中国物理B ›› 2025, Vol. 34 ›› Issue (11): 115203-115203.doi: 10.1088/1674-1056/addcd0

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Impact of mass concentration variations on plasma dynamics in a laser-ablated CH target

Hafiz Muhammad Siddique1,2, Guannan Zheng(郑冠男)1,2, Tao Tao(陶弢)1,2, Xiao-Bao Jia(贾晓宝)1,2, and Jian Zheng(郑坚)1,2,3,†   

  1. 1 Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China, Hefei 230026, China;
    2 Chinese Academy of Sciences (CAS) Key Laboratory of Frontier Physics in Controlled Nuclear Fusion, University of Science and Technology of China, Hefei 230026, China;
    3 Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • 收稿日期:2025-03-09 修回日期:2025-04-29 接受日期:2025-05-26 出版日期:2025-10-30 发布日期:2025-11-24
  • 通讯作者: Jian Zheng E-mail:jzheng@ustc.edu.cn
  • 基金资助:
    Project supported by the National Nature Science Foundation of China (Grant No. 12375242) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA25010200).

Impact of mass concentration variations on plasma dynamics in a laser-ablated CH target

Hafiz Muhammad Siddique1,2, Guannan Zheng(郑冠男)1,2, Tao Tao(陶弢)1,2, Xiao-Bao Jia(贾晓宝)1,2, and Jian Zheng(郑坚)1,2,3,†   

  1. 1 Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China, Hefei 230026, China;
    2 Chinese Academy of Sciences (CAS) Key Laboratory of Frontier Physics in Controlled Nuclear Fusion, University of Science and Technology of China, Hefei 230026, China;
    3 Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2025-03-09 Revised:2025-04-29 Accepted:2025-05-26 Online:2025-10-30 Published:2025-11-24
  • Contact: Jian Zheng E-mail:jzheng@ustc.edu.cn
  • Supported by:
    Project supported by the National Nature Science Foundation of China (Grant No. 12375242) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA25010200).

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摘要： Laser-produced plasmas in the field of inertial confinement fusion usually consist of multiple ion species with different atomic numbers and charge-to-mass ratios. With the presence of various plasma gradients, ion diffusion is driven, causing ion concentration to evolve and deviate from its initial value. In order to investigate the effect of ion diffusion on laser-produced plasmas, we implement an ion diffusion module within the radiation-hydro code MULTI-1D [Comput. Phys. Commun. 203 226 (2016)]. Under the planar target geometry and simulation parameters considered in this study, ion species separation primarily occurs near ablation front and underdense region. Although ion diffusion just has a slight impact on plasma hydrodynamics such as density, temperature and pressure profiles, it could have significant influence on the processes in relevant to ion-acoustic wave, whose damping rate depends sensitively on ion concentration. It is found that the coupling factor of cross-beam energy transfer (CBET) could change a lot when ion diffusion is taken into account, indicating that ion diffusion could play important role in laser fusion.

关键词: mass diffusion, ion transport, species separation, hydrodynamic simulation

Abstract: Laser-produced plasmas in the field of inertial confinement fusion usually consist of multiple ion species with different atomic numbers and charge-to-mass ratios. With the presence of various plasma gradients, ion diffusion is driven, causing ion concentration to evolve and deviate from its initial value. In order to investigate the effect of ion diffusion on laser-produced plasmas, we implement an ion diffusion module within the radiation-hydro code MULTI-1D [Comput. Phys. Commun. 203 226 (2016)]. Under the planar target geometry and simulation parameters considered in this study, ion species separation primarily occurs near ablation front and underdense region. Although ion diffusion just has a slight impact on plasma hydrodynamics such as density, temperature and pressure profiles, it could have significant influence on the processes in relevant to ion-acoustic wave, whose damping rate depends sensitively on ion concentration. It is found that the coupling factor of cross-beam energy transfer (CBET) could change a lot when ion diffusion is taken into account, indicating that ion diffusion could play important role in laser fusion.

Key words: mass diffusion, ion transport, species separation, hydrodynamic simulation

中图分类号:  (Laser inertial confinement)

  • 52.57.-z
52.38.-r (Laser-plasma interactions) 52.25.Dg (Plasma kinetic equations) 52.30.Ex (Two-fluid and multi-fluid plasmas)