论文标题
$γ$ - $γ$电子旋律对的优势在高强度激光器驱动的等离子体中创建
Dominance of $γ$-$γ$ electron-positron pair creation in a plasma driven by high-intensity lasers
论文作者
论文摘要
单独从光中创建电子和正电子是量子电动力学的基本预测，但尚未观察到。在这里，我们表明，可以通过对结构化等离子体靶的双激光照射创建$ {>} 10^8 $上调，以$ 2 \ times 10^{22} {22} \ mathrm {w} \ Mathrm {w} \ mathrm {cm}^cm}^{cm}^{ - 2} $。与以前的工作相反，这对创建主要是由线性Breit-wheeler工艺（$γγ\ to E^+ E^ - $）驱动的，而不是假定在高强度下占主导地位的非线性过程，因为$γ$射线的高密度在目标内发出。线性过程的激光强度的有利缩放促使其在模拟研究中的忽视重新考虑，但也允许在实验上可行的强度上形成正电子喷射。模拟表明，被激光器可能会加速到耗能$> 200 $ meV，而限制了准确的等离子体磁场。
Creation of electrons and positrons from light alone is a basic prediction of quantum electrodynamics, but yet to be observed. Here we show that it is possible to create ${>}10^8$ positrons by dual laser irradiation of a structured plasma target, at intensities of $2 \times 10^{22} \mathrm{W}\mathrm{cm}^{-2}$. In contrast to previous work, the pair creation is primarily driven by the linear Breit-Wheeler process ($γγ\to e^+ e^-$), not the nonlinear process assumed to be dominant at high intensity, because of the high density of $γ$ rays emitted inside the target. The favorable scaling with laser intensity of the linear process prompts reconsideration of its neglect in simulation studies, but also permits positron jet formation at intensities that are already experimentally feasible. Simulations show that the positrons, confined by a quasistatic plasma magnetic field, may be accelerated by the lasers to energies $> 200$ MeV.
