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<p>This study investigates the dynamics of electron acceleration in laser-plasma accelerators (LPAs) using plasma wakefields driven by a terawatt (TW) few-cycle laser pulse. By employing a designed trapezoidal plasma density profile and leveraging the matched conditions of the bubble regime, we demonstrate wakefield generation and acceleration of electrons with an external injection method. Two dimensions particle-in-cell (2D-PIC) simulations, using the Wake-T tool, were conducted under quasi-static approximations (QSA) to elucidate the electron bunch’s phase space evolution, energy gain, and divergence. The simulation results reveal the generation of quasi-monoenergetic electron beams with improved collimation and reduced divergence. The electron energy distribution demonstrated prominent peaks at specific energy levels, indicating efficient trapping and acceleration. Furthermore, the momentum spectra show high longitudinal momentum with minimal transverse spread, confirming excellent beam quality. Key mechanisms such as relativistic self-focusing, wakefield generation, and beam loading were observed to play pivotal roles in energy transfer and beam stabilization.</p>

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PIC simulation of wakefield generation and electron acceleration in underdense plasma by a TW few-cycle laser pulse

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Mehdi Abedi-Varaki,
  • Mohammad Mirzaie

摘要

This study investigates the dynamics of electron acceleration in laser-plasma accelerators (LPAs) using plasma wakefields driven by a terawatt (TW) few-cycle laser pulse. By employing a designed trapezoidal plasma density profile and leveraging the matched conditions of the bubble regime, we demonstrate wakefield generation and acceleration of electrons with an external injection method. Two dimensions particle-in-cell (2D-PIC) simulations, using the Wake-T tool, were conducted under quasi-static approximations (QSA) to elucidate the electron bunch’s phase space evolution, energy gain, and divergence. The simulation results reveal the generation of quasi-monoenergetic electron beams with improved collimation and reduced divergence. The electron energy distribution demonstrated prominent peaks at specific energy levels, indicating efficient trapping and acceleration. Furthermore, the momentum spectra show high longitudinal momentum with minimal transverse spread, confirming excellent beam quality. Key mechanisms such as relativistic self-focusing, wakefield generation, and beam loading were observed to play pivotal roles in energy transfer and beam stabilization.