laser acceleration},
 volume = {24},
 year = {2017}
}