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<p>The manipulation of laser-plasma coupling by external magnetic fields offers a&#xa0;practical route to improve energy localization in laser-driven fusion schemes. Here we present a&#xa0;combined analytical-computational study of circularly polarized Ti:sapphire laser pulses interacting with magnetized p‑11B plasma. An analytical model based on plasma-block acceleration is used alongside two-dimensional particle-in-cell (EPOCH-2D) simulations to investigate how externally applied axial magnetic fields alter beam propagation, self-focusing and particle confinement. Representative simulation cases at unmagnetized and magnetized conditions (including B<sub>0</sub> = 0, 10 and 20 T) show that magnetic confinement reduces transverse beam spread, enhances on-axis energy deposition, and mitigates transverse instabilities that otherwise broaden the beam. We quantify these trends through the minimum beam waist and the onset threshold for strong self-focusing, and discuss implications for tailoring laser drivers in aneutronic p‑11B schemes. The manuscript emphasizes reproducible simulation settings and provides practical metrics for experimental benchmarking and future 3D extensions.</p>

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Magnetic-field-controlled beam confinement and self-focusing of circularly polarized laser pulses in magnetized p-11B plasma: 2D PIC simulations

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Fatemeh Shahi,
  • Mehdi Sharifian,
  • Soheil Khoshbinfar

摘要

The manipulation of laser-plasma coupling by external magnetic fields offers a practical route to improve energy localization in laser-driven fusion schemes. Here we present a combined analytical-computational study of circularly polarized Ti:sapphire laser pulses interacting with magnetized p‑11B plasma. An analytical model based on plasma-block acceleration is used alongside two-dimensional particle-in-cell (EPOCH-2D) simulations to investigate how externally applied axial magnetic fields alter beam propagation, self-focusing and particle confinement. Representative simulation cases at unmagnetized and magnetized conditions (including B0 = 0, 10 and 20 T) show that magnetic confinement reduces transverse beam spread, enhances on-axis energy deposition, and mitigates transverse instabilities that otherwise broaden the beam. We quantify these trends through the minimum beam waist and the onset threshold for strong self-focusing, and discuss implications for tailoring laser drivers in aneutronic p‑11B schemes. The manuscript emphasizes reproducible simulation settings and provides practical metrics for experimental benchmarking and future 3D extensions.