X-ray measurements of laser energy deposition in NOVA hohlraums

Details X-ray measurements of laser energy deposition in NOVA hohlraums X-ray measurements of laser energy deposition in NOVA hohlraums

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dpplwp401f&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #lWepP401.

Physics

Plasma Physics

Scientific paper

Excellent drive symmetry is required for high gain ICF. Current NIF designs use a fill gas to limit expansion of the gold wall, so the laser beams can propagate into the hohlraum and be absorbed near the original wall location. Initial NOVA experiments, with unsmoothed beams, found that the compressed fuel capsule eccentricity was more oblate (or pancaked) when a methane gas fill was used, contrary to numerical predictions, and consistent with an outward shift in the laser beam absorption location. To measure the eccentricity and laser absorption locations simultaneously, a thinner-walled hohlraum, 2 instead of 25 microns thick, was developed. We found that shifts in spot location and capsule eccentricity are correlated, and that beam smoothing (via kineform phase plates) strongly reduces the shift produced by methane fill. We have also estimated the uncertainties in the spot measurements by comparing data obtained from different azimuthal views.

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