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First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum.
- Source :
-
Physical Review Letters . 5/1/2015, Vol. 114 Issue 17, p175001-1-175001-5. 5p. - Publication Year :
- 2015
-
Abstract
- Recent experiments on the National Ignition Facility [M. J. Edwards et al., Phys. Plasmas 20, 070501 (2013)] demonstrate that utilizing a near-vacuum hohlraum (low pressure gas-filled) is a viable option for high convergence cryogenic deuterium-tritium (DT) layered capsule implosions. This is made possible by using a dense ablator (high-density carbon), which shortens the drive duration needed to achieve high convergence: a measured 40% higher hohlraum efficiency than typical gas-filled hohlraums, which requires less laser energy going into the hohlraum, and an observed better symmetry control than anticipated by standard hydrodynamics simulations. The first series of near-vacuum hohlraum experiments culminated in a 6.8 ns, 1.2 MJ laser pulse driving a 2-shock, high adiabat (α ~ 3.5) cryogenic DT layered high density carbon capsule. This resulted in one of the best performances so far on the NIF relative to laser energy, with a measured primary neutron yield of 1.8 × 1015 neutrons, with 20% calculated alpha heating at convergence ~27 × . [ABSTRACT FROM AUTHOR]
- Subjects :
- *CRYOGENICS
*DEUTERIUM compounds
*ABLATIVE materials
*LASER ablation
*HYDRODYNAMICS
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 114
- Issue :
- 17
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 102753209
- Full Text :
- https://doi.org/10.1103/PhysRevLett.114.175001