Center for Applied Physics and Technology, HEDPS, State Key Laboratory of Nuclear Physics and Technology, and School of Physics, Peking University, Beijing, 100871, China.
Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China.
Sci Rep. 2017 Mar 24;7:45031. doi: 10.1038/srep45031.
We show a new resonance acceleration scheme for generating ultradense relativistic electron bunches in helical motions and hence emitting brilliant vortical γ-ray pulses in the quantum electrodynamic (QED) regime of circularly-polarized (CP) laser-plasma interactions. Here the combined effects of the radiation reaction recoil force and the self-generated magnetic fields result in not only trapping of a great amount of electrons in laser-produced plasma channel, but also significant broadening of the resonance bandwidth between laser frequency and that of electron betatron oscillation in the channel, which eventually leads to formation of the ultradense electron bunch under resonant helical motion in CP laser fields. Three-dimensional PIC simulations show that a brilliant γ-ray pulse with unprecedented power of 6.7 PW and peak brightness of 10 photons/s/mm/mrad/0.1% BW (at 15 MeV) is emitted at laser intensity of 1.9 × 10 W/cm.
我们展示了一种新的共振加速方案，用于在螺旋运动中产生超密集相对论电子束，并在圆偏振（CP）激光等离子体相互作用的量子电动力学（QED）区域中发射出明亮的涡旋γ射线脉冲。在这里，辐射反冲力和自生磁场的综合效应不仅导致大量电子被捕获在激光产生的等离子体通道中，而且还导致激光频率和通道中电子迴旋振荡之间的共振带宽显著展宽，最终导致在 CP 激光场中形成超密集的共振螺旋运动电子束。三维 PIC 模拟显示，在激光强度为 1.9×10 W/cm 时，发出了一个前所未有的功率为 6.7PW、峰值亮度为 10 光子/s/mm/mrad/0.1%BW（在 15MeV 时）的明亮γ射线脉冲。
