中国物理B ›› 2016, Vol. 25 ›› Issue (8): 85202-085202.doi: 10.1088/1674-1056/25/8/085202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

A new ignition hohlraum design for indirect-drive inertial confinement fusion

Xin Li(李欣), Chang-Shu Wu(吴畅书), Zhen-Sheng Dai(戴振生), Wu-Di Zheng(郑无敌), Jian-Fa Gu(谷建法), Pei-Jun Gu(古培俊), Shi-Yang Zou(邹士阳), Jie Liu(刘杰), Shao-Ping Zhu(朱少平)   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • 收稿日期:2016-05-16 修回日期:2016-06-02 出版日期:2016-08-05 发布日期:2016-08-05
  • 通讯作者: Zhen-Sheng Dai E-mail:dai_zhensheng@iapcm.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11435011 and 11575034).

A new ignition hohlraum design for indirect-drive inertial confinement fusion

Xin Li(李欣), Chang-Shu Wu(吴畅书), Zhen-Sheng Dai(戴振生), Wu-Di Zheng(郑无敌), Jian-Fa Gu(谷建法), Pei-Jun Gu(古培俊), Shi-Yang Zou(邹士阳), Jie Liu(刘杰), Shao-Ping Zhu(朱少平)   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • Received:2016-05-16 Revised:2016-06-02 Online:2016-08-05 Published:2016-08-05
  • Contact: Zhen-Sheng Dai E-mail:dai_zhensheng@iapcm.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11435011 and 11575034).

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摘要：

In this paper, a six-cylinder-port hohlraum is proposed to provide high symmetry flux on capsule. It is designed to ignite a capsule with 1.2-mm radius in indirect-drive inertial confinement fusion (ICF). Flux symmetry and laser energy are calculated by using three-dimensional view factor method and laser energy balance in hohlraum. Plasma conditions are analyzed based on the two-dimensional radiation-hydrodynamic simulations. There is no Ylm (l≤4) asymmetry in the six-cylinder-port hohlraum when the influences of laser entrance holes (LEHs) and laser spots cancel each other out with suitable target parameters. A radiation drive with 300 eV and good flux symmetry can be achieved by using a laser energy of 2.3 MJ and peak power of 500 TW. According to the simulations, the electron temperature and the electron density on the wall of laser cone are high and low, respectively, which are similar to those of outer cones in the hohlraums on National Ignition Facility (NIF). And the laser intensity is also as low as those of NIF outer cones. So the backscattering due to laser plasma interaction (LPI) is considered to be negligible. The six-cyliner-port hohlraum could be superior to the traditional cylindrical hohlraum and the octahedral hohlraum in both higher symmetry and lower backscattering without supplementary technology at an acceptable laser energy level. It is undoubted that the hohlraum will add to the diversity of ICF approaches.

关键词: ICF, hohlraums, ignition, six-cylinder port

Abstract:

In this paper, a six-cylinder-port hohlraum is proposed to provide high symmetry flux on capsule. It is designed to ignite a capsule with 1.2-mm radius in indirect-drive inertial confinement fusion (ICF). Flux symmetry and laser energy are calculated by using three-dimensional view factor method and laser energy balance in hohlraum. Plasma conditions are analyzed based on the two-dimensional radiation-hydrodynamic simulations. There is no Ylm (l≤4) asymmetry in the six-cylinder-port hohlraum when the influences of laser entrance holes (LEHs) and laser spots cancel each other out with suitable target parameters. A radiation drive with 300 eV and good flux symmetry can be achieved by using a laser energy of 2.3 MJ and peak power of 500 TW. According to the simulations, the electron temperature and the electron density on the wall of laser cone are high and low, respectively, which are similar to those of outer cones in the hohlraums on National Ignition Facility (NIF). And the laser intensity is also as low as those of NIF outer cones. So the backscattering due to laser plasma interaction (LPI) is considered to be negligible. The six-cyliner-port hohlraum could be superior to the traditional cylindrical hohlraum and the octahedral hohlraum in both higher symmetry and lower backscattering without supplementary technology at an acceptable laser energy level. It is undoubted that the hohlraum will add to the diversity of ICF approaches.

Key words: ICF, hohlraums, ignition, six-cylinder port

中图分类号:  (Laser inertial confinement)

  • 52.57.-z
52.57.Bc (Target design and fabrication) 52.38.Dx (Laser light absorption in plasmas (collisional, parametric, etc.))