Collimated Ultra-Bright Gamma-Rays from a PW-Laser-Driven Wire
Collimated Ultra-Bright Gamma-Rays from a PW-Laser-Driven Wire
复制标题
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
W.-M. Wang;Z. Sheng;P. Gibbon;L. Chen;Y. Li;J. Zhang
中科院分区：
文献类型：
--
作者：
W.-M. Wang;Z. Sheng;P. Gibbon;L. Chen;Y. Li;J. Zhang
三维QED粒子模拟结果表明，当2.5 PW和20 fs的激光脉冲沿着亚波长宽的固体导线传播时，可以有效地产生沿着导线表面的定向同步γ−射线。在脉冲能量转换为8%的情况下，γ−射线在10 fs持续时间内包含10个5到500 MeV的光子，对应于每0.1%带宽10个光子s mrad mm的峰值亮度。亮度和光子能量分别比同步辐射装置的最高值高2和3个数量级。辐射是由于产生nC，GeV的电子束以及引导沿着线表面和它们的摆动运动在强静电场和静磁场在高密度线表面诱导。特别是，这些准静态场是如此强大，以至于QED效应已经在γ射线辐射中发挥了重要作用。在目前可用的激光功率P0为0.5 PW ~ 5 PW的情况下，该方案可以稳健地产生峰值为1 μ m、发散角为几mrad的γ−射线，光子能量和光子数分别与P0和P3/2 0大致成比例。我们的方案包括两个优点的高方向性的基础上的激光韦克菲尔德加速和高电荷的基础上的激光-固体相互作用。PACS编号：52.38.Ph，52.38.- r，52.59.Px，41.75.Fr，52.65.Rr
It is shown by three-dimensional QED particle-in-cell simulation that as a laser pulse of 2.5 PW and 20 fs propagates along a sub-wavelength-wide solid wire, directional synchrotron γ−rays along the wire surface can be efficiently generated. With 8% energy conversion from the pulse, the γ−rays contains 10 photons between 5 and 500 MeV within 10 fs duration, corresponding to peak brilliance of 10 photons s mrad mm per 0.1% bandwidth. The brilliance and photon energy are respectively 2 and 3 orders of magnitude higher than the highest values of synchrotron radiation facilities. The radiation is attributed to the generation of nC, GeV electron beams well guided along the wire surface and their wiggling motion in strong electrostatic and magnetostatic fields induced at the high-density-wire surface. In particular, these quasistatic fields are so strong that QED effects already play a significant role for the γ−ray radiation. With the laser power P0 ranging from 0.5 PW to 5 PW available currently, this scheme can robustly produce γ−rays peaked at 1◦ with few-mrad divergence and the photon energy and number roughly scales with P0 and P 3/2 0 , respectively. Our scheme embraces both the merits of high directionality comparable to those based upon laser wakefield acceleration and high charge comparable to those based upon laser-solid interaction. PACS numbers: 52.38.Ph, 52.38.-r, 52.59.Px, 41.75.Fr, 52.65.Rr