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Influence of Au M-band flux asymmetry on implosion symmetry

Published online by Cambridge University Press:  17 April 2017

S. Jiang ,
L. Li ,
L. Jing ,
L. Kuang ,
H. Li ,
L. Zhang ,
Z. Lin  and
Y. Ding
S. Jiang*
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China Center for Applied Physics and Technology, Peking University, Beijing, 100871, People's Republic of China
L. Li
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
L. Jing
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
L. Kuang
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
H. Li
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
L. Zhang
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
Z. Lin
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China
Y. Ding
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China Center for Applied Physics and Technology, Peking University, Beijing, 100871, People's Republic of China
*
Address correspondence and reprint requests to: S. Jiang, Research Center of Laser Fusion, China Academy of Engineering Physics, P. O. Box 919-986, Mianyang, 621900, People's Republic of China. E-mail: jiangshn@vip.sina.com
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Abstract

In indirect-drive inertial confinement fusion, the radiation symmetry must be controlled for the achievement of hotspot ignition. The radiation symmetry is of great importance. In this paper, we investigate the drive asymmetry of the M-band (2–5 keV) radiation emitted from an Au holhraum wall by using the three-dimensional view-factor code IRAD3D. Analysis of the M-band flux drive at the Shenguang-III laser facility shows that it is asymmetric and that the asymmetry varies with time. For a given cross section over the pole, the initial M-band flux asymmetries are P2 = 11.59, P4 = 1.41, and P6 = −0.64%. When the asymmetries are artificially added to a symmetric radiation drive, the position of the deuterium-tritium (DT) ice/gas interface is asymmetric for a National Ignition Facility capsule in 1D simulation. This means that M-band flux asymmetry can lead to implosion asymmetry even if the total radiation is symmetric. Pure CH and Si-doped CH capsules are considered. The results show that a mid-Z dopant can partly reduce the asymmetry. However, the asymmetry is still very large. Thus, it is necessary to study the M-band flux asymmetry and its influence on the implosion symmetry.

Keywords

HolhraumAu M-bandFlux asymmetryPure CH and Si-doped CH capsulesImplosion symmetry
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 2 , June 2017 , pp. 337 - 343
Copyright
Copyright © Cambridge University Press 2017 

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