Ablative Rayleigh-Taylor instability (ARTI) plays a crucial role in various astrophysical phenomena, such as supernova explosions, and poses a significant risk in inertial confinement fusion (ICF) implosions. The self-generated magnetic (B) fields produced during the evolution of ARTI not only has significant implications for diagnostics on the deliberate fluid structures, but can also have a profound impact on the hydrodynamic evolution. In this work, self-generated B fields in three-dimensional (3D) single-mode ARTI, relevant to the acceleration phase of ICF implosions, are investigated through numerical simulations and theoretical analysis. Key physical processes, including ablation effect, Nernst effect, electrical resistance, and magnetized heat conduction, are incorporated to provide a more realistic physics depiction. In 3D single-mode ARTI, it is found that stronger B fields up to a few thousand T can be generated compared to two-dimensional (2D) single-mode ARTI [1]. The Nernst effect suppresses the transport of the 3D B field into the bubble, resulting in the strongest B field in the ablation region near the 3D spike tip. The magnetized heat flux along the opposite direction of the temperature gradient near the spike tip is noticeably suppressed, and the Righi-Leduc heat flux also transports heat into the bubble. These effects weaken the ablative stabilization at the 3D spike tip, leading to acceleration of 3D spike growth. While the B field significantly accelerates the bubble growth in the short-wavelength 2D ARTI, the B field mostly accelerates the spike growth but has little impact on the bubble growth in 3D ARTI [2].

[1] D. Zhang, J. Li, J. Xin, R. Yan, Z. Wan, H. Zhang, J. Zheng, Physics of Plasmas 29, 07270207 (2022).
[2] D. Zhang, X. Jiang, T. Tao, J. Li, R. Yan, D. Sun, J. Zheng, Journal of Fluid Mechanics 1000, A94 (2024).
 

ablative Rayleigh-Taylor instability,Self-generated magnetic field,Magnetized heat conduction