科研之友
微信
新浪微博
Facebook
分享链接
摘要
Pair production can be triggered by high-intensity lasers via the Breit-Wheeler process. However, the straightforward laser-laser colliding for copious numbers of pair creation requires light intensities several orders of magnitude higher than possible with the ongoing laser facilities. Despite the numerous proposed approaches, creating high-energy-density pair plasmas in laboratories is still challenging. Here we present an all-optical scheme for overdense pair production by two counter-propagating lasers irradiating near-critical-density plasmas at only similar to 10(22)Wcm(-2). In this scheme, bright g-rays are generated by radiation-trapped electrons oscillating in the laser fields. The dense g-photons then collide with the focused counter-propagating lasers to initiate the multi-photon Breit-Wheeler process. Particle-in-cell simulations indicate that one may generate a high-yield (1.05 x 10(11)) over-dense (4 x 10(22) cm(-3)) GeV positron beam using 10 PW scale lasers. Such a bright pair source has many practical applications and could be basis for future compact high-luminosity electron-positron colliders.
- 出版日期2016-12-14
- 单位上海交通大学; 南京大学; 中国人民解放军国防科学技术大学
