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Title: Asymmetric-shell ignition capsule design to tune the low-mode asymmetry during the peak drive

Abstract

The low-mode radiation flux asymmetry in the hohlraum is a main source of performance degradation in the National Ignition Facility (NIF) implosion experiments. To counteract the deleterious effects of the large positive P2 flux asymmetry during the peak drive, this paper develops a new tuning method called asymmetric-shell ignition capsule design which adopts the intentionally asymmetric CH ablator layer or deuterium-tritium (DT) ice layer. A series of two-dimensional implosion simulations have been performed, and the results show that the intentionally asymmetric DT ice layer can significantly improve the fuel ρR symmetry, hot spot shape, hot spot internal energy, and the final neutron yield compared to the spherical capsule. This indicates that the DT asymmetric-shell capsule design is an effective tuning method, while the CH ablator asymmetric-shell capsule could not correct the fuel ρR asymmetry, and it is not as effective as the DT asymmetric-shell capsule design.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)
Publication Date:
OSTI Identifier:
22599914
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; CAPSULES; COMPARATIVE EVALUATIONS; DESIGN; DEUTERIUM; FUELS; HOT SPOTS; IMPLOSIONS; LAYERS; NEUTRONS; PEAKS; RADIATION FLUX; SHELLS; SPHERICAL CONFIGURATION; THERMONUCLEAR IGNITION; TRITIUM; TWO-DIMENSIONAL CALCULATIONS; US NATIONAL IGNITION FACILITY

Citation Formats

Gu, Jianfa, E-mail: gu-jianfa@iapcm.ac.cn, Dai, Zhensheng, E-mail: dai-zhensheng@iapcm.ac.cn, Song, Peng, Zou, Shiyang, Ye, Wenhua, Zheng, Wudi, Gu, Peijun, Wang, Jianguo, and Zhu, Shaoping. Asymmetric-shell ignition capsule design to tune the low-mode asymmetry during the peak drive. United States: N. p., 2016. Web. doi:10.1063/1.4960658.
Gu, Jianfa, E-mail: gu-jianfa@iapcm.ac.cn, Dai, Zhensheng, E-mail: dai-zhensheng@iapcm.ac.cn, Song, Peng, Zou, Shiyang, Ye, Wenhua, Zheng, Wudi, Gu, Peijun, Wang, Jianguo, & Zhu, Shaoping. Asymmetric-shell ignition capsule design to tune the low-mode asymmetry during the peak drive. United States. doi:10.1063/1.4960658.
Gu, Jianfa, E-mail: gu-jianfa@iapcm.ac.cn, Dai, Zhensheng, E-mail: dai-zhensheng@iapcm.ac.cn, Song, Peng, Zou, Shiyang, Ye, Wenhua, Zheng, Wudi, Gu, Peijun, Wang, Jianguo, and Zhu, Shaoping. Mon . "Asymmetric-shell ignition capsule design to tune the low-mode asymmetry during the peak drive". United States. doi:10.1063/1.4960658.
@article{osti_22599914,
title = {Asymmetric-shell ignition capsule design to tune the low-mode asymmetry during the peak drive},
author = {Gu, Jianfa, E-mail: gu-jianfa@iapcm.ac.cn and Dai, Zhensheng, E-mail: dai-zhensheng@iapcm.ac.cn and Song, Peng and Zou, Shiyang and Ye, Wenhua and Zheng, Wudi and Gu, Peijun and Wang, Jianguo and Zhu, Shaoping},
abstractNote = {The low-mode radiation flux asymmetry in the hohlraum is a main source of performance degradation in the National Ignition Facility (NIF) implosion experiments. To counteract the deleterious effects of the large positive P2 flux asymmetry during the peak drive, this paper develops a new tuning method called asymmetric-shell ignition capsule design which adopts the intentionally asymmetric CH ablator layer or deuterium-tritium (DT) ice layer. A series of two-dimensional implosion simulations have been performed, and the results show that the intentionally asymmetric DT ice layer can significantly improve the fuel ρR symmetry, hot spot shape, hot spot internal energy, and the final neutron yield compared to the spherical capsule. This indicates that the DT asymmetric-shell capsule design is an effective tuning method, while the CH ablator asymmetric-shell capsule could not correct the fuel ρR asymmetry, and it is not as effective as the DT asymmetric-shell capsule design.},
doi = {10.1063/1.4960658},
journal = {Physics of Plasmas},
number = 8,
volume = 23,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}