Multistaged positron acceleration with beam driving diffraction radiation

doi:10.1007/s11433-025-2897-9

2026-03-19

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DOI：10.1007/s11433-025-2897-9

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近期研究表明，相干过渡辐射（CTR）可有效将正电子加速至高能量。然而，CTR场在真空中传播时倾向于发散和减弱，这会不利地影响正电子在长距离上的能量增益。在此，我们提出了一种基于衍射辐射（DRs）的多级正电子加速方法，该方法利用高能驱动电子束通过一系列周期性衍射孔径（PDAs）产生的衍射辐射。产生的DR能够将能量注入初始CTR场，CTR和DR场的叠加形成一种混合强加速场，可维持更长的距离。我们的粒子在网格（PIC）模拟显示，DR与CTR的组合可提供高达8.7 GV/m的加速梯度，并能够捕获和加速正电子数厘米。我们演示了，使用100-MeV驱动电子束，尾随正电子可从2 MeV加速至137 MeV，能量分散为1.7%。与无周期性孔径的情况相比，能量增益几乎提高了三倍。该方案可使用激光驱动源提供的电子束运行，从而为未来实现全光台式正电子加速器提供有效途径。

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Science China Physics, Mechanics & Astronomy

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