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Prof. Tongpu Yu
Visiting Professor at University of Strathclyde
The Breit-Wheeler (BW) process can be triggered by high power lasers. 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 1022W/cm2. In this scheme, bright ɣ-rays are generated by radiation trapped electrons oscillating in the laser fields. The dense ɣ -photons then collide with the focused counter-propagating lasers to initiate the multi-photon Breit-Wheeler process. Full three-dimensional particle-in-cell simulations with QED incorporated indicate that one may generate a high-yield (1.05×1011) overdense (4×1022 cm3) 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.
 X.L. Zhu, T.P. Yu, et al., Nat. Commun. 7, 13686 (2016)
 X.L. Zhu, Y. Yin, T.P. Yu, et al., New J. Phys. 17, 053039 (2015)
 H.Z. Li, T.P. Yu, et al., submitted, (2017)
Slides of this talk will be available soon.