Fast ignition researches at the GEKKO MII 60TW laser system.
Abstract
Many experiments at intensities of lower than 10^17W/cm^2 have shown that the stimulated Raman scatter or two plasmon decay instabilities near a quarter critical density produces many hot electrons. At ultra-high intensities, thus the produced electrons can be used for heating of a compressed core in Inertial Confinement Fusion. Using the GEKKO MII 60TW Ti:Sapphire-Nd:glass CPA system, we measured the behaviors of the instabilities near a quarter critical density. The targets are plane CH. We measured the sidescatter light near fundamental, three-halves and second harmonic frequencies. The observation angles are either 90 degrees or 160 degrees from the laser incidence. As well, we estimated the hole boring velocities at the critical and quarter critical densities from the backscatter spectrum shifts.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 1998
- Bibcode:
- 1998APS..DPP.U9P45M