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Title: Hohlraum Designs for High Velocity Implosions on NIF

Abstract

In this paper, we compare experimental shock and capsule trajectories to design calculations using the radiation-hydrodynamics code HYDRA. The measured trajectories from surrogate ignition targets are consistent with reducing the x-ray flux on the capsule by about 85%. A new method of extracting the radiation temperature as seen by the capsule from x-ray intensity and image data shows that about half of the apparent 15% flux deficit in the data with respect to the simulations can be explained by HYDRA overestimating the x-ray flux on the capsule. The National Ignition Campaign (NIC) point-design target is designed to reach a peak fuel-layer velocity of 370 km/s by ablating 90% of its plastic (CH) ablator. The 192-beam National Ignition Facility laser drives a gold hohlraum to a radiation temperature (T{sub RAD}) of 300 eV with a 20 ns-long, 420 TW, 1.3 MJ laser pulse. The hohlraum x-rays couple to the CH ablator in order to apply the required pressure to the outside of the capsule. In this paper, we compare experimental measurements of the hohlraum T{sub RAD} and the implosion trajectory with design calculations using the code hydra. The measured radial positions of the leading shock wave and the unablated shell aremore » consistent with simulations in which the x-ray flux on the capsule is artificially reduced by 85%. We describe a new method of inferring the T{sub RAD} seen by the capsule from time-dependent x-ray intensity data and static x-ray images. This analysis shows that hydra overestimates the x-ray flux incident on the capsule by {approx}8%.« less

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1034520
Report Number(s):
LLNL-CONF-509371
TRN: US1200837
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 7th International Conference on Inertial Fusion Sciences and Applications, Bordeaux, France, Sep 12 - Sep 16, 2011
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DESIGN; GOLD; HYDRA; IGNITION; IMPLOSIONS; LASERS; PLASTICS; RADIATIONS; SHOCK WAVES; TARGETS; TRAJECTORIES; US NATIONAL IGNITION FACILITY; VELOCITY

Citation Formats

Meezan, N B, Hicks, D G, Callahan, D A, Olson, R E, Schneider, M S, Thomas, C A, Robey, H F, Celliers, P M, Kline, J K, Dixit, S N, Michel, P A, Jones, O S, Clark, D S, Ralph, J E, Doeppner, T, MacKinnon, A J, Haan, S W, Landen, O L, Glenzer, S H, Suter, L J, Edwards, M J, Macgowan, B J, Lindl, J D, and Atherton, L J. Hohlraum Designs for High Velocity Implosions on NIF. United States: N. p., 2011. Web.
Meezan, N B, Hicks, D G, Callahan, D A, Olson, R E, Schneider, M S, Thomas, C A, Robey, H F, Celliers, P M, Kline, J K, Dixit, S N, Michel, P A, Jones, O S, Clark, D S, Ralph, J E, Doeppner, T, MacKinnon, A J, Haan, S W, Landen, O L, Glenzer, S H, Suter, L J, Edwards, M J, Macgowan, B J, Lindl, J D, & Atherton, L J. Hohlraum Designs for High Velocity Implosions on NIF. United States.
Meezan, N B, Hicks, D G, Callahan, D A, Olson, R E, Schneider, M S, Thomas, C A, Robey, H F, Celliers, P M, Kline, J K, Dixit, S N, Michel, P A, Jones, O S, Clark, D S, Ralph, J E, Doeppner, T, MacKinnon, A J, Haan, S W, Landen, O L, Glenzer, S H, Suter, L J, Edwards, M J, Macgowan, B J, Lindl, J D, and Atherton, L J. Wed . "Hohlraum Designs for High Velocity Implosions on NIF". United States. https://www.osti.gov/servlets/purl/1034520.
@article{osti_1034520,
title = {Hohlraum Designs for High Velocity Implosions on NIF},
author = {Meezan, N B and Hicks, D G and Callahan, D A and Olson, R E and Schneider, M S and Thomas, C A and Robey, H F and Celliers, P M and Kline, J K and Dixit, S N and Michel, P A and Jones, O S and Clark, D S and Ralph, J E and Doeppner, T and MacKinnon, A J and Haan, S W and Landen, O L and Glenzer, S H and Suter, L J and Edwards, M J and Macgowan, B J and Lindl, J D and Atherton, L J},
abstractNote = {In this paper, we compare experimental shock and capsule trajectories to design calculations using the radiation-hydrodynamics code HYDRA. The measured trajectories from surrogate ignition targets are consistent with reducing the x-ray flux on the capsule by about 85%. A new method of extracting the radiation temperature as seen by the capsule from x-ray intensity and image data shows that about half of the apparent 15% flux deficit in the data with respect to the simulations can be explained by HYDRA overestimating the x-ray flux on the capsule. The National Ignition Campaign (NIC) point-design target is designed to reach a peak fuel-layer velocity of 370 km/s by ablating 90% of its plastic (CH) ablator. The 192-beam National Ignition Facility laser drives a gold hohlraum to a radiation temperature (T{sub RAD}) of 300 eV with a 20 ns-long, 420 TW, 1.3 MJ laser pulse. The hohlraum x-rays couple to the CH ablator in order to apply the required pressure to the outside of the capsule. In this paper, we compare experimental measurements of the hohlraum T{sub RAD} and the implosion trajectory with design calculations using the code hydra. The measured radial positions of the leading shock wave and the unablated shell are consistent with simulations in which the x-ray flux on the capsule is artificially reduced by 85%. We describe a new method of inferring the T{sub RAD} seen by the capsule from time-dependent x-ray intensity data and static x-ray images. This analysis shows that hydra overestimates the x-ray flux incident on the capsule by {approx}8%.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {10}
}

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