非均匀磁场等离子体中倾斜共振下的电磁波吸收
Absorption of electromagnetic waves at oblique resonance in plasmas threaded by inhomogenous magnetic fields
AI总结：
本文研究了电磁波在非均匀磁场等离子体中以倾斜角度传播时的共振吸收现象，通过OSIRIS 4.0二维PIC模拟发现等离子体几乎完全吸收了激光能量，并详细表征了磁场分布和波强对吸收的作用。
摘要：
近期，电磁（EM）波与磁化等离子体相互作用的研究引起了广泛关注。不同磁场取向的色散曲线中存在多种共振及若干通带和阻带，为EM波能量吸收提供了新机制。然而，早期研究仅探讨了磁化等离子体几何构型的特例（如RL模式 $(\vec{k}||\vec{B}_{ext}$) 或 $(\vec{k}\perp\vec{B}_{ext})$ 的 X、O 模式构型）。在这些特定情形下，EM波会遭遇特定共振（如 $(θ=0)$ 时的回旋共振，及 $(θ=π/2)$ 时的混合共振）。本文考虑了EM波相对于外加磁场 $\vec{B}_{ext}$ 以倾斜角度传播的一般情形。此外，选取非均匀磁场，使得EM波脉冲在等离子体介质内遭遇共振层。利用 OSIRIS 4.0 平台开展了二维 Particle-In-Cell (PIC) 模拟。观察到吸收显著增强，导致等离子体几乎完全吸收了激光能量。同时进行了详细研究，表征了外加磁场分布、EM波强度等的作用。
英文摘要：
There has been significant interest lately in the study of Electromagnetic (EM) waves interacting with magnetized plasmas. The variety of resonances and the existence of several pass and stop bands in the dispersion curve for different orientations of the magnetic field offer new mechanisms of EM wave energy absorption \cite{PhysRevE.105.055209,Juneja_2023,vashistha2020new}. However, earlier studies have investigated only special cases of magnetized plasma geometry (e.g., RL mode $(\vec{k}||\vec{B}_{ext}$) or $(\vec{k}\perp\vec{B}_{ext})$ X,O-mode configuration). In these specific cases, EM waves encounter specific resonances (e.g. for $(θ=0)$ cyclotron resonances, and for $(θ=π/2)$, hybrid resonances). A general case of EM wave propagation is at an oblique angle with respect to the externally applied magnetic field $\vec{B}_{ext}$ has been considered here. Furthermore, the magnetic field is chosen to be inhomogeneous such that the EM wave pulse encounters a resonance layer within the plasma medium. A 2-D Particle-In-Cell (PIC) simulation using the OSIRIS 4.0 platform has been carried out for these studies. A significant enhancement in absorption leading to almost complete absorption of laser energy by the plasma has been observed. A detailed study characterizing the role of the external magnetic field profile, EM wave intensity, etc., has also been carried out.
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