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Title: Novel spherical hohlraum with cylindrical laser entrance holes and shields

Abstract

Our recent works [K. Lan et al., Phys. Plasmas 21, 010704 (2014); K. Lan et al., Phys. Plasmas 21, 052704 (2014)] have shown that the octahedral spherical hohlraums are superior to the cylindrical hohlraums in both higher symmetry during the capsule implosion and lower backscatter without supplementary technology. However, both the coupling efficiency from the drive laser energy to the capsule and the capsule symmetry decrease remarkably when larger laser entrance holes (LEHs) are used. In addition, the laser beams injected at angles > 45° transport close to the hohlraum wall, thus the wall blowoff causes the LEH to close faster and results in strong laser plasma interactions inside the spherical hohlraums. In this letter, we propose a novel octahedral hohlraum with LEH shields and cylindrical LEHs to alleviate these problems. From our theoretical study, with the LEH shields, the laser coupling efficiency is significantly increased and the capsule symmetry is remarkably improved in the spherical hohlraums. The cylindrical LEHs take advantage of the cylindrical hohlraum near the LEH and mitigate the influence of the blowoff on laser transport inside a spherical hohlraum. The cylindrical LEHs can also be applied to the rugby and elliptical hohlraums.

Authors:
 [1];  [2];  [1]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22303608
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; 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; BLOWOFF; CAPSULES; CYLINDRICAL CONFIGURATION; EFFICIENCY; IMPLOSIONS; LASERS; LOCAL AREA NETWORKS; PLASMA; SHIELDS; SPHERICAL CONFIGURATION; SYMMETRY

Citation Formats

Lan, Ke, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Zheng, Wudi. Novel spherical hohlraum with cylindrical laser entrance holes and shields. United States: N. p., 2014. Web. doi:10.1063/1.4895503.
Lan, Ke, Center for Applied Physics and Technology, Peking University, Beijing 100871, & Zheng, Wudi. Novel spherical hohlraum with cylindrical laser entrance holes and shields. United States. doi:10.1063/1.4895503.
Lan, Ke, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Zheng, Wudi. Mon . "Novel spherical hohlraum with cylindrical laser entrance holes and shields". United States. doi:10.1063/1.4895503.
@article{osti_22303608,
title = {Novel spherical hohlraum with cylindrical laser entrance holes and shields},
author = {Lan, Ke and Center for Applied Physics and Technology, Peking University, Beijing 100871 and Zheng, Wudi},
abstractNote = {Our recent works [K. Lan et al., Phys. Plasmas 21, 010704 (2014); K. Lan et al., Phys. Plasmas 21, 052704 (2014)] have shown that the octahedral spherical hohlraums are superior to the cylindrical hohlraums in both higher symmetry during the capsule implosion and lower backscatter without supplementary technology. However, both the coupling efficiency from the drive laser energy to the capsule and the capsule symmetry decrease remarkably when larger laser entrance holes (LEHs) are used. In addition, the laser beams injected at angles > 45° transport close to the hohlraum wall, thus the wall blowoff causes the LEH to close faster and results in strong laser plasma interactions inside the spherical hohlraums. In this letter, we propose a novel octahedral hohlraum with LEH shields and cylindrical LEHs to alleviate these problems. From our theoretical study, with the LEH shields, the laser coupling efficiency is significantly increased and the capsule symmetry is remarkably improved in the spherical hohlraums. The cylindrical LEHs take advantage of the cylindrical hohlraum near the LEH and mitigate the influence of the blowoff on laser transport inside a spherical hohlraum. The cylindrical LEHs can also be applied to the rugby and elliptical hohlraums.},
doi = {10.1063/1.4895503},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 21,
place = {United States},
year = {2014},
month = {9}
}