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Volume 2 Issue 2
Mar.  2017
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Article Navigation >  Matter and Radiation at Extremes  > 2017  >  2(2): 
Li Yongsheng, Zhai Chuanlei, Ren Guoli, Gu Jianfa, Huo Wenyi, Meng Xujun, Ye Wenhua, Lan Ke, Zhang Weiyan. P2 asymmetry of Au's M-band flux and its smoothing effect due to high-Z ablator dopants[J]. Matter and Radiation at Extremes, 2017, 2(2). doi: 10.1016/j.mre.2016.12.001
Citation: Li Yongsheng, Zhai Chuanlei, Ren Guoli, Gu Jianfa, Huo Wenyi, Meng Xujun, Ye Wenhua, Lan Ke, Zhang Weiyan. P2 asymmetry of Au's M-band flux and its smoothing effect due to high-Z ablator dopants[J]. Matter and Radiation at Extremes, 2017, 2(2). doi: 10.1016/j.mre.2016.12.001
shu

P2 asymmetry of Au's M-band flux and its smoothing effect due to high-Z ablator dopants

doi: 10.1016/j.mre.2016.12.001
  • 1.

    aInstitute of Applied Physics and Computational Mathematics, Beijing 100094, China

  • 2.

    bGraduate School, China Academy of Engineering Physics, Beijing 100088, China

  • 3.

    cCenter for Applied Physics and Technology, Peking University, Beijing 100871, China

  • 4.

    dCollaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China

  • 5.

    eChina Academy of Engineering Physics, Mianyang 621900, China

More Information
  • Corresponding author: *Corresponding author. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China. E-mail address: li_yongsheng@iapcm.ac.cn (Y.S. Li).
  • Received Date: 2016-08-20
  • Accepted Date: 2016-12-05
    • Available Online: 2021-12-07
  • Publish Date: 2017-03-15
    Abstract
  • X-ray drive asymmetry is one of the main seeds of low-mode implosion asymmetry that blocks further improvement of the nuclear performance of “high-foot” experiments on the National Ignition Facility [Miller et al., Nucl. Fusion 44, S228 (2004)]. More particularly, the P2 asymmetry of Au's M-band flux can also severely influence the implosion performance of ignition capsules [Li et al., Phys. Plasmas 23, 072705 (2016)]. Here we study the smoothing effect of mid- and/or high-Z dopants in ablator on Au's M-band flux asymmetries, by modeling and comparing the implosion processes of a Ge-doped ignition capsule and a Si-doped one driven by X-ray sources with P2 M-band flux asymmetry. As the results, (1) mid- or high-Z dopants absorb hard X-rays (M-band flux) and re-emit isotropically, which helps to smooth the asymmetric M-band flux arriving at the ablation front, therefore reducing the P2 asymmetries of the imploding shell and hot spot; (2) the smoothing effect of Ge-dopant is more remarkable than Si-dopant because its opacity in Au's M-band is higher than the latter's; and (3) placing the doped layer at a larger radius in ablator is more efficient. Applying this effect may not be a main measure to reduce the low-mode implosion asymmetry, but might be of significance in some critical situations such as inertial confinement fusion (ICF) experiments very near the performance cliffs of asymmetric X-ray drives.
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