Core performance and mix in direct-drive spherical implosions with high uniformity
Open Access
- 20 April 2001
- journal article
- research article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 8 (5), 2251-2256
- https://doi.org/10.1063/1.1350964
Abstract
The performance of gas-filled, plastic-shell implosions has significantly improved with advances in on-target uniformity on the 60-beam OMEGA laser system [T. R. Boehly, D. L. Brown, R. S. Craxton et al., Opt. Commun. 133, 495 (1997)]. Polarization smoothing (PS) with birefringent wedges and 1-THz-bandwidth smoothing by spectral dispersion (SSD) have been installed on OMEGA. The beam-to-beam power imbalance is rms. Implosions of 20-μm-thick CH shells (15 atm fill) using full beam smoothing (1-THz SSD and PS) have primary neutron yields and fuel areal densities that are larger than those driven with 0.35-THz SSD without PS. They also produce of the predicted one-dimensional neutron yield. The results described here suggest that individual-beam nonuniformity is no longer the primary cause of nonideal target performance. A highly constrained model of the core conditions and fuel–shell mix has been developed. It suggests that there is a “clean” fuel region, surrounded by a mixed region, that accounts for half of the fuel areal density.
Keywords
This publication has 20 references indexed in Scilit:
- Analysis of a direct-drive ignition capsule designed for the National Ignition FacilityPhysics of Plasmas, 2001
- Modeling hydrodynamic instabilities in inertial confinement fusion targetsPhysics of Plasmas, 2000
- Direct-drive, hollow-shell implosion studies on the 60-beam, UV OMEGA laser systemPhysics of Plasmas, 2000
- Measurements of core and pusher conditions in surrogate capsule implosions on the OMEGA laser systemPhysics of Plasmas, 1998
- Initial performance results of the OMEGA laser systemOptics Communications, 1997
- Review of secondary and tertiary reactions, and neutron scattering as diagnostic techniques for inertial confinement fusion targetsLaser and Particle Beams, 1991
- Improved laser-beam uniformity using the angular dispersion of frequency-modulated lightJournal of Applied Physics, 1989
- Cryogenic-laser-fusion target implosion studies performed with the OMEGA uv-laser systemPhysical Review A, 1989
- Use of induced spatial incoherence for uniform illumination of laser fusion targetsOptics Communications, 1983
- Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) ApplicationsNature, 1972