Hot Electrons Transverse Refluxing in Ultraintense Laser-Solid Interactions
Language
en
Article de revue
This item was published in
Physical Review Letters. 2010-07-02, vol. 105, p. 015005
American Physical Society
English Abstract
We have analyzed the coupling of ultraintense lasers (at 2 1019 W=cm2) with solid foils of limited transverse extent (10 s of m) by monitoring the electrons and ions emitted from the target.We observe that reducing the ...Read more >
We have analyzed the coupling of ultraintense lasers (at 2 1019 W=cm2) with solid foils of limited transverse extent (10 s of m) by monitoring the electrons and ions emitted from the target.We observe that reducing the target surface area allows electrons at the target surface to be reflected from the target edges during or shortly after the laser pulse. This transverse refluxing can maintain a hotter, denser and more homogeneous electron sheath around the target for a longer time. Consequently, when transverse refluxing takes places within the acceleration time of associated ions, we observe increased maximum proton energies (up to threefold), increased laser-to-ion conversion efficiency (up to a factor 30), and reduced divergence which bodes well for a number of applications.Read less <
Keywords
ION-ACCELERATION
PULSE
TRANSPORT
SURFACE
FOILS
Origin
Hal imported