Nonlocal thermal transport in magnetized plasma along different directions

Zhao Hanzhi; Sheng Zhengming; Weng Suming

doi:10.1063/5.0086783

Volume 7 Issue 4

Jul. 2022

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Zhao Hanzhi, Sheng Zhengming, Weng Suming. Nonlocal thermal transport in magnetized plasma along different directions[J]. Matter and Radiation at Extremes, 2022, 7(4): 045901. doi: 10.1063/5.0086783

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Zhao Hanzhi, Sheng Zhengming, Weng Suming. Nonlocal thermal transport in magnetized plasma along different directions[J]. Matter and Radiation at Extremes, 2022, 7(4): 045901. doi: 10.1063/5.0086783

Zhao Hanzhi, Sheng Zhengming, Weng Suming. Nonlocal thermal transport in magnetized plasma along different directions[J]. Matter and Radiation at Extremes, 2022, 7(4): 045901. doi: 10.1063/5.0086783

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Nonlocal thermal transport in magnetized plasma along different directions

doi: 10.1063/5.0086783

Zhao Hanzhi^{1, 2
,},
Sheng Zhengming^{1, 2, 3
,},
Weng Suming^{1, 2
,
,
,}

1.
Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2.
Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
3.
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: wengsuming@sjtu.edu.cn
Received Date: 2022-01-28
Accepted Date: 2022-05-15

Available Online: 2022-07-01

Publish Date: 2022-07-01

Abstract

Abstract

Nonlocal thermal transport in magnetized plasmas is studied theoretically and numerically with the Vlasov–Fokker–Planck (VFP) model, in which the magnetic field has nonzero components both perpendicular to and along the temperature gradient. Nonlocal heat transport is found in both the longitudinal and transverse directions, provided the temperature gradients are sufficiently large. The magnetic field tends to reduce the nonlocality of the thermal transport in the direction perpendicular to the magnetic field, i.e., the difference between the heat fluxes predicted by the Braginskii theory and the VFP simulation decreases with increasing magnetic field strength. When the initial temperature gradient is steep, the nonlocal heat flux depends not only on the present temperature profile, but also on its time history. Moreover, the contribution of high-order terms in the spherical harmonic expansion of the electron distribution function becomes important for a magnetized plasma, in particular for thermal transport in the direction perpendicular to the temperature gradient.

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References(51)

References

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