Development of Improved Radiation Drive Environment for High Foot Implosions at the National Ignition Facility.

Autor: Hinkel DE; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Berzak Hopkins LF; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Ma T; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Ralph JE; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Albert F; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Benedetti LR; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Celliers PM; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Döppner T; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Goyon CS; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Izumi N; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Jarrott LC; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Khan SF; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Kline JL; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA., Kritcher AL; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Kyrala GA; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA., Nagel SR; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Pak AE; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Patel P; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Rosen MD; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Rygg JR; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Schneider MB; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Turnbull DP; Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14625, USA., Yeamans CB; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Callahan DA; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Hurricane OA; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2016 Nov 25; Vol. 117 (22), pp. 225002. Date of Electronic Publication: 2016 Nov 23.
DOI: 10.1103/PhysRevLett.117.225002
Abstrakt: Analyses of high foot implosions show that performance is limited by the radiation drive environment, i.e., the hohlraum. Reported here are significant improvements in the radiation environment, which result in an enhancement in implosion performance. Using a longer, larger case-to-capsule ratio hohlraum at lower gas fill density improves the symmetry control of a high foot implosion. Moreover, for the first time, these hohlraums produce reduced levels of hot electrons, generated by laser-plasma interactions, which are at levels comparable to near-vacuum hohlraums, and well within specifications. Further, there is a noteworthy increase in laser energy coupling to the hohlraum, and discrepancies with simulated radiation production are markedly reduced. At fixed laser energy, high foot implosions driven with this improved hohlraum have achieved a 1.4×increase in stagnation pressure, with an accompanying relative increase in fusion yield of 50% as compared to a reference experiment with the same laser energy.
Databáze: MEDLINE
Externí odkaz: