The compression of direct-drive, spherical implosions is studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser with intensities ranging from ∼3×1014 to ∼1×1015W/cm2. The hard-x-ray signal from hot electrons generated by laser-plasma instabilities increases with laser intensity, while the areal density decreases. Mitigating hot-electron production, by reducing the laser intensity to ∼3×1014W/cm2, results in areal density of the order of ∼140mg/cm2, in good agreement with 1D simulations. These results will be considered in future direct-drive-ignition designs.
|Journal||Physical Review Letters|
|State||Published - 8 May 2008|
ASJC Scopus subject areas
- Physics and Astronomy (all)