Drive symmetry experiments with phased beams on Nova.

Details Drive symmetry experiments with phased beams on Nova. Drive symmetry experiments with phased beams on Nova.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dpplwp403h&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #lWepP403.

Physics

Plasma Physics

Scientific paper

Time-dependent control of drive symmetry in a hohlraum requires the ability to adjust the laser power as a function of both time and position along the hohlraum axis. We have implemented this control on the Nova laser ("beam phasing") by delivering two independent pulse shapes on inner and outer halves of the Nova beams incident inside a hohlraum target. Time-integrated symmetry as measured by implosion core imaging is predicted to be the same for both phased and unphased beams, but the improvement in P2 pressure symmetry with this control for Nova is predicted to be as much as a factor of 3 at various times in the laser pulse. We will describe the beam phasing setup on Nova, and present measurements of time-resolved symmetry by backlit imposions and surrogate foam balls.

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