论文标题
通过重塑碰撞脉冲来改善全光康普顿$γ$ rays源
Improvement of all-optical Compton $γ$-rays source by reshaping colliding pulse
论文作者
论文摘要
全光康普顿散射是产生高质量$γ$辐射源的非凡方法。通过使用基于激光Wakefield加速器的脉冲，在实验中更容易实现。当Wakefield加速阶段结束时，驱动激光会向后反射，因此自然会与能量电子碰撞。为了增加反射的脉冲强度，通常采用抛物线焦点等离子体镜，而不是反射目标。但是，凹陷的镜子也会恶化发出的光子束单色性和准确性。我们建议使用阶梯化的聚焦等离子镜来反映驱动脉冲来征服这些问题。通过阶梯靶标的反射脉冲的纵向长度更大，强度相对较小。它导致发射的光子束具有更好的单色性和准确性，除了具有较大的发射能和更高的激光利用效率。我们肯定了通过各种数值模拟来反映策略的阶梯式聚焦镜的鲁棒性。
All-optical Compton scattering is a remarkable method of generating high-quality $γ$ radiation source. It is easier achieved in experiment by employing a pulse based on laser wakefield accelerator. The driving laser is backward reflected when wakefield acceleration stage is over and thus it naturally collides with energetic electrons. To increase reflected pulse intensity, parabolic focusing plasma mirror instead of flat reflecting target is usually adopted. But concave focusing mirror also deteriorates the emitted photon beam monochromaticity and collimation. We propose using stepped focusing plasma mirror to reflect the driving pulse to conquer these issues. The longitudinal length of reflected pulse by stepped target is larger and intensity is relatively small. It leads emitted photon beam to have better monochromaticity and collimation except for having larger emitted energy and higher laser utilization efficiency. We affirm the robustness of stepped focusing mirror reflecting regime through various kinds of numerical simulations.
