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arXiv 2602.22172physics.plasm-phphysics.acc-ph
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高强度和相位分布对高电荷激光等离子体加速的影响

Effects of realistic laser intensity and phase distribution on high-charge laser wakefield acceleration

Peking University(北京大学)
Yuhui Xia, Zhenan Wang, Ziyao Tang, Jianghao Hu, Qianyi Ma, Yuekai Chen, Letian Liu, Zhiyan Yang, Hui Zhang, Chenxu Wang, Haoyang Lan, Di Wu, Xiuhong Yang, Yixi… 展开作者

Yuhui Xia, Zhenan Wang, Ziyao Tang, Jianghao Hu, Qianyi Ma, Yuekai Chen, Letian Liu, Zhiyan Yang, Hui Zhang, Chenxu Wang, Haoyang Lan, Di Wu, Xiuhong Yang, Yixing Geng, Yanying Zhao, Xueqin Yan, Xinlu Xu

AI总结:

本研究通过实验和模拟揭示了非理想激光脉冲对高电荷激光等离子体加速的影响,发现其注入效率与高斯脉冲存在显著差异。

摘要:

激光等离子体加速(LWFA)可以在厘米长度的等离子体中产生相对论电子束和各种次级粒子,使其成为一种有价值的粒子源,在许多学科中具有重要的应用。在本工作中,我们通过实验测量和粒子-细胞模拟,研究了非理想横向强度和相位分布的激光脉冲对LWFA的影响。75 TW激光脉冲的复杂横向剖面相比横向高斯激光脉冲降低了等离子体中的自聚焦强度。此外,由现实激光脉冲激发的非线性等离子体波的鞘结构比高斯激光更宽且更复杂。这些因素阻碍了等离子体电子的注入。当激光脉冲通过等离子体传播时,其强度剖面逐渐变得椭圆,驱动了一个具有尖锐鞘层的等离子体波,靠近主轴方位,导致注入。当在模拟中使用现实激光剖面时,注入电子的电荷和能量与实验结果(约200 pC的电荷和约200 MeV的峰值能量)非常接近,而高斯激光模拟产生的电荷要高得多(约500 pC)。我们的发现揭示了由非理想激光脉冲驱动的LWFA与由高斯脉冲驱动的LWFA在注入动力学上的差异,并且对于需要高电荷电子束的LWFA应用具有实用价值。

英文摘要:

Laser wakefield acceleration (LWFA) can produce relativistic electron beams and various secondary particles in centimeter-long plasmas, making it a valuable particle source with important applications in many disciplines. In this work, we examine the effects of non-ideal transverse intensity and phase distribution of laser pulses on LWFA through both experimental measurements and particle-in-cell simulations. The complex transverse profile of the 75 TW laser pulses reduces the self-focused intensity in plasma compared with a transversely Gaussian laser. Furthermore, the sheath structure of the nonlinear plasma wake excited by realistic laser pulses is wider and more complicated than that of a Gaussian laser. These hinder the injection of the plasma electrons. As the laser pulse propagates through the plasma, its intensity profile gradually becomes elliptical and drives a plasma wake with a sharp sheath near the azimuths of the major axis, leading to an injection. When using a realistic laser profile in simulations, both the charge and energy of injected electrons closely match experimental results ($\sim200$ pC of charge and $\sim 200$ MeV peak energy), whereas the Gaussian laser simulations produce much higher charge ($\sim500$ pC). Our findings reveal the difference in injection dynamics between LWFA driven by non-ideal laser pulses and those driven by Gaussian pulses, and are useful for applications of LWFA which demand high-charge electron beams.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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