Polar-direct-drive experiments on OMEGA

Details Polar-direct-drive experiments on OMEGA Polar-direct-drive experiments on OMEGA

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jphy4.133..153m&link_type=abstract

Journal de Physique IV (Proceedings), Volume 133, Issue 1, June 2006, pp.153-157

Physics

4

Scientific paper

Polar direct drive (PDD), a promising ignition path for the NIF while the beams are in the indirect-drive configuration [S. Skupsky et al., Phys. Plasmas 11, 2763 (2004)], is currently being investigated on the OMEGA laser system by using 40 beams in six rings repointed to more uniformly illuminate the target [R. S. Craxton et al., Phys. Plasmas 12, 056304 (2005).]. The OMEGA experiments are being performed with standard, “warm” targets (865-μ m-diam, 20-μ m-thick, CH shells filled with 15-atm D{2}) with and without the use of an equatorial “Saturn-like” toroidally shaped CH ring [R. S. Craxton and D. W. Jacobs-Perkins, Phys. Rev. Lett. 94, 095002 (2005)] (nominal dimensions: 2.2-mm diam measured to ring center, 0.3-mm thick). For the Saturn case, the plasma formed around the ring refracts light toward the target equator as the ring plasma expands. The nominal laser drive is a 1-ns flat pulse, ˜400 J per beam, employing 1-THz, 2-D SSD with polarization smoothing. Target implosion symmetry is diagnosed with framed x-ray backlighting using additional OMEGA beams and by time-integrated x-ray imaging of the stagnating core. The best results have been obtained with Saturn targets by varying the beam pointing and ring diameter, achieving ˜75% of the fusion yield from symmetrically illuminated targets with the same total energy (60 beams, 15.3 kJ).

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