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A clear channel to observe the creation of matters via gamma-gamma collider driven by10 PW laser pulses
来源: 日期2018-06-11 15:44 点击:

报告题目:A clear channel to observe the creation of matters via gamma-gamma collider driven by10 PW laser pulses

报告时间:2018年6月12日星期二16:30

报告地点: 仲英楼B253

报告摘要

Matter creation is one of the most basic processes in the universe. According to the quantum electrodynamics (QED) theory, matter can be created from pure light through the Breit Wheeler (BW) process. The multi-photon BW process (γ+nγ’→e++e-) has been demonstrated in 1997 at theSLAC, while the two-photon BW process (γ+γ’→e++e-) has never been observed in the laboratory. Interests have been aroused to demonstrate the two-photon BW process with laserowning to the developments of laser techniquesand laser accelerators. Proposals would work with the laser facilities such as NIF and ELI, provided that the signal-to-noise (S/N) ratio is high enough for detection. Here, a novel approach is proposed to demonstrate the two-photon BW process by using highly collimated and wide bandwidth γ-ray pulsesdriven by 10-PW lasers. Theoretical calculations show that more than 3.2×108positrons with a divergence angle of about 7 degrees can be created in a single shot, and the S/N is higher than 103. This approach, could provide the observation of two-photon interaction in the laboratory and important tests for fundamental QED theories, would pave the developments of QED, high-energy physics and laboratory astrophysics.

个人简介

余金清,男,北京大学博士后,2015年博士毕业于电子科技大学。2008-现在,先后在电子科技大学、中国工程物理研究院激光聚变研究中心、帝国理工学院(博士联培)、加州大学圣地亚哥分校(博士后)、北京大学(博士后)等单位学习和工作。已经发表研究论文30余篇,其中第一作者或者通信作者SCI论文12篇。研究兴趣主要包括:激光粒子加速、激光与物质相互作用产生高品质射线源、强场QED效应和全光对撞机。

 
 
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