2026年“核理安邦”联合博士生学术论坛

飞秒激光驱动高密度等离子体的betatron辐射源模拟

Not scheduled

1h

地址：清华大学校内

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Speaker

恒 王

Abstract

Laser wakefield acceleration in high-density plasma can produce elec-tron beams with higher charge, thereby enhancing the yield of betatron radiation. In this study, the EPOCH code was employed to simulate the generation of high-energy electron beams via femtosecond laser-driven wakefield acceleration, as well as the Xray emission resulting from electron beam oscillations. The pulse duration of the generated X-rays is comparable to that of the driving laser, enabling the generation of high-yield X-rays with a time scale of less than 30 femtoseconds in a single shot. It was found that, under normal conditions, increasing the plasma density leads to a larger divergence angle of the emitted X-rays. Moreover, we compare the X-ray generation processes when lasers interact with different target materials. The results show that, within a certain range, an increase in atomic number contributes positively to the X-ray yield. This study may offer valuable insights for the development of femtosecond laser-driven X-ray sources.

摘要

激光驱动高密度等离子体中产生激光尾场加速，可以获得更大电荷量的电子束，从而得到提高betatron辐射产额的可能性。本文利用EPOCH模拟了飞秒激光驱动尾场加速产生高能电子束以及电子束振荡产生的X射线。X射线的脉冲宽度与驱动激光的脉冲宽度相当，因此单次能够产生时间尺度在30飞秒以内的高产额X射线。研究发现，增加等离子体密度一般情况下会增加出射X射线的散角。本文对比了激光驱动时不同材料时产生的X射线的过程。研究表明，在一定范围内，原子序数的提高有助于X射线产额的提高。本研究可以为推进飞秒激光驱动X射线源的实验提供参考。