6,123 research outputs found
Generation of high-energy monoenergetic heavy ion beams by radiation pressure acceleration of ultra-intense laser pulses
A novel radiation pressure acceleration (RPA) regime of heavy ion beams from
laser-irradiated ultrathin foils is proposed by self-consistently taking into
account the ionization dynamics. In this regime, the laser intensity is
required to match with the large ionization energy gap when the successive
ionization of high-Z atoms passing the noble gas configurations [such as
removing an electron from the helium-like charge state to
]. While the target ions in the laser wing region are ionized
to low charge states and undergo rapid dispersions due to instabilities, a
self-organized, stable RPA of highly-charged heavy ion beam near the laser axis
is achieved. It is also found that a large supplement of electrons produced
from ionization helps preserving stable acceleration. Two-dimensional
particle-in-cell simulations show that a monoenergetic beam
with peak energy and energy spread of is obtained by
lasers at intensity .Comment: 5 pages, 4 figure
Electron and ion acceleration from femtosecond laser-plasma peeler scheme
Using three-dimensional particle-in-cell simulations, we further investigate
the electron and ion acceleration from femtosecond laser-plasma peeler scheme
which was proposed in our recent paper (Shen et al 2021 Phys. Rev. X 11
041002). In addition to the standard setup where a laser pulse impinges on an
edge of a single tape target, two new variants of the target, i.e., a parallel
tape and a cross tape target, were proposed, where strong surface plasma waves
can also be efficiently excited at the front edges of the target. By using a
tabletop 200 TW-class laser pulse, we observe generation of high-flux,
well-collimated, superponderomotive electrons. More importantly,
quasimonoenergetic proton beams can always be obtained in all the three setups,
while with the single tape case, the obtained proton beam has the highest peak
energy and narrowest spectrum
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