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Title: Effects of the P2 M-band flux asymmetry of laser-driven gold Hohlraums on the implosion of ICF ignition capsule

Abstract

Low-mode asymmetries in the laser-indirect-drive inertial confinement fusion implosion experiments conducted on the National Ignition Facility [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] are deemed the main obstacles hindering further improvement of the nuclear performance of deuterium-tritium-layered capsules. The dominant seeds of these asymmetries include the P2 and P4 asymmetries of x-ray drives and P2 asymmetry introduced by the supporting “tent.” Here, we explore the effects of another possible seed that can lead to low-mode asymmetric implosions, i.e., the M-band flux asymmetry (MFA) in laser-driven cylindrical gold Hohlraums. It is shown that the M-band flux facilitates the ablation and acceleration of the shell, and that positive P2 MFAs can result in negative P2 asymmetries of hot spots and positive P2 asymmetries of shell's ρR. An oblate or toroidal hot spot, depending on the P2 amplitude of MFA, forms at stagnation. The energy loss of such a hot spot via electron thermal conduction is seriously aggravated not only due to the enlarged hot spot surface but also due to the vortices that develop and help transferring thermal energy from the hotter center to the colder margin of such a hot spot. The cliffs of nuclear performance for themore » two methodologies of applying MFA (i.e., symmetric flux in the presence of MFA and MFA added for symmetric soft x-ray flux) are obtained locating at 9.5% and 5.0% of P2/P0 amplitudes, respectively.« less

Authors:
 [1]; ; ; ; ; ; ; ; ; ;  [1];  [2]; ;  [1];  [3]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China)
  2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900 (China)
  3. China Academy of Engineering Physics, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22599998
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; AMPLITUDES; ASYMMETRY; CAPSULES; CYLINDRICAL CONFIGURATION; DEUTERIUM; ELECTRONS; ENERGY LOSSES; GOLD; HOT SPOTS; IMPLOSIONS; INERTIAL CONFINEMENT; LASERS; SOFT X RADIATION; THERMAL CONDUCTION; THERMONUCLEAR IGNITION; TRITIUM; US NATIONAL IGNITION FACILITY

Citation Formats

Li, Yongsheng, Graduate School, China Academy of Engineering Physics, Beijing 100088, Gu, Jianfa, Wu, Changshu, Song, Peng, Dai, Zhensheng, Li, Shuanggui, Li, Xin, Kang, Dongguo, Gu, Peijun, Zheng, Wudi, Zou, Shiyang, Ding, Yongkun, Center for Applied Physics and Technology, Peking University, Beijing 100871, Lan, Ke, Ye, Wenhua, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Zhang, Weiyan. Effects of the P2 M-band flux asymmetry of laser-driven gold Hohlraums on the implosion of ICF ignition capsule. United States: N. p., 2016. Web. doi:10.1063/1.4958811.
Li, Yongsheng, Graduate School, China Academy of Engineering Physics, Beijing 100088, Gu, Jianfa, Wu, Changshu, Song, Peng, Dai, Zhensheng, Li, Shuanggui, Li, Xin, Kang, Dongguo, Gu, Peijun, Zheng, Wudi, Zou, Shiyang, Ding, Yongkun, Center for Applied Physics and Technology, Peking University, Beijing 100871, Lan, Ke, Ye, Wenhua, Center for Applied Physics and Technology, Peking University, Beijing 100871, & Zhang, Weiyan. Effects of the P2 M-band flux asymmetry of laser-driven gold Hohlraums on the implosion of ICF ignition capsule. United States. https://doi.org/10.1063/1.4958811
Li, Yongsheng, Graduate School, China Academy of Engineering Physics, Beijing 100088, Gu, Jianfa, Wu, Changshu, Song, Peng, Dai, Zhensheng, Li, Shuanggui, Li, Xin, Kang, Dongguo, Gu, Peijun, Zheng, Wudi, Zou, Shiyang, Ding, Yongkun, Center for Applied Physics and Technology, Peking University, Beijing 100871, Lan, Ke, Ye, Wenhua, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Zhang, Weiyan. Fri . "Effects of the P2 M-band flux asymmetry of laser-driven gold Hohlraums on the implosion of ICF ignition capsule". United States. https://doi.org/10.1063/1.4958811.
@article{osti_22599998,
title = {Effects of the P2 M-band flux asymmetry of laser-driven gold Hohlraums on the implosion of ICF ignition capsule},
author = {Li, Yongsheng and Graduate School, China Academy of Engineering Physics, Beijing 100088 and Gu, Jianfa and Wu, Changshu and Song, Peng and Dai, Zhensheng and Li, Shuanggui and Li, Xin and Kang, Dongguo and Gu, Peijun and Zheng, Wudi and Zou, Shiyang and Ding, Yongkun and Center for Applied Physics and Technology, Peking University, Beijing 100871 and Lan, Ke and Ye, Wenhua and Center for Applied Physics and Technology, Peking University, Beijing 100871 and Zhang, Weiyan},
abstractNote = {Low-mode asymmetries in the laser-indirect-drive inertial confinement fusion implosion experiments conducted on the National Ignition Facility [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] are deemed the main obstacles hindering further improvement of the nuclear performance of deuterium-tritium-layered capsules. The dominant seeds of these asymmetries include the P2 and P4 asymmetries of x-ray drives and P2 asymmetry introduced by the supporting “tent.” Here, we explore the effects of another possible seed that can lead to low-mode asymmetric implosions, i.e., the M-band flux asymmetry (MFA) in laser-driven cylindrical gold Hohlraums. It is shown that the M-band flux facilitates the ablation and acceleration of the shell, and that positive P2 MFAs can result in negative P2 asymmetries of hot spots and positive P2 asymmetries of shell's ρR. An oblate or toroidal hot spot, depending on the P2 amplitude of MFA, forms at stagnation. The energy loss of such a hot spot via electron thermal conduction is seriously aggravated not only due to the enlarged hot spot surface but also due to the vortices that develop and help transferring thermal energy from the hotter center to the colder margin of such a hot spot. The cliffs of nuclear performance for the two methodologies of applying MFA (i.e., symmetric flux in the presence of MFA and MFA added for symmetric soft x-ray flux) are obtained locating at 9.5% and 5.0% of P2/P0 amplitudes, respectively.},
doi = {10.1063/1.4958811},
url = {https://www.osti.gov/biblio/22599998}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 23,
place = {United States},
year = {2016},
month = {7}
}