Kinetic effects of inverse bremsstrahlung absorption in the low-field limit

Zhang S. T.; Wang Qing; Liu D. J.; Cheng R. J.; Li X. X.; Lv S. Y.; Huang Z. M.; Chen Z. J.; Xu Z. Y.; Wang Qiang; Liu Z. J.; Cao L. H.; Zheng C. Y.

doi:10.1063/5.0271079

Volume 10 Issue 6

Nov. 2025

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Article Navigation > Matter and Radiation at Extremes > 2025 > 10(6): 067402

Zhang S. T., Wang Qing, Liu D. J., Cheng R. J., Li X. X., Lv S. Y., Huang Z. M., Chen Z. J., Xu Z. Y., Wang Qiang, Liu Z. J., Cao L. H., Zheng C. Y.. Kinetic effects of inverse bremsstrahlung absorption in the low-field limit[J]. Matter and Radiation at Extremes, 2025, 10(6): 067402. doi: 10.1063/5.0271079

Citation:

Zhang S. T., Wang Qing, Liu D. J., Cheng R. J., Li X. X., Lv S. Y., Huang Z. M., Chen Z. J., Xu Z. Y., Wang Qiang, Liu Z. J., Cao L. H., Zheng C. Y.. Kinetic effects of inverse bremsstrahlung absorption in the low-field limit[J]. Matter and Radiation at Extremes, 2025, 10(6): 067402. doi: 10.1063/5.0271079

Citation:

Zhang S. T., Wang Qing, Liu D. J., Cheng R. J., Li X. X., Lv S. Y., Huang Z. M., Chen Z. J., Xu Z. Y., Wang Qiang, Liu Z. J., Cao L. H., Zheng C. Y.. Kinetic effects of inverse bremsstrahlung absorption in the low-field limit[J]. Matter and Radiation at Extremes, 2025, 10(6): 067402. doi: 10.1063/5.0271079

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Kinetic effects of inverse bremsstrahlung absorption in the low-field limit

doi: 10.1063/5.0271079

Zhang S. T.^1
,,
Wang Qing^1
,,
Liu D. J.^1
,,
Cheng R. J.^1
,,
Li X. X.^1
,,
Lv S. Y.^1
,,
Huang Z. M.^1
,,
Chen Z. J.²,
Xu Z. Y.^1
,,
Wang Qiang¹,
Liu Z. J.^{1, 3
,},
Cao L. H.^{1, 3
,
,
,},
Zheng C. Y.^{1, 3
,}

1.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, People’s Republic of China
2.
Center for Applied Physics and Technology, HEDPS, and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People’s Republic of China
3.
Center for Applied Physics and Technology, HEDPS, and College of Engineering, Peking University, Beijing 100871, People’s Republic of China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: cao_lihua@iapcm.ac.cn
Received Date: 2025-03-14
Accepted Date: 2025-09-23

Available Online: 2025-11-28

Publish Date: 2025-11-01

Abstract

Abstract

Inverse bremsstrahlung absorption in laser-heated plasmas is studied using the Fokker–Planck equation in the low-field limit. Compared with the commonly used fitting formulas of Langdon and Matte et al., our work employs fewer approximations and provides more accurate predictions for the super-Gaussian order β and the heating rate. Simulation results show that the super-Gaussian order is generally lower than the fitting results of Matte et al., which leads to an increase in absorption. However, we find two other factors that reduce absorption: the high-order term of the collision frequency and the effects caused by high laser intensity. Therefore, the final simulated absorption can either be higher or lower, depending on the conditions. These phenomena are theoretically analyzed using the Fokker–Planck equation. Fitting formulas are proposed for the super-Gaussian order and the heating rate, showing a discrepancy within ∼10% of the simulation results. We also compare the simulation results with the experimental results from several recent papers.

Conflict of Interest
The authors have no conflicts to disclose.
Author Contributions
S. T. Zhang: Data curation (equal); Formal analysis (equal); Funding acquisition (equal); Investigation (equal); Methodology (equal); Visualization (equal); Writing – original draft (equal). Qing Wang: Formal analysis (equal). D. J. Liu: Formal analysis (supporting). R. J. Cheng: Formal analysis (supporting). X. X. Li: Formal analysis (supporting). S. Y. Lv: Formal analysis (supporting). Z. M. Huang: Formal analysis (supporting). Z. J. Chen: Formal analysis (supporting); Software (equal). Z. Y. Xu: Formal analysis (supporting). Qiang Wang: Formal analysis (equal); Supervision (equal). Z. J. Liu: Conceptualization (equal); Formal analysis (equal); Funding acquisition (equal); Project administration (equal); Resources (equal); Supervision (equal); Writing – review & editing (equal). L. H. Cao: Formal analysis (equal); Funding acquisition (equal); Project administration (equal); Resources (equal); Supervision (equal); Writing – review & editing (equal). C. Y. Zheng: Formal analysis (equal); Funding acquisition (equal); Project administration (equal); Supervision (equal).
The data that support the findings of this study are available from the corresponding author upon reasonable request.

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References(33)

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