论文标题
局部单色两步非线性三叉戟在平面波中
Locally monochromatic two-step nonlinear trident process in a plane wave
论文作者
论文摘要
在中间强度处的多循环平面波中，非线性三叉戟过程可以通过偏振实际光子的非线性康普顿散射的两个顺序步骤来良好，然后通过非线性breit-wheeler对创建将其转换为电子 - 尖齿对。我们通过在每个步骤中使用局部单色近似和数值评估结果表达式来研究中间强度制度中的这一两步过程。当包括光子极化时，发现三叉戟速率下降10％：极力强度下极化的重要性增加，并且在较高强度下降低。它的重要性在线性偏振的背景下持续在较高强度下，但在圆形的背景下在高强度下消失。如果将两个步骤用于具有垂直极化的两个线性偏振的平面波脉冲，则对两种具有相同极化的平面波，这对屈服的产量可以增加约30％。还表明，如果康普顿边缘的线性Breit轮毂的阈值能量的能量，则可以将谐波结构传递给对步骤。
In many-cycle plane waves at intermediate intensities, the nonlinear trident process can be well-approximated by the two sequential steps of nonlinear Compton scattering of a polarised real photon followed by its transformation into an electron-positron pair via nonlinear Breit-Wheeler pair creation. We investigate this two-step process in the intermediate intensity regime by employing the locally monochromatic approximation for each step and numerically evaluating resulting expressions. When photon polarisation is included, it is found to produce an order 10% decrease in the trident rate: the importance of polarisation increases at lower intensities, and decreases at higher intensities. Its importance persists at higher intensities in a linearly-polarised background, but disappears at high intensities in a circularly-polarised background. If the two steps are made to take place in two linearly-polarised plane wave pulses with perpendicular polarisations, the pair yield can be increased by approximately 30% compared to two plane waves with the same polarisation. It is also shown that harmonic structures in the Compton step can be passed to the pair step if the Compton edge is at an energy of the order of the threshold for linear Breit-Wheeler.
