Symmetry experiments in thinwall gas filled hohlraums with smooth beams at NOVA

Details Symmetry experiments in thinwall gas filled hohlraums with smooth beams at NOVA Symmetry experiments in thinwall gas filled hohlraums with smooth beams at NOVA

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppoto101d&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #oThaO101.

Physics

Plasma Physics

Scientific paper

We report on the results of a recent series of experiments using gas filled hohlraums with smooth laser beams at the Nova laser facility. The purpose of using kineform phase plates to smooth all ten of Nova's beams is to reduce beam steering due to plasma flow and filamentation, an effect seen in our previous series of gas filled hohlraum experiments at Nova with unsmoothed beams(N. Delamater,et.al.,Physics of Plasmas,3,2022,1996). Our experiments use thin-walled gold hohlraums filled with methane gas. The thin wall hohlraum allows simultaneous imaging of laser spots on the hohlraum wall and implosion cores. The imaging of laser spots allows the direct measurement of any plasma induced beam steering. The results show that the symmetry scaling of implosions in gas filled hohlraums is consistent with time integrated modeling. The effect of smoothing the ten Nova beams with KPP phase plates is to remove most of the beam bending which had been observed previously, leaving a residual shift of only 35 microns. These experiments are relevant to those currently being planned for the National Ignition Facility.

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